Energy Combustion

The DUNGS DMV (Double Modular Valve) series is a highly integrated gas safety component that combines two independent automatic shut-off valves into one compact housing. It is the industry standard for industrial and commercial gas trains because it replaces two separate valves, reducing space, cost, and potential leak points.

1. Model Variants (Nomenclature)

The DMV series is defined by the opening behavior of its two internal valves (V1 and V2):

• DMV-D: Both valves are Fast-opening ($< 1$ s) and Fast-closing ($< 1$ s).

• DMV-DLE: Valve 1 is Fast-opening; Valve 2 is Slow-opening (approx. 20 s) with an adjustable fast stroke. This is ideal for "soft-start" ignition.

• DMV-D.../11: The "/11" indicates the latest design generation, featuring improved solenoids and modular mounting points for accessories.

2. Core Specifications & Series Sizes

The DMV is a "flangeless" valve body. You must use specific flange kits to match your pipe diameter.

3. Key Functional Features

• Main Volume Adjustment: On most DMV models, you can manually limit the total gas flow (throttle) by turning the adjustment screw on top of Valve 1.

• Fast Stroke (DLE only): On slow-opening models, you can set an "initial lift." This allows a burst of gas for ignition, followed by a slow ramp-up to full power.

• Proof of Closure (POC): Many industrial codes require POC. DMV valves can be fitted with a K01/1 switch that monitors the physical position of the valve seat.

• Modular Accessories: The valve body features "side taps" (test points) that allow you to bolt on pressure switches (GW A5) or a valve proving system (VPS 504) without extra piping.

4. Technical Data

• Protection Rating: IP54 (Standard).

• Voltage: 230V AC, 120V AC, or 24V DC.

• Duty Cycle: 100% (Continuous operation).

• Ambient Temperature: -15 °C to +60 °C.

• Materials: Housing made of aluminum and steel; seals made of NBR (nitrile rubber).

5. Maintenance & Troubleshooting

• Dirty Sieve: There is an internal 23-mesh sieve at the inlet. If you notice a pressure drop, this sieve likely needs cleaning.

• Coil Failure: If a valve fails to open, you can replace the solenoid coil without removing the valve body from the gas line.

• Leakage: If the valve fails a leak test, it usually indicates debris on the valve seat. For safety reasons, seat repairs are generally not field-serviceable; the valve block is typically replaced.

The DUNGS MVDLE 207/5 is a single-stage, normally closed, automatic shut-off valve designed for industrial and commercial gas burners. The "LE" designation stands for Slow Opening and Adjustable Fast Stroke, which is crucial for systems requiring a "soft start" to prevent pressure surges during ignition.

Technical Specifications Core Functions & Adjustments

The MVDLE 207/5 is highly adjustable to match the specific needs of your burner's ignition sequence:

1. Adjustable Fast Stroke: This allows the valve to jump quickly to a set "initial lift" (start gas volume) before the slow-opening phase begins. This ensures the burner ignites reliably without a massive "puff" of gas.

2. Slow Opening: The hydraulic brake allows for a gradual increase in gas flow, typically taking up to 20 seconds to reach full capacity.

3. Main Volume (Flow) Adjustment: On top of the valve, you can limit the maximum flow rate by turning the adjustment knob under the protective cap.

   • Clockwise (-): Decreases the gas flow.

   • Counter-clockwise (+): Increases the gas flow.

Installation & Wiring

• Mounting Position: The valve should be mounted with the solenoid coil vertically upright or up to 90° horizontal. It should never be mounted upside down.

• Electrical Connection: Most models use a standard 3-pin DIN plug (Type GDME) for easy replacement and maintenance.

• Gas Flow Direction: Always ensure the arrow on the valve body points in the direction of the gas flow.

Maintenance Checklist

• Internal Sieve: The 207/5 contains an internal 1mm mesh sieve. If you experience a drop in gas pressure at the burner, this sieve should be checked for debris or pipe scale.

• Replacement Coil: If the valve fails to open, the coil (typically Type 200) can be replaced without removing the valve from the gas line.

• Hydraulic Brake: If the valve opens instantly without the "slow" behavior, the hydraulic brake unit on top may have failed and requires replacement.

The DUNGS VPS 504 is an automatic Valve Proving System (VPS) designed to check the tightness of gas shut-off valves before every burner start or after every shutdown. It is most commonly used with the DUNGS DMV double solenoid valves and GasMultiBloc (MB) units.

1. How It Works (The Pressure Build-up Principle)

Unlike simple pressure switches, the VPS 504 has an internal motor pump.

1. Phase 1: It pumps gas from the inlet (upstream of Valve 1) into the space between the two safety valves.

2. Phase 2: It increases the pressure in that middle section by approximately 20 mbar above the inlet pressure.

3. Phase 3: It monitors this "test volume" for a set period (10 to 26 seconds).

   • If the pressure holds: The yellow "Run" LED lights up, and a contact is closed to allow the burner to start.

   • If the pressure drops: The red "Fault" LED lights up, and the system locks out the burner.

2. Technical Specifications 3. Model Differences

The series number indicates how the unit is connected electrically:

• S01: Includes a 7-pin plug-in connector (DIN 4791) for "plug-and-play" installation with many boilers.

• S02: Includes a DIN 43650 plug (like a solenoid valve plug). Often used in 230V or 24V DC configurations.

• S04: Features screw terminals inside the unit with a PG 13.5 cable gland (highest protection, IP54).

• S05: The 24V DC version for gas engines or mobile applications.

• S06: The 110–120V AC version specifically for the North American market.

4. Installation & Mounting

• Direct Mount: The VPS 504 mounts directly to the side of a DUNGS DMV or MB valve body. It comes with two O-rings that seal against the test ports on the valve.

• Orientation: It can be mounted horizontally or vertically, but never upside down (the motor pump cannot function properly in that position).

• Maintenance: It is a maintenance-free electronic device, but the internal filter (on the p1/p2 connections) should be inspected annually for clogging.

Safety Warning: If the VPS 504 goes into a red light (Fault) condition, do not simply reset it repeatedly. This indicates a physical leak in one of your safety valves (Valve 1 or Valve 2). The valves must be leak-tested manually before returning the system to service.

The DUNGS MB-ZRDLE series is a "GasMultiBloc" multifunctional gas control that serves as the "brain" and safety heart of a two-stage gas train. It consolidates several critical components into a single, compact aluminum housing, significantly reducing the footprint and potential leak points compared to a traditional piped gas train.

1. What the "MB-ZRDLE" Name Tells You

Each letter in the name signifies a specific function:

• MB (MultiBloc): An integrated unit containing a filter, pressure regulator, and two valves.

• ZR (Two-Stage): Designed for burners with two firing rates (Low Fire and High Fire). It has a specialized solenoid that can open to a partial position and then to a full position.

• D (Main Volume Restrictor): Allows you to manually throttle the maximum gas flow.

• LE (Slow Opening): Equipped with a hydraulic brake that causes Valve 2 to open slowly (approx. 20 seconds) for a "soft start" ignition.

2. Integrated Components

Inside a single MB-ZRDLE unit, you will find:

1. Fine-Mesh Sieve: A 0.8 mm internal filter that protects the regulator and valve seats from pipe scale and debris.

2. Pressure Regulator: A spring-loaded regulator that maintains constant outlet pressure regardless of inlet fluctuations.

3. Valve 1 (V1): A fast-opening, fast-closing safety shut-off valve.

4. Valve 2 (V2): A slow-opening, fast-closing safety shut-off valve that handles the two-stage modulation.

3. Key Adjustments

The MB-ZRDLE is highly customizable for specific burner profiles. Setting it up typically requires four adjustments:

4. Common Models in the Series

The size of the MultiBloc is determined by the flow requirements of the burner:

• MB-ZRDLE 405 / 407: Small units for package burners (Rp 1/2" – Rp 3/4").

• MB-ZRDLE 410 / 412: Medium units (Rp 3/4" – Rp 1 1/4").

• MB-ZRDLE 415 / 420: Large units (Rp 1 1/2" – Rp 2").

5. Maintenance and Safety

• Filter Inspection: The internal sieve should be checked annually. A clogged filter is the primary cause of a burner failing to reach "High Fire" or losing flame signal during the transition.

• Hydraulic Brake: If the valve snaps open instantly instead of ramping up slowly, the hydraulic fluid has likely leaked, and the brake head must be replaced.

• Valve Proving: These blocks are designed to have a DUNGS VPS 504 mounted directly to the side to automatically check the integrity of the valve seats before every start.

The DUNGS MB-DLE series is the standard "GasMultiBloc" for single-stage gas burners. It is a multifunctional power-house that combines all the necessary safety and regulation components of a gas train into one compact, modular unit.

The "LE" in the name is the defining feature: it stands for Slow Opening (with an adjustable Fast Stroke), which is essential for achieving a "soft start" during burner ignition.

1. Integrated Components

Instead of piping five different parts together, the MB-DLE includes:

1. Fine-Mesh Sieve: An internal 0.8 mm filter to trap debris.

2. Pressure Regulator: Stabilizes the gas pressure to the burner manifold.

3. Safety Valve 1 (V1): Fast-opening/fast-closing shut-off valve.

4. Safety Valve 2 (V2): Slow-opening/fast-closing shut-off valve (contains the hydraulic brake).

2. Functional Adjustments

The MB-DLE is highly tunable to ensure the burner lights smoothly without "booming" or flame lift-off.

3. Common Series Sizes

The number following "MB-DLE" indicates the physical size and flow capacity of the unit:

• 403 / 405 / 407: Small units (typically Rp 1/2" or Rp 3/4" flanges).

• 410 / 412: Medium units (typically Rp 3/4" to Rp 1-1/4" flanges).

• 415 / 420: Large units (typically Rp 1-1/2" to Rp 2" flanges).

• 425: Extra-large unit (DN 65 flanged connection).

4. Technical Specifications

• Max Operating Pressure: 360 mbar (Standard) or 500 mbar (High pressure).

• Protection Rating: IP54 (Dust and splash protected).

• Closing Time: Less than 1 second (Safety shutdown).

• Duty Cycle: 100% (Can stay energized indefinitely).

• Voltage: 230V AC, 120V AC, or 24V DC versions available.

5. Troubleshooting & Maintenance

• Dirty Filter: If the burner is "starving" for gas or the pressure drops significantly when the burner fires, the internal sieve is likely clogged.

• Hydraulic Brake Failure: If the valve snaps open instantly rather than slowly ramping up, the hydraulic brake on top of V2 has failed and needs replacement.

• Solenoid Coil: If the valve doesn't open at all but has power, the coil may be burnt out. You can replace the coil without removing the valve from the gas pipe.

the DUNGS DMV-D series consists of double solenoid valves that are Fast-Opening and Fast-Closing. Unlike the "DLE" versions, these valves snap open instantly (in less than 1 second), making them ideal for systems where the gas pressure is managed by a separate upstream regulator or where rapid response is required.

1. Model Breakdown (Nomenclature)

• DMV: Double Modular Valve (Two valves in one housing).

• D: Fast-opening, Fast-closing.

• .../11: Design generation (Standard for current models).

2. DMV-D Threaded Series (Compact Models)

These units use a flangeless body and require Rp (threaded) flanges for installation. They are rated for a max pressure of 500 mbar.

3. DMV-D Flanged Series (High Capacity)

Designed for heavy industrial use with DN flanged connections.

4. Technical Specifications (General)

• Closing Time: $< 1$ second.

• Opening Time: $< 1$ second.

• Main Volume Adjustment: Standard on Valve 1 (V1), allowing manual throttling of max flow.

• Sieve: Integrated 1mm mesh sieve included.

• Protection Rating: IP54.

• Voltage: 230V AC (Standard), 110V-120V AC, or 24V-28V DC.

• Ambient Temp: -15 °C to +60 °C.

5. Adjustments & Accessories

• Flow Throttling: The adjustment screw on top of V1 allows you to limit the maximum stroke, effectively acting as a manual butterfly valve.

• Direct Mounting: The body features "side taps" for G 1/8 ISO 228 threads, allowing you to bolt the following directly to the valve:

  • VPS 504: Valve Proving System (Leak tester).

  • GW A5 / GW A6: Gas pressure switches.

  • K01/1: Closed position indicator (Proof of Closure).

6. Comparison: DMV-D vs. DMV-DLE

If your burner experiences "hard starts" or explosions upon ignition, the DMV-D may be opening too fast. In those cases, the DMV-DLE (Slow-opening) version is used to ramp the gas up over 10–20 seconds.

The DUNGS MVD series (and its variants MVDLE) are single-stage, normally closed, automatic shut-off valves. Unlike the "MultiBloc" (which contains a regulator and filter), the MVD is a dedicated safety valve used in industrial gas trains.

1. MVD Series Model Variants

The suffix after "MVD" determines the opening behavior and flow control:

• MVD: Fast-opening ($<1$ s), Fast-closing ($<1$ s). Basic on/off safety valve.

• MVD.../5: Includes a manual Main Volume Restrictor (Throttle) to set maximum flow.

• MVDLE: Slow-opening (approx. 20 s) with an adjustable Fast Stroke. Used for soft-start ignition.

• MVDLE.../5: The most common version. Slow-opening + Fast stroke + Main volume throttle.

2. Model List & Specifications (Threaded Versions)

These valves are rated for a maximum operating pressure of 360 mbar (except the 220 model).

3. Model List & Specifications (Flanged Versions)

For larger industrial capacities, these valves use DN flange connections and are typically rated for 200 mbar to 500 mbar.

4. Key Functional Features

• Fast Stroke (LE Models Only): An internal adjustment allows the valve to "snap" open a few millimeters instantly to provide ignition gas before the slow-opening ramp begins.

• Main Volume Adjustment: On the "/5" models, the large knob on top of the solenoid allows you to limit the total gas flow manually.

• Closed Position Indicator: Many MVD valves can be fitted with a K01/1 switch to provide a "Proof of Closure" (POC) signal to the burner management system.

• Integrated Sieve: Includes a 1 mm mesh sieve to protect the valve seat from debris.

5. Technical Data (Standard)

• Closing Time: $< 1$ second.

• Voltage: 230V AC (Standard), 110V-120V AC, 24V-28V DC.

• Protection Rating: IP54 (Dust and splash-proof).

• Ambient Temp: -15 °C to +60 °C.

• Mounting: Solenoid must be vertically upright to 90° horizontal. Never upside down.

6. Common Spare Parts

• Replacement Coils: Coils are replaceable without breaking the gas line. For example, Magnet Type 200 (for 207/210) or Magnet Type 300 (for 215/220).

• Hydraulic Brake: For MVDLE models, the hydraulic unit on top can be replaced if the valve loses its "slow-opening" function.

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The DUNGS DMV-DLE 520/11 is a high-capacity dual modular safety shut-off valve commonly used in large industrial and commercial gas trains. It combines two normally closed solenoid valves into one compact housing, which simplifies installation by replacing two individual valves.

1. Key Operational Features

• Valve 1 (V1): Fast-opening and fast-closing ($< 1$ s). It is designed to act as the primary safety shut-off.

• Valve 2 (V2): Slow-opening (approx. 20 s) and fast-closing. The slow-opening feature allows for a "soft start," preventing pressure surges during burner ignition.

• Adjustable Fast Stroke: Despite being slow-opening, you can adjust a "fast stroke" section on V2. This allows the valve to jump quickly to a set initial gas volume (start gas) before continuing its slow opening to full capacity.

• Main Volume Adjustment: The maximum gas flow can be manually limited (throttled) using the adjustment on top of the valve.

2. Technical Specifications 3. Setup & Adjustments

The DMV-DLE 520 is highly customizable for specific burner requirements.

• Adjusting the Fast Stroke:

  1. Unscrew the small adjustment cap from the top of the hydraulic brake on V2.

  2. Invert the cap and use it as a tool to turn the internal screw.

  3. Turning Clockwise: Decreases the fast stroke (less initial gas).

  4. Turning Anti-clockwise: Increases the fast stroke (more initial gas).

• Main Volume (Flow) Adjustment: Use the large adjustment screw (usually located on the side or bottom of V1, depending on the specific sub-model) to limit the total gas flow to the burner.

4. Common Accessories

• Flanges: The valve body is "flangeless." You must purchase the appropriate Rp or NPT threaded flanges to connect it to your pipework.

• VPS 504: A Valve Proving System that can be mounted directly to the side of the DMV to automatically check for internal leaks between cycles.

• K01/1 Switch: A "Proof of Closure" (POC) switch that provides an electrical signal to the burner controller confirming the valve is physically closed.

 

The DUNGS MB-DLE series is categorized primarily by its flow capacity and connection size. All models in this series share the same core functionality: Filter, Regulator, and two Safety Valves (with Valve 2 being Slow-Opening).

Below is the specification list for the most common models in the series.

MB-DLE Series Model Specifications General Technical Data (All Models)

• Opening Time: Adjustable from 0 to 20 seconds.

• Closing Time: < 1 second.

• Protection Class: IP54 (Dust and splash water protected).

• Ambient Temperature: -15°C to +70°C.

• Media: Natural gas, propane, butane, air, and inert gases.

• Internal Sieve: 0.8 mm mesh.

• Duty Cycle: 100% ED (Continuous operation).

Understanding the Model Suffixes

When ordering or specifying an MBDLE, the suffix tells you the design generation and the pressure spring installed:

1. Design Generation (B01)

Most current units are labeled B01. This indicates that both Valve 1 and Valve 2 are controlled together by the same electrical signal (standard for single-stage burners).

2. Pressure Range (S20 vs. S50)

The spring inside the regulator determines your manifold pressure limit:

• S20 (or S2): Range of 4 to 20 mbar. Ideal for low-pressure residential or commercial gas lines.

• S50 (or S5): Range of 20 to 50 mbar. Used for higher burner manifold pressure requirements.

3. Voltage Options

Models are available in 230V AC (standard), 110–120V AC (common in North America), and 24V DC (often used for gas engines or safety-critical specialized systems).

Common Accessories

• Flanges: The MB-DLE is a "flangeless" body. You must select a flange kit (Rp or NPT) to match your pipe size.

• VPS 504: An automatic Valve Proving System that bolts to the side to check for internal leaks.

• GW A5/A6: Pressure switches that monitor minimum or maximum gas pressure, mounting directly to the side of the block.

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The DUNGS MVDLE 207/5 is a single-stage, normally closed safety shut-off valve designed for industrial and commercial gas burners. The "LE" designation stands for Slow Opening and Adjustable Fast Stroke, making it ideal for systems that require a gentle "soft start" ignition to prevent pressure spikes.

1.Key Technical Specifications 2. Functional Details

The MVDLE 207/5 is characterized by its high degree of adjustability, allowing for precise control of the gas flow during the start-up sequence:

• Slow Opening: The valve takes roughly 20 seconds to reach full open, which provides a gradual increase in gas volume.

• Fast Stroke: This allows the valve to jump immediately to a preset "start gas" volume before the slow-opening phase begins.

• Main Volume Adjustment: You can manually limit the total flow through the valve by turning the adjustment knob on top of the hydraulic brake.

•  Safety Status: It is a Class A, Group 2 valve according to EN 161 standards, ensuring high safety reliability for burner applications.

3. Installation and Adjustment Guide

For proper operation, the MVDLE 207/5 must be adjusted based on the specific burner requirements:

1. Main Flow Setting: Loosen the pan head screw on the adjustment cap. Turn the knob clockwise for less gas and counter-clockwise for more gas.

2. Initial Fast Stroke: Unscrew the small black cap on the very top of the hydraulic brake. Flip the cap over and use it as a tool to turn the internal screw.

   • Clockwise: Decreases the initial fast lift (less start gas).

   • Anti-clockwise: Increases the initial fast lift (more start gas).

3. Mounting Position: The solenoid should ideally be vertically upright, though it can be mounted up to 90° (horizontally). It should never be mounted upside down.

4. Common Spare Parts & Accessories

• Replacement Coil: The standard 230V coil for this model is Type 200 .

• Closed Position Signal Contact: The "/5" suffix in the name indicates that this valve can be fitted with the K01/1 signal contact to electronically monitor if the valve is physically closed.

• Valve Proving System: Can be paired with the VPS 504 for automatic leakage testing between burner cycles.

Maintenance Note: All DUNGS valves include an internal 1mm mesh sieve. If you experience a sudden loss in gas pressure, check this sieve for debris or pipe scale.

The DUNGS MB-DLE 410 B01 is a compact "GasMultiBloc" that combines a filter, a pressure regulator, and two safety shut-off valves into a single integrated unit. The "LE" designation indicates that Valve 2 is slow-opening with an adjustable fast stroke, making it the standard choice for single-stage burners that require a smooth, controlled ignition (soft start).

1. Key Technical Specifications 2. Functional Components

The MB-DLE 410 is designed to provide a complete gas train solution in one block:

• Filter Section: An internal fine-mesh sieve protects the regulator and valve seats from debris.

• Pressure Regulator: Maintains a constant outlet pressure regardless of inlet pressure fluctuations.

• Valve 1 (V1): A fast-opening, fast-closing safety valve.

• Valve 2 (V2): A slow-opening safety valve with a hydraulic brake and an adjustable fast stroke.

3. Setting Up the Adjustments

There are three primary adjustments on the MB-DLE 410 that must be set during commissioning:

A. Pressure Regulator (Output Pressure)

Located under a black protective cap on the regulator section.

• Increase (+): Turn clockwise.

• Decrease (-): Turn counter-clockwise.

B. Main Volume Restrictor (Maximum Flow)

Located on top of the Valve 2 (V2) solenoid. It limits the total amount of gas the valve can pass when fully open.

• Setting: Loosen the pan head screw on the adjustment cap and turn the knob.

C. Fast Stroke (Initial Lift)

This determines how much the valve "jumps" open instantly before the slow-opening ramp begins.

1. Unscrew the small black adjustment cap on the very top of the hydraulic brake.

2. Invert the cap and use it as a tool to turn the internal screw.

3. Clockwise: Decreases the fast stroke (less initial gas).

4. Counter-clockwise: Increases the fast stroke (more initial gas).

4. Common Accessories & Maintenance

• Flanges: The unit is "flangeless." You must use the Rp 1" or Rp 1 1/4" flange sets to connect it to your piping.

• Pressure Switch: Usually paired with a GW A5 or GW A6 pressure switch to monitor for "Low Gas" conditions.

• Filter Replacement: The filter is accessible by removing the side cover plates. It is recommended to check/replace the filter annually or if a significant pressure drop is observed.

• Replacement Solenoid: If the valve fails to open, the coil (typically Type 100/110) can be replaced without removing the valve from the gas line.

 

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DUNGS is a leading global manufacturer of gas safety and combustion controls. Their gas solenoid valves are critical components in industrial and commercial burner systems, serving as automatic shut-off valves to ensure the safe release or termination of gas flow.

Core Product Series

DUNGS categorizes its valves based on their speed of operation and internal configuration.

1. Single Solenoid Valves (MV, MVD, MVDLE)

These are single-stage, normally closed automatic shut-off valves.

• MV: Standard fast-opening, fast-closing valve (<1s).

• MVD: Fast-opening with a manual main volume adjustment (the "D" stands for "Drossel," or throttle). This allows you to limit the maximum flow rate.

• MVDLE: Slow-opening (approx. 20 s) with an adjustable fast-stroke section (the "L" for slow and "E" for adjustable). This is ideal for soft-start ignition.

2. Double Solenoid Valves (DMV)

The DMV series integrates two safety valves into a single, compact housing. This design replaces two individual valves in a "gas train," saving space and reducing leak points.

• DMV-D: Both valves are fast-opening.

• DMV-DLE: Valve 1 is fast-opening; Valve 2 is slow-opening with an adjustable fast stroke.

• Approvals: Commonly used in systems requiring "Proof of Closure" (POC) to verify the valves are physically closed before the burner starts.

3. GasMultiBloc (MB)

The MultiBloc is an all-in-one assembly that includes a filter, a pressure regulator, and two solenoid valves. It is the industry standard for modern boiler and burner systems.

• MB-DLE: Single-stage regulator and slow-opening valves.

• MB-ZRDLE: Two-stage (High/Low) operation for burners that require two different firing rates.

Technical Specifications

While specs vary by model, the typical range for DUNGS industrial valves includes:

• Max Operating Pressure: Up to 500 mbar (7 PSI) for standard models; high-pressure versions available up to 5 bar.

• Voltage Options: 230V AC (Standard), 110-120V AC, and 24V DC.

• Ambient Temperature: -15 °C to +60 °C.

• Protection Rating: Standard IP54 (IP65 available for harsh environments).

• Media: Suitable for Natural Gas, Propane, Butane, and Air. Special "SGN" versions are available for aggressive Biogas.

Maintenance & Troubleshooting

• Dirty Sieve: All valves have an internal strainer. If you notice a pressure drop, the sieve may be clogged with pipe scale or debris.

• Coil Failure: If the valve fails to open, check the solenoid coil for continuity. DUNGS coils are replaceable without breaking the gas seal.

• Leak Testing: Annual leakage tests are mandatory. This is often done using a VPS 504 (Valve Proving System), which mounts directly to the side of the valve body to check for internal seat leakage automatically.

 

The DUNGS DMV-D 507/11 is a high-performance Dual Modular Valve that integrates two normally closed solenoid valves into a single compact housing. The "D" in the model name stands for Fast Opening, meaning both valves open in less than one second when energized.

1. Full Technical Specifications 2. Key Design Features

• Dual Valve Safety: Both Valve 1 (V1) and Valve 2 (V2) are Class A, Group 2 automatic shut-off valves. They can be wired to operate independently or in parallel.

• Main Volume Adjustment: The valve includes a manual throttle for the main gas flow. On the DMV-D 507/11, this adjustment is located on Valve 1 (V1) (unlike the smaller 503 model where it is on V2).

• Modular Versatility: It is designed for "flange-on" accessories. You can mount pressure switches (GW...A5), valve proving systems (VPS 504), or ignition gas flanges directly to the valve body without additional piping.

3. Setup & Adjustments

To adjust the gas flow on the DMV-D 507/11:

1. Locate the adjustment screw on the top of the Valve 1 (V1) solenoid.

2. To Increase Flow (+): Turn the adjustment screw counter-clockwise.

3. To Decrease Flow (-): Turn the adjustment screw clockwise.

4. Once the desired flow is set, tighten the locking screw to prevent accidental changes due to vibration.

4. Comparison: DMV-D vs. DMV-DLE

If you see a similar model labeled DMV-DLE 507/11, the "LE" stands for Slow Opening. While the "D" version (this one) snaps open immediately, the "DLE" version takes about 20 seconds to open fully, which is often preferred for smoother burner ignition (soft start).

5. Maintenance & Spare Parts

• Flanges: Note that the valve body is sold separately from the connection flanges. You will need a set of Rp or NPT flanges (1/2", 3/4", or 1") to mount it to your gas line.

• Replacement Coil: If the valve fails to open, the solenoid coil can be replaced. The typical part number for a 230V coil is 213811 (Magnet No. 1111).

• Internal Sieve: If you notice a pressure drop, check the internal sieve for debris. It is located at the inlet of V1.

 

The DUNGS MB-DLE 410 B01 S20 (often referred to as the "S2") is a single-stage GasMultiBloc. It is an industry-standard component for medium-sized burners, integrating a filter, pressure regulator, and two safety shut-off valves into one unit.

The "S20" (or S2) suffix identifies the low-pressure outlet spring, designed for standard gas applications.

1. Technical Specifications 2. Key Components & Adjustments

The MB-DLE 410 S20 is designed for "Soft Start" operation. You can tune the way the burner ignites using three main adjustment points:

• Pressure Regulator: Located on the regulator block. Use a screwdriver to turn the setting screw under the protective cap to reach your desired manifold pressure (within the 4–20 mbar range).

• Main Volume Adjustment: This is the large knob/screw on top of Valve 2. It limits the total gas flow when the valve is fully open.

• Fast Stroke (Initial Lift): This is the most critical adjustment for smooth ignition. It allows the valve to "jump" open instantly for a split second before the slow ramp-up takes over.

  • To adjust: Remove the small black cap on the very top of the hydraulic brake, flip it over, and use it as a tool to turn the internal screw.

  • Clockwise: Decreases the initial gas burst.

  • Counter-clockwise: Increases the initial gas burst.

3. Comparison: S20 vs. S50

If you find that turning the regulator screw to its maximum still doesn't provide enough pressure for your burner, you may have the wrong spring:

• S20 (S2): 4 to 20 mbar.

• S50 (S5): 20 to 50 mbar.

4. Installation Accessories

Since the 410 body is a universal block, it requires specific flange kits to match your pipe size:

• Rp 3/4" Flange: Part No. 221061

• Rp 1" Flange: Part No. 221062

• Rp 1 1/4" Flange: Part No. 221063

5. Maintenance Tip

If the burner is failing to ignite or "starving" for gas at high fire, check the internal 0.8 mm sieve. On the 410 series, the filter is located behind the side plates of the inlet flange. A clogged filter will cause a significant pressure drop across the MultiBloc.

The DUNGS MB-ZRDLE 412 B01 is a multifunctional GasMultiBloc designed for two-stage burner operation. It integrates a filter, a pressure regulator, and two safety shut-off valves into a single compact unit.

The "ZR" designation is the key differentiator: it allows the burner to operate at a Partial Volume (Stage 1/Low Fire) and a Main Volume (Stage 2/High Fire).

1. Model Nomenclature & Suffixes

• MB: MultiBloc (Product family).

• ZR: Two-stage operation (Dual-load).

• D: Includes a Main Volume Restrictor (to limit max flow).

• LE: Slow opening behavior (Hydraulic brake for soft starts).

• 412: Nominal size (Typically uses Rp 1" or Rp 1 1/4" flanges).

• S20 / S50: Indicates the outlet pressure range (S20 = 4–20 mbar; S50 = 20–50 mbar).

2. Technical Specifications 3. Two-Stage Operational Logic

The MB-ZRDLE 412 allows for three distinct gas flow phases:

1. Ignition/Fast Stroke: A quick "jump" to a preset initial volume for reliable spark ignition.

2. Stage 1 (Partial Load): V2 opens partially to a set limit. This is often used for the "Low Fire" setting or warm-up phase.

3. Stage 2 (Full Load): When the second stage is energized, V2 opens completely to the main volume limit for "High Fire" operation.

4. Key Adjustments

Setting up a 412 requires adjusting four different parameters:

• Pressure Regulator: Set via the screw on the regulator section to establish the base gas pressure.

• Stage 1 (Partial Flow): Adjusted via the setting on the hydraulic brake of Valve 2. This limits how far the valve opens during the first stage.

• Stage 2 (Main Flow): Adjusted via the main volume restrictor (the large knob/screw on top) to set the maximum burner output.

• Fast Stroke: Adjusted by turning the internal screw under the small cap on the hydraulic brake to set the initial "jump."

5. Maintenance & Spare Parts

• Filter Element: The filter is located behind the side cover. It should be inspected annually. A clogged filter will result in a drop in outlet pressure.

• Replacement Coils: The solenoids can be replaced individually. For the 412, the 230V replacement coil for V2 is typically Type 100 or 110.

• Flange Kits: This unit requires Rp 1" (Part # 221061) or Rp 1 1/4" (Part # 221062) flanges for installation.

 

The DUNGS DMV (Double Modular Valve) series is a highly integrated gas safety component that combines two independent automatic shut-off valves into one compact housing. It is the industry standard for industrial and commercial gas trains because it replaces two separate valves, reducing space, cost, and potential leak points.

1. Model Variants (Nomenclature)

The DMV series is defined by the opening behavior of its two internal valves (V1 and V2):

• DMV-D: Both valves are Fast-opening ($< 1$ s) and Fast-closing ($< 1$ s).

• DMV-DLE: Valve 1 is Fast-opening; Valve 2 is Slow-opening (approx. 20 s) with an adjustable fast stroke. This is ideal for "soft-start" ignition.

• DMV-D.../11: The "/11" indicates the latest design generation, featuring improved solenoids and modular mounting points for accessories.

2. Core Specifications & Series Sizes

The DMV is a "flangeless" valve body. You must use specific flange kits to match your pipe diameter.

3. Key Functional Features

• Main Volume Adjustment: On most DMV models, you can manually limit the total gas flow (throttle) by turning the adjustment screw on top of Valve 1.

• Fast Stroke (DLE only): On slow-opening models, you can set an "initial lift." This allows a burst of gas for ignition, followed by a slow ramp-up to full power.

• Proof of Closure (POC): Many industrial codes require POC. DMV valves can be fitted with a K01/1 switch that monitors the physical position of the valve seat.

• Modular Accessories: The valve body features "side taps" (test points) that allow you to bolt on pressure switches (GW A5) or a valve proving system (VPS 504) without extra piping.

4. Technical Data

• Protection Rating: IP54 (Standard).

• Voltage: 230V AC, 120V AC, or 24V DC.

• Duty Cycle: 100% (Continuous operation).

• Ambient Temperature: -15 °C to +60 °C.

• Materials: Housing made of aluminum and steel; seals made of NBR (nitrile rubber).

5. Maintenance & Troubleshooting

• Dirty Sieve: There is an internal 23-mesh sieve at the inlet. If you notice a pressure drop, this sieve likely needs cleaning.

• Coil Failure: If a valve fails to open, you can replace the solenoid coil without removing the valve body from the gas line.

• Leakage: If the valve fails a leak test, it usually indicates debris on the valve seat. For safety reasons, seat repairs are generally not field-serviceable; the valve block is typically replaced.

The DUNGS MVD series is a line of single-stage, automatic safety shut-off valves. Unlike the "MultiBloc" series, which are integrated assemblies, the MVD is a dedicated solenoid valve. It is typically used as a primary or secondary safety valve in industrial gas trains for burners, boilers, and gas-consuming equipment.

1. Model Variations (Nomenclature)

The suffix determines the specific features of the valve:

• MVD: Fast-opening ($< 1$ second), Fast-closing ($< 1$ second). No flow adjustment.

• MVD/5: Fast-opening, Fast-closing. Includes a Main Volume Restrictor (manual throttle).

• MVDLE/5: Slow-opening (adjustable up to 20s), Fast-closing. Includes a Fast Stroke and Main Volume Restrictor. (The "LE" stands for Slow Opening).

2. Threaded MVD Models (Rp 3/8" to Rp 2")

These are compact valves used for smaller capacities. They are typically rated for 360 mbar (except the 220 model).

3. Flanged MVD Models (DN 20 to DN 150)

For high-capacity industrial applications, using DIN flanged connections.

4. Key Functional FeaturesMain Volume Adjustment (on /5 models)

The large adjustment knob on top of the solenoid coil allows you to limit the total gas flow. Turning it clockwise reduces the valve stroke, acting as a manual throttle.

Fast Stroke (on LE models)

On slow-opening valves, the "Fast Stroke" adjustment allows the valve to snap open by a small, adjustable amount (usually 10-20%) instantly. This provides immediate gas for the spark to catch before the hydraulic brake takes over to ramp the valve the rest of the way open.

5. Technical Data

• Voltage: 230V AC (Standard), 110V-120V AC, 24V-28V DC.

• Protection Rating: IP54.

• Ambient Temperature: -15 °C to +60 °C.

• Integrated Sieve: Includes a 1 mm mesh sieve to protect the seat from pipe scale.

• Mounting: Solenoid must be vertically upright or at a 90° horizontal angle. Never mount upside down.

6. Common Maintenance

• Coil Replacement: If the valve fails to open but has power, the coil is likely burnt. You can swap the magnet coil without removing the valve from the gas line.

• Hydraulic Brake: On MVDLE models, if the valve "snaps" open instantly instead of ramping up, the hydraulic brake fluid has likely leaked.

The DUNGS MB-ZRDLE is a high-performance GasMultiBloc designed specifically for two-stage (dual-load) burner operation. It integrates a filter, pressure regulator, and two safety shut-off valves into a single, compact.

The "ZR" designation is the core differentiator, allowing the burner to cycle between a Partial Load (Stage 1) and a Full Load (Stage 2).

1. Model Breakdown & Nomenclature

Each part of the model name specifies a critical function:

• MB: MultiBloc (The integrated assembly).

• ZR: Two-stage operation (Partial and Main gas volumes).

• D: Main volume restrictor (Throttles total flow).

• LE: Slow-opening (Adjustable ramp with a hydraulic brake for soft starts).

2. Series Model List & Specifications

The size of the MB-ZRDLE is selected based on the required flow rate and pipe diameter.

3. Integrated Components

Inside the block, the gas passes through several stages:

1. Fine-Mesh Sieve: A 0.8 mm internal filter protects the regulator and valve seats.

2. Pressure Regulator: A spring-loaded unit that maintains constant burner manifold pressure.

3. Valve 1 (V1): A fast-opening/fast-closing safety valve (Class A).

4. Valve 2 (V2): A slow-opening/fast-closing safety valve that handles the two-stage modulation.

4. Adjustments & Commissioning

The MB-ZRDLE features four primary adjustment points that must be tuned for the specific burner:

• Output Pressure: Adjusted via the regulator screw to set the base gas pressure.

• Stage 1 (Partial Volume): Located on the V2 solenoid head. It sets the "Low Fire" volume.

• Stage 2 (Main Volume): The large knob on top of V2 sets the "High Fire" or maximum capacity.

• Fast Stroke (Initial Lift): Adjusted via an internal screw under the small cap on the hydraulic brake. This provides the initial "jump" of gas for ignition.

5. Technical Data (Standard)

• Opening Time: Adjustable from 0 to 20 seconds.

• Closing Time: < 1 second.

• Protection Rating: IP54 (Splash-proof).

• Ambient Temperature: -15 °C to +70 °C.

• Voltage: 230V AC (Standard), 120V AC, or 24V DC.

• Duty Cycle: 100% (Continuous operation).

6. Common Accessories

• Flange Kits: The valves are "flangeless." You must buy Rp or NPT flanges separately to match your pipe size.

• VPS 504: An automatic Valve Proving System that bolts to the side to check for seat leakage.

• GW A5/A6: Gas pressure switches that monitor for low or high gas pressure conditions.

The DUNGS MB-ZRDLE 407 B01 is a compact "GasMultiBloc" designed for two-stage burner operation. It is the smallest of the threaded MultiBloc series that supports dual-load (Low Fire/High Fire) functionality.

It integrates a filter, a pressure regulator, and two safety shut-off valves into a single housing.

1. Key Technical Specifications 2. Functional Adjustments

The "ZRDLE" designation means this unit is highly adjustable to ensure a smooth transition between firing rates:

• Pressure Regulator: The base outlet pressure is set via the adjustment screw on the regulator body (typically under a blue or black plastic cap).

• Stage 1 (Partial Volume): Located on the Valve 2 solenoid. This sets the gas flow for the "Low Fire" or ignition phase.

• Stage 2 (Main Volume): The large adjustment screw on top of Valve 2 sets the maximum gas flow for "High Fire."

• Fast Stroke: Adjusted by the internal screw under the small cap on the hydraulic brake. This allows a quick burst of gas for the initial spark before the slow ramp-up begins.

3. Connection & Flanges

The MB 407 does not have threads on the valve body itself. You must use the appropriate flange kit to connect it to your pipe:

• Rp 1/2" Flange: Part No. 221060

• Rp 3/4" Flange: Part No. 221061

4. Comparison: 407 vs. 410/412

• Flow Rate: The 407 is designed for smaller boilers/burners (up to approx. 300–400 kW depending on gas type and pressure drop).

• Physical Size: It is significantly more compact than the 410 or 412, making it ideal for package burners with limited space.

5. Maintenance Checklist

• Integrated Filter: Contains a 0.8 mm mesh sieve. It is located behind the side cover plate. It should be checked annually; a clogged filter is the most common cause of the burner failing to reach high fire.

• Hydraulic Brake: If the valve "snaps" open instantly to full volume instead of ramping up slowly, the hydraulic brake has likely failed and the top unit should be replaced.

• Leak Testing: The MB 407 is pre-drilled to accept a VPS 504 Valve Proving System on the side for automatic leak detection.

The DUNGS MB-ZRDLE 407 B01 S20 is a two-stage GasMultiBloc designed for precise fuel control in small to medium-sized burners. The S20 suffix is a critical specification—it defines the outlet pressure range of the integrated pressure regulator.

1. The "S20" Specification

The S20 designation means the internal spring is designed for a low-pressure output:

• Adjustable Range: 4 to 20 mbar (approx. 1.6 to 8 inches of water column).

• Application: This is the standard range for most atmospheric and fan-assisted burners operating on low-pressure natural gas or LPG.

• Note: If your system requires a higher manifold pressure (e.g., 20–50 mbar), you would need the S50 version instead.

2. Technical Specifications 3. Adjusting the MB-ZRDLE 407 S20

Because this is a two-stage valve with a slow-opening feature, there are four adjustment points:

1. Pressure Regulator (S20): Located on the regulator block. Use a screwdriver to turn the setting screw under the protective cap. This sets your base burner pressure.

2. Stage 1 (Partial Volume): Located on the Valve 2 (V2) head. This sets the "Low Fire" gas volume.

3. Stage 2 (Main Volume): The main volume restrictor on top of the valve sets the "High Fire" limit.

4. Fast Stroke (Initial Lift): Sets the "jump" for ignition. Turn the screw under the small cap on the hydraulic brake.

4. Key Accessories

To install or maintain the MB 407 S20, you typically need:

• Flange Kit: Since the body is flangeless, you need the Rp 1/2" or Rp 3/4" mounting kit.

• Pressure Switch: A GW A5 or GW A6 is often mounted to the inlet port to monitor for low gas pressure.

• VPS 504: This unit is fully compatible with the VPS 504 Valve Proving System for automatic leak detection.

5. Troubleshooting: "Burner Won't Reach High Fire"

If you are using an S20 model and can't get enough pressure/flow:

• Check the Spring: Ensure you aren't trying to push the regulator beyond 20 mbar. If you are, you'll need the S50 version.

• Check the Filter: A dirty internal sieve is the #1 cause of pressure drops. Remove the side plate on the 407 to inspect the 0.8 mm mesh.

• Check the Stage 2 Signal: Ensure the solenoid for the second stage is actually receiving voltage from the burner controller.

The DUNGS MB-ZRDLE 410 B01 S20 is a multifunctional two-stage GasMultiBloc. It is most commonly found on medium-sized industrial and commercial burners (roughly 150 kW to 800 kW) where a "Low Fire" and "High Fire" sequence is required.

The S20 designation confirms this unit is intended for low-pressure applications, typically standard natural gas lines.

1. Technical Specifications 2. Functional Adjustments

Setting up an MB-ZRDLE 410 requires balancing four different settings to ensure the burner transitions smoothly between stages:

• Pressure Regulator (S20): Located on the regulator block. Use a screwdriver to set the base pressure between 4 and 20 mbar.

• Stage 1 (Partial Volume): This is set on the Valve 2 (V2) solenoid. It determines the gas flow for "Low Fire." It must be set higher than the minimum required for a stable flame but lower than high fire.

• Stage 2 (Main Volume): The large adjustment screw on top of V2. This limits the total gas flow for "High Fire" operation.

• Fast Stroke (Initial Lift): The internal screw under the small cap on the hydraulic brake. This sets the initial "jump" of gas to ensure the burner lights immediately when the spark occurs.

3. Connection Flanges

The 410 body is "flangeless." Depending on your pipe size, you will need one of the following flange kits:

• Rp 3/4" Flange: Part No. 221061

• Rp 1" Flange: Part No. 221062

• Rp 1 1/4" Flange: Part No. 221063

4. Common Troubleshooting

• "No High Fire": If the burner stays in low fire, first verify that the burner controller is sending 230V to the Stage 2 terminal on the solenoid plug. If voltage is present, check the internal 0.8 mm filter; a partial clog often allows enough gas for low fire but chokes the flow at high fire.

• "Hard Ignition": If the burner ignites with a "boom" or vibration, the Fast Stroke is likely set too high. Reduce the initial lift by turning the internal screw clockwise.

• "Instant Opening": If V2 snaps open immediately instead of ramping up over several seconds, the hydraulic brake has failed and the top unit needs replacement.

5. Maintenance Accessory

Because the MB-ZRDLE 410 is a two-stage valve, it is highly recommended to pair it with a DUNGS VPS 504. The 410 body is pre-drilled with ports to allow the VPS to bolt directly to the side, providing an automatic safety check of the valve seats before every burner start.

 

The DUNGS MB-DLE series is categorized primarily by its flow capacity and connection size. All models in this series share the same core functionality: Filter, Regulator, and two Safety Valves (with Valve 2 being Slow-Opening).

Below is the specification list for the most common models in the series.

MB-DLE Series Model Specifications General Technical Data (All Models)

• Opening Time: Adjustable from 0 to 20 seconds.

• Closing Time: < 1 second.

• Protection Class: IP54 (Dust and splash water protected).

• Ambient Temperature: -15°C to +70°C.

• Media: Natural gas, propane, butane, air, and inert gases.

• Internal Sieve: 0.8 mm mesh.

• Duty Cycle: 100% ED (Continuous operation).

Understanding the Model Suffixes

When ordering or specifying an MBDLE, the suffix tells you the design generation and the pressure spring installed:

1. Design Generation (B01)

Most current units are labeled B01. This indicates that both Valve 1 and Valve 2 are controlled together by the same electrical signal (standard for single-stage burners).

2. Pressure Range (S20 vs. S50)

The spring inside the regulator determines your manifold pressure limit:

• S20 (or S2): Range of 4 to 20 mbar. Ideal for low-pressure residential or commercial gas lines.

• S50 (or S5): Range of 20 to 50 mbar. Used for higher burner manifold pressure requirements.

3. Voltage Options

Models are available in 230V AC (standard), 110–120V AC (common in North America), and 24V DC (often used for gas engines or safety-critical specialized systems).

Common Accessories

• Flanges: The MB-DLE is a "flangeless" body. You must select a flange kit (Rp or NPT) to match your pipe size.

• VPS 504: An automatic Valve Proving System that bolts to the side to check for internal leaks.

• GW A5/A6: Pressure switches that monitor minimum or maximum gas pressure, mounting directly to the side of the block.

The DUNGS DMV (Double Modular Valve) series is a highly integrated gas safety component that combines two independent automatic shut-off valves into one compact housing. It is the industry standard for industrial and commercial gas trains because it replaces two separate valves, reducing space, cost, and potential leak points.

1. Model Variants (Nomenclature)

The DMV series is defined by the opening behavior of its two internal valves (V1 and V2):

• DMV-D: Both valves are Fast-opening ($< 1$ s) and Fast-closing ($< 1$ s).

• DMV-DLE: Valve 1 is Fast-opening; Valve 2 is Slow-opening (approx. 20 s) with an adjustable fast stroke. This is ideal for "soft-start" ignition.

• DMV-D.../11: The "/11" indicates the latest design generation, featuring improved solenoids and modular mounting points for accessories.

2. Core Specifications & Series Sizes

The DMV is a "flangeless" valve body. You must use specific flange kits to match your pipe diameter.

3. Key Functional Features

• Main Volume Adjustment: On most DMV models, you can manually limit the total gas flow (throttle) by turning the adjustment screw on top of Valve 1.

• Fast Stroke (DLE only): On slow-opening models, you can set an "initial lift." This allows a burst of gas for ignition, followed by a slow ramp-up to full power.

• Proof of Closure (POC): Many industrial codes require POC. DMV valves can be fitted with a K01/1 switch that monitors the physical position of the valve seat.

• Modular Accessories: The valve body features "side taps" (test points) that allow you to bolt on pressure switches (GW A5) or a valve proving system (VPS 504) without extra piping.

4. Technical Data

• Protection Rating: IP54 (Standard).

• Voltage: 230V AC, 120V AC, or 24V DC.

• Duty Cycle: 100% (Continuous operation).

• Ambient Temperature: -15 °C to +60 °C.

• Materials: Housing made of aluminum and steel; seals made of NBR (nitrile rubber).

5. Maintenance & Troubleshooting

• Dirty Sieve: There is an internal 23-mesh sieve at the inlet. If you notice a pressure drop, this sieve likely needs cleaning.

• Coil Failure: If a valve fails to open, you can replace the solenoid coil without removing the valve body from the gas line.

• Leakage: If the valve fails a leak test, it usually indicates debris on the valve seat. For safety reasons, seat repairs are generally not field-serviceable; the valve block is typically replaced.

The DUNGS DMV (Double Modular Valve) series is a highly integrated gas safety component that combines two independent automatic shut-off valves into one compact housing. It is the industry standard for industrial and commercial gas trains because it replaces two separate valves, reducing space, cost, and potential leak points.

1. Model Variants (Nomenclature)

The DMV series is defined by the opening behavior of its two internal valves (V1 and V2):

• DMV-D: Both valves are Fast-opening ($< 1$ s) and Fast-closing ($< 1$ s).

• DMV-DLE: Valve 1 is Fast-opening; Valve 2 is Slow-opening (approx. 20 s) with an adjustable fast stroke. This is ideal for "soft-start" ignition.

• DMV-D.../11: The "/11" indicates the latest design generation, featuring improved solenoids and modular mounting points for accessories.

2. Core Specifications & Series Sizes

The DMV is a "flangeless" valve body. You must use specific flange kits to match your pipe diameter.

3. Key Functional Features

• Main Volume Adjustment: On most DMV models, you can manually limit the total gas flow (throttle) by turning the adjustment screw on top of Valve 1.

• Fast Stroke (DLE only): On slow-opening models, you can set an "initial lift." This allows a burst of gas for ignition, followed by a slow ramp-up to full power.

• Proof of Closure (POC): Many industrial codes require POC. DMV valves can be fitted with a K01/1 switch that monitors the physical position of the valve seat.

• Modular Accessories: The valve body features "side taps" (test points) that allow you to bolt on pressure switches (GW A5) or a valve proving system (VPS 504) without extra piping.

4. Technical Data

• Protection Rating: IP54 (Standard).

• Voltage: 230V AC, 120V AC, or 24V DC.

• Duty Cycle: 100% (Continuous operation).

• Ambient Temperature: -15 °C to +60 °C.

• Materials: Housing made of aluminum and steel; seals made of NBR (nitrile rubber).

5. Maintenance & Troubleshooting

• Dirty Sieve: There is an internal 23-mesh sieve at the inlet. If you notice a pressure drop, this sieve likely needs cleaning.

• Coil Failure: If a valve fails to open, you can replace the solenoid coil without removing the valve body from the gas line.

• Leakage: If the valve fails a leak test, it usually indicates debris on the valve seat. For safety reasons, seat repairs are generally not field-serviceable; the valve block is typically replaced.

The DUNGS MVDLE 220/5 is a single-stage, normally closed, automatic safety shut-off valve. It is one of the larger threaded valves in the MVD series, designed for high-capacity industrial gas burners.

Like other "LE" models, it is slow-opening (to provide a smooth "soft start") and has an adjustable fast stroke (to provide immediate ignition gas).

1. Technical Specifications 2. Functional Adjustments

The MVDLE 220/5 features three distinct mechanical adjustments located on top of the valve head:

1. Main Volume Adjustment (Flow): Located at the very top. This limits the total amount of gas that can pass through the valve when it is fully open.

   • To decrease flow: Turn the adjustment knob clockwise.

2. Slow Opening Ramp: The internal hydraulic brake controls how long the valve takes to reach full open (up to 20s). This prevents pressure "shocks" in the gas line.

3. Fast Stroke (Initial Lift): This allows the valve to snap open a few millimeters instantly before the slow ramp takes over.

   • Adjustment: Remove the small black cap on top, flip it over, and use it to turn the internal screw.

   • Clockwise: Decreases the fast stroke.

   • Counter-clockwise: Increases the fast stroke.

3. Key Differences: MVDLE 220 vs. 207/210

• Pressure Rating: Because the 220 is a larger valve (2"), its maximum inlet pressure is 200 mbar, whereas the smaller 207 and 210 models are rated for 360 mbar.

• Coil Size: The 220 uses a significantly larger and more powerful solenoid coil (Magnet Type 300) to lift the heavier internal valve disc.

4. Installation & Accessories

• Mounting: The solenoid must be mounted vertically upright or at a maximum angle of 90° (horizontal). It must never be installed upside down.

• Sieve: It contains an integrated 1mm mesh sieve at the inlet to protect the valve seat.

• Closed Position Indicator: The "/5" suffix means it is prepared for the K01/1 switch, which provides a "Proof of Closure" (POC) signal to the burner controller.

• Valve Proving: It can be used with a VPS 504 leak-testing system if mounted in a double-valve string.

5. Spare Parts

• Replacement Coil (230V): Magnet Type 300 (Part No. 215161).

• Replacement Coil (120V): Magnet Type 300 (Part No. 221147).

• Hydraulic Brake: If the valve starts opening instantly (no slow ramp), the hydraulic brake unit on top likely needs replacement.

The DUNGS MB-ZRDLE 415 B01 S20 / S50 is a "GasMultiBloc" multifunctional gas control. It is an all-in-one unit that integrates a filter, pressure regulator, and two safety shut-off valves into a single compact housing.

The "ZR" designation is the most important part of this model number: it stands for Two-Stage Function, allowing the burner to operate at two different firing rates (e.g., Low Fire and High Fire).

1. Model Breakdown (Nomenclature)

• MB: MultiBloc (The product family).

• ZR: Two-stage operation with adjustable partial volume for the first stage.

• D: Includes a Main Volume Restrictor (to set maximum flow).

• LE: Adjustable opening behavior (Slow Opening for soft starts).

• 415: Nominal diameter DN 40 (typically uses 1-1/2" flanges).

• B01: Design generation and valve configuration (V1 and V2 controlled together).

• S20: Outlet pressure range of 4 to 20 mbar.

2. Technical Specifications 3. Key Functional Adjustments

Because this is a two-stage valve, it has more adjustment points than a standard unit:

• Stage 1 (Partial Volume): Adjusted via the setting on the hydraulic brake/solenoid. This determines the gas flow for the "low fire" or ignition stage.

• Stage 2 (Main Volume): Adjusted via the main volume restrictor. This sets the "high fire" or maximum output.

• Fast Stroke: You can adjust the initial "jump" of Valve 2. This allows a quick burst of gas for reliable ignition before the slow-opening ramp-up begins.

• Pressure Regulator: The output pressure is set using the adjustment screw on the regulator section (usually under a lead-sealable cap).

4. Installation & Accessories

• Flanges: The MB 415 requires Rp 1-1/2" or NPT 1-1/2" flanges for pipe connection.

• Pressure Switch: Usually comes equipped with a GW A5 or GW A6 pressure switch mounted on the inlet to monitor minimum gas pressure.

• Valve Proving (VPS): The valve body is designed to accept a DUNGS VPS 504, which automatically checks the valves for leaks before every burner start.

5. Maintenance Note

The MB-ZRDLE 415 features an integrated fine-mesh sieve (0.8 mm). Unlike smaller MultiBlocs where you can pull the filter out of the side, on the 415, you must typically dismount the unit or the inlet flange to replace the filter element if it becomes clogged.

Energy Combustion, Ahmedabad suppliers of Dungs make Gas Solenoid Valve and Multibloc

DUNGS is a leading global manufacturer of gas safety and combustion controls. Their gas solenoid valves are critical components in industrial and commercial burner systems, serving as automatic shut-off valves to ensure the safe release or termination of gas flow.

Core Product Series

DUNGS categorizes its valves based on their speed of operation and internal configuration.

1. Single Solenoid Valves (MV, MVD, MVDLE)

These are single-stage, normally closed automatic shut-off valves.

• MV: Standard fast-opening, fast-closing valve (<1s).

• MVD: Fast-opening with a manual main volume adjustment (the "D" stands for "Drossel," or throttle). This allows you to limit the maximum flow rate.

• MVDLE: Slow-opening (approx. 20 s) with an adjustable fast-stroke section (the "L" for slow and "E" for adjustable). This is ideal for soft-start ignition.

2. Double Solenoid Valves (DMV)

The DMV series integrates two safety valves into a single, compact housing. This design replaces two individual valves in a "gas train," saving space and reducing leak points.

• DMV-D: Both valves are fast-opening.

• DMV-DLE: Valve 1 is fast-opening; Valve 2 is slow-opening with an adjustable fast stroke.

• Approvals: Commonly used in systems requiring "Proof of Closure" (POC) to verify the valves are physically closed before the burner starts.

3. GasMultiBloc (MB)

The MultiBloc is an all-in-one assembly that includes a filter, a pressure regulator, and two solenoid valves. It is the industry standard for modern boiler and burner systems.

• MB-DLE: Single-stage regulator and slow-opening valves.

• MB-ZRDLE: Two-stage (High/Low) operation for burners that require two different firing rates.

Technical Specifications

While specs vary by model, the typical range for DUNGS industrial valves includes:

• Max Operating Pressure: Up to 500 mbar (7 PSI) for standard models; high-pressure versions available up to 5 bar.

• Voltage Options: 230V AC (Standard), 110-120V AC, and 24V DC.

• Ambient Temperature: -15 °C to +60 °C.

• Protection Rating: Standard IP54 (IP65 available for harsh environments).

• Media: Suitable for Natural Gas, Propane, Butane, and Air. Special "SGN" versions are available for aggressive Biogas.

Maintenance & Troubleshooting

• Dirty Sieve: All valves have an internal strainer. If you notice a pressure drop, the sieve may be clogged with pipe scale or debris.

• Coil Failure: If the valve fails to open, check the solenoid coil for continuity. DUNGS coils are replaceable without breaking the gas seal.

• Leak Testing: Annual leakage tests are mandatory. This is often done using a VPS 504 (Valve Proving System), which mounts directly to the side of the valve body to check for internal seat leakage automatically.

 

Energy Combustion,ahmedabad importer and suppliers of DUNGS brand Gas Solenoid Valve and Gas Multibloc.

All Model available ex stock with genuine prices.

The DUNGS GasMultiBloc® integrates filter, regulator, valves and pressure switches in one compact fitting.-

Dirt trap: microfilter- One regulator and two main valves: B01- Two valves are fast opening- One valve is fast opening, one valve is slow opening- Solenoid valves up to 200 mbar (20 kPa) as per DIN EN 161 Class A Group 2- Sensitive setting of output pressure by proportional regulator as per DIN EN 88 Class A Group 2- High flow rates with low pressure drop- DC solenoid drive interference degree N- Main volume restrictor at valve V2- Hydraulic opening delay-

Flange connections with pipe threads as per ISO 7/1- Simple mounting, compact, light-weightThe modular system permits individual solutions by using external ignition gas tap in connection with separately controlled valves, by adding a valve proving system,

mini/maxi pressure switches, pressure limiters, partial volume setting by closing stroke limiter at valve V2 and regulator blocking for liquid gas applications.

ApplicationThe modular system permits individual solutions in gas safety and regulator engineering.

Suitable for gases of families 1, 2, 3 and other neutral gaseous media.

Approvals EC type test approval as per EC Gas Appliance Directive:MB-...403/053 B01 CE-0085 AQ 0810Approvals in other important gas consuming countries.