DUNGS Gas MultiBloc MB-ZR: Gas Valve Train, Regulator, Filter and Pressure Switch

1. Introduction

The DUNGS GasMultiBloc® MB-ZR is a compact gas safety and pressure regulation system designed for industrial and commercial combustion equipment. It combines several essential components of a burner gas train into a single compact assembly, including a fine-mesh gas filter, pressure regulator, safety shut-off valves, and pressure-switch connections.

This integrated design provides a practical solution for gas-fired equipment that requires reliable gas pressure control, automatic gas shut-off, and safe burner operation. By integrating multiple functions into one unit, the GasMultiBloc can help simplify gas-train installation while reducing the number of individual components, fittings, and pipe connections.

Applications of DUNGS GasMultiBloc MB-ZR

The DUNGS GasMultiBloc MB-ZR is designed for a wide range of gas-fired combustion, heating, and heat-generation applications where reliable gas pressure regulation, automatic safety shut-off, and controlled fuel supply are required.

Its compact design integrates essential gas-train functions, making it suitable for applications where installation space, system reliability, and simplified gas-train configuration are important.

Typical applications include:

Industrial Gas Burners – Used as an integrated component of the gas train for burners installed on industrial boilers, furnaces, ovens, dryers, and process-heating equipment.
Commercial Gas Burners – Suitable for commercial heating equipment requiring compact gas pressure regulation and safety shut-off valves.
Steam Boilers – Used in gas-fired steam boiler burner systems to regulate gas pressure and provide reliable gas shut-off during burner operation.
Hot Water Boilers – Supports controlled gas supply for burners used in industrial and commercial hot water generation systems.
Thermal Oil Heaters – Can be integrated into gas-fired thermal oil heater systems where stable gas pressure and reliable burner safety are required.
Industrial Furnaces – Suitable for gas-fired furnaces used in high-temperature heating, heat treatment, and industrial manufacturing processes.
Industrial Ovens – Can be used with gas burners for powder coating ovens, paint curing ovens, food-processing ovens, and other industrial heating chambers.
Industrial Dryers – Provides gas regulation and safety functions for burner systems used in drying equipment where stable heat input is important.
Heat-Generation Plants – Can serve as part of the gas train for industrial heat-generation equipment requiring integrated pressure regulation and automatic gas shut-off.
Industrial Heating Systems – Suitable for various gas-fired heating applications where a compact and reliable gas-train solution is required.

DUNGS GasMultiBloc for Industrial Burner Systems

In a typical industrial burner gas train, the DUNGS GasMultiBloc MB-ZR is installed between the gas supply and the burner. It integrates several important gas-control functions into a compact assembly, helping simplify the overall gas-train configuration.

A simplified gas flow arrangement is:

Gas Supply → DUNGS GasMultiBloc → Burner → Combustion Chamber

Inside the GasMultiBloc, the gas can pass through the integrated fine-mesh filter, pressure regulator, and safety shut-off valves before reaching the burner. Depending on the selected configuration, additional components such as minimum/maximum gas pressure switches, measuring points, flow restrictors, valve-position monitoring, and other safety accessories can also be incorporated.

For a two-stage burner, the valve configuration can be selected according to the required gas-flow characteristics. Certain versions provide fast opening, while others provide slow opening with partial-volume and main-volume adjustment.

GasMultiBloc Selection

Selecting the correct DUNGS GasMultiBloc MB-ZR requires more than simply matching the pipe connection size. The gas train must be properly matched to the burner capacity, fuel characteristics, gas pressure, required gas flow, electrical system, and burner operating sequence.

Key selection parameters include:

Burner Capacity – The burner heat input determines the required gas flow capacity of the GasMultiBloc.
Gas Type – Confirm whether the system uses natural gas, gaseous LPG, or another approved neutral gaseous medium.
Gas Inlet Pressure – Check the available pressure from the upstream gas supply to ensure it is within the permitted operating range.
Required Outlet Pressure – The regulator must be capable of delivering the gas pressure required by the burner at the required firing rate.
Gas Flow Rate – Both minimum and maximum gas consumption should be considered, particularly for two-stage or modulating burner applications.
Pipe Connection Size – The GasMultiBloc connection must match the existing gas-train piping and installation requirements.
Electrical Voltage – The solenoid valves and pressure switches must be compatible with the burner control panel’s electrical supply.
Valve Configuration – Select the appropriate fast-opening or slow-opening configuration according to the burner ignition and operating sequence.
Pressure Switch Configuration – Determine whether minimum, maximum, or other gas-pressure monitoring is required.
Burner Operating Mode – Check whether the burner operates ON/OFF, two-stage, or modulating, as this affects the required gas-train configuration.

Why Correct DUNGS GasMultiBloc Sizing Matters

Selecting the correct DUNGS GasMultiBloc MB-ZR is important to ensure reliable, stable, and safe operation of an industrial gas burner. The GasMultiBloc is not selected based solely on the pipe connection size. The complete burner gas train and combustion system must be evaluated.

An incorrectly selected GasMultiBloc may result in:

Excessive gas pressure drop
Insufficient gas flow
Unstable burner operation
Ignition problems
Incorrect burner firing rate
Pressure-regulation problems
Incompatibility with the burner control system
Increased difficulty during commissioning

The correct model should therefore be matched to the burner capacity, gas type, gas inlet pressure, required outlet pressure, gas flow rate, connection size, electrical voltage, pressure-switch configuration, and burner operating mode.

Important Information for Replacement

For DUNGS GasMultiBloc replacement, it is recommended to check the existing unit before ordering. The easiest way to identify a suitable replacement is to provide a clear photograph of the DUNGS nameplate or model number.

The following information should also be verified:

Existing DUNGS model number
Burner manufacturer and model
Burner capacity
Gas type
Gas inlet pressure
Required outlet pressure
Maximum gas consumption
Gas connection size
Electrical voltage
Valve configuration
Pressure-switch configuration
Burner operating mode

This information allows the replacement GasMultiBloc to be properly matched to the existing industrial burner and gas-train system, reducing the risk of compatibility problems during installation and commissioning.

DUNGS GasMultiBloc for Industrial Burner Gas Train

The DUNGS GasMultiBloc MB-ZR forms an important part of the gas supply and safety system between the gas source and the burner.

A typical arrangement can be represented as:

Gas Supply → DUNGS GasMultiBloc → Burner → Combustion Chamber

Depending on the selected configuration, the GasMultiBloc can combine functions such as gas filtration, pressure regulation, safety shut-off, pressure monitoring, and gas-flow adjustment.

The pressure regulator helps maintain the required downstream gas pressure, while the safety valves provide controlled gas shut-off according to the burner operating and safety sequence.

Different MB-ZR configurations can provide different valve opening characteristics, including fast-opening or slow-opening arrangements. Selected versions can also incorporate partial-volume and main-volume adjustment, making the system suitable for different burner operating requirements.

Application on Industrial Burners

The GasMultiBloc can be integrated into gas-fired equipment such as:

Industrial gas burners
Steam boilers
Hot water boilers
Thermal oil heaters
Industrial furnaces
Industrial ovens
Drying systems
Asphalt heating systems
Heat-generation plants
Other industrial heating equipment

For industrial applications, correct sizing and configuration are essential to achieve stable gas pressure, reliable burner operation, controlled ignition, and proper safety-system performance.

PT Indira Mitra Boiler – DUNGS GasMultiBloc

PT Indira Mitra Boiler supplies DUNGS GasMultiBloc MB-ZR, gas burner spare parts, and industrial combustion components for applications throughout Indonesia.

Our engineering team can assist with model identification, replacement selection, gas-train configuration, compatibility checking, and technical support for industrial boiler and burner systems.

For replacement inquiries, customers can send the DUNGS model number, burner model, gas type, gas pressure, burner capacity, and a clear photograph of the existing GasMultiBloc nameplate. This information will help determine the appropriate DUNGS GasMultiBloc MB-ZR configuration for the application.

2. What Is DUNGS GasMultiBloc?

The DUNGS GasMultiBloc® MB-ZR is a modular gas safety and pressure regulation system designed for industrial and commercial combustion equipment. It combines several essential gas-train components into a single compact assembly, helping simplify installation while providing controlled and reliable gas supply to the burner.

The GasMultiBloc can integrate the following functions:

Fine-mesh gas filter – Helps trap dirt and particles from the gas supply before they reach the downstream components.
Gas pressure regulator – Controls and maintains the required downstream gas pressure for the burner.
Safety valve V1 – Provides automatic gas shut-off as part of the burner safety system.
Safety valve V2 – Provides a second gas safety shut-off function with opening characteristics depending on the selected model.
Pressure-switch connection – Allows gas pressure monitoring using compatible pressure switches.
Measuring points – Provides access for checking gas pressure during installation, commissioning, and maintenance.
Main volume adjustment – Allows adjustment of the main gas-flow characteristic on applicable configurations.
Partial volume adjustment – Provides additional gas-flow adjustment during low-fire or ignition operation on selected models.
Optional accessories – The modular design allows additional safety and monitoring components to be incorporated according to the application.

Fast-Opening and Slow-Opening Configuration

One of the important features of the DUNGS GasMultiBloc MB-ZR is the availability of different valve-opening characteristics.

Depending on the selected configuration, V1 is a fast-closing safety valve, while V2 can be configured for fast or slow opening.

A fast-opening configuration allows gas flow to reach the required operating condition quickly. A slow-opening configuration provides a more controlled increase in gas flow, which can be useful during burner ignition and transition to normal firing.

For example, selected MB-ZR versions are available with fast-opening V2, while other versions incorporate slow-opening V2 with partial-volume and main-volume adjustment.

This modular configuration allows the GasMultiBloc to be matched to different burner requirements, including ON/OFF and two-stage gas burner systems.

How the GasMultiBloc Works

A simplified gas flow arrangement is:

Gas Supply → Filter → Pressure Regulator → Safety Valve V1 → Safety Valve V2 → Burner

The integrated filter helps protect the gas-control components from contamination. The regulator then adjusts the gas pressure to the required operating level, while the safety valves control the gas supply according to the burner safety sequence.

During burner startup, the gas valves are controlled by the burner management or control system. The selected valve configuration determines how quickly gas flow is established and, where applicable, how the gas flow is restricted during ignition or low-fire operation.

This makes the DUNGS GasMultiBloc MB-ZR suitable for industrial combustion systems where compact design, gas pressure regulation, safety shut-off, and controlled gas flow are required.

Typical applications include industrial gas burners, steam boilers, hot water boilers, thermal oil heaters, furnaces, ovens, dryers, and other gas-fired heating systems.

3. Main Function of the DUNGS GasMultiBloc

The main purpose of the DUNGS GasMultiBloc MB-ZR is to provide an integrated solution for gas safety, pressure regulation, filtration, and controlled gas supply in combustion systems.

In a typical gas-fired burner installation, the gas must pass through several control and safety components before reaching the burner. A simplified arrangement is:

Gas Supply → Filter → Pressure Regulation → Safety Shut-Off → Burner

The DUNGS GasMultiBloc combines several of these functions into one compact assembly. This helps reduce the number of separate components required in the burner gas train while providing a practical solution for industrial and commercial combustion applications.

Advantages of the Integrated GasMultiBloc

Using an integrated GasMultiBloc can provide several practical benefits:

Compact installation – Multiple gas-control functions are combined into one assembly.
Simplified piping – Fewer individual components and connections are required.
Reduced installation time – The compact configuration can simplify gas-train assembly.
Easier maintenance – Important gas-control components are concentrated in one unit.
Integrated pressure regulation – The regulator helps maintain the required burner gas pressure.
Reliable gas shut-off – Safety valves provide controlled interruption of the gas supply.
Flexible configuration – Different valve and accessory configurations can be selected according to the burner application.

4. Gas Filter / Dirt Trap

The DUNGS GasMultiBloc MB-ZR incorporates a fine-mesh sieve that functions as a gas filter or dirt trap.

The primary purpose of the filter is to help prevent foreign particles from entering the pressure regulator, solenoid valves, burner gas train, and downstream combustion equipment.

Contamination can enter a gas piping system during installation, maintenance, pipe modification, corrosion, or other mechanical processes. If particles reach sensitive valve or regulator components, they may affect valve movement, pressure regulation, or sealing performance.

The integrated filter therefore provides an important first stage of protection for the downstream gas-control system.

Filter Maintenance

The condition of the filter should be checked as part of the burner maintenance program. A contaminated filter can increase pressure loss and potentially affect the gas supply to the burner.

Maintenance should follow the applicable DUNGS manufacturer’s instructions and the requirements of the installed gas system.

Before carrying out maintenance, the gas supply must be safely isolated and the system handled by qualified personnel.

5. Gas Pressure Regulator

Another important component of the DUNGS GasMultiBloc MB-ZR is the integrated gas pressure regulator.

The regulator controls the downstream gas pressure supplied to the burner. Stable gas pressure is important because burner performance depends on the relationship between gas pressure, gas flow, combustion air, and burner adjustment.

If gas pressure is outside the required operating range, the burner may experience problems such as:

Unstable flame
Incorrect burner capacity
Ignition difficulties
Poor combustion adjustment
Excessive pressure drop
Insufficient gas flow

The GasMultiBloc pressure regulator uses a proportional regulating principle and is designed according to the applicable DIN EN 88 Class A Group 2 requirements for the relevant configuration.

The regulator is compensated for residual pressure and provides a leak-tight seal when the gas system is shut off through valve V1.

Pressure Adjustment

The required outlet pressure depends on the burner design and operating conditions. Therefore, the GasMultiBloc should not be adjusted based only on the available gas supply pressure.

When selecting the appropriate model, the following should be considered:

Gas type
Gas inlet pressure
Required outlet pressure
Burner capacity
Gas consumption
Regulator configuration
Burner operating mode

The setpoint spring is permanently installed in the specified configuration, so the required pressure range must be considered when selecting the correct GasMultiBloc model.

6. Safety Valve V1

The first main safety valve in the GasMultiBloc is designated V1.

V1 functions as a safety shut-off valve and is designed according to DIN EN 161 Class A Group 2 for the applicable product configuration.

Its primary function is to provide reliable interruption of the gas supply when the burner is stopped or when a safety condition requires the gas supply to be shut off.

V1 is specified with fast-closing characteristics, allowing the gas supply to be interrupted quickly when the safety system commands the valve to close.

V1 in the Burner Safety Sequence

In a typical burner system, V1 operates as part of the overall burner safety sequence.

A simplified sequence can be represented as:

Gas Pressure Check → Burner Start Command → Valve Control → Ignition → Flame Verification → Burner Operation

If the burner control system detects an unsafe condition, the gas valves are commanded to close.

Possible safety conditions can include:

Insufficient gas pressure
Excessive gas pressure
Flame failure
Burner-control fault
Air-pressure fault
Safety interlock activation
Emergency shutdown

The exact sequence depends on the burner management system, burner controller, pressure switches, flame safeguard system, and overall burner design.

V1 should therefore be considered as one component of the complete burner safety system rather than an independent burner controller.

Importance of V1 for Industrial Burners

For industrial burners, reliable gas shut-off is essential because the burner may operate at relatively high fuel input and under demanding production conditions.

The V1 safety valve provides an important layer of protection by controlling the gas supply according to the burner safety sequence.

Correct installation, wiring, testing, and commissioning are essential to ensure that the valve operates correctly within the complete gas-train system.

7. Safety Valve V2

The second main safety valve in the DUNGS GasMultiBloc MB-ZR is designated V2. Together with V1, this valve forms an important part of the gas safety system and controls the gas supply to the burner.

The opening characteristics of V2 depend on the specific GasMultiBloc configuration. Different versions are available to accommodate different burner ignition and operating requirements.

Typical configurations include:

GasMultiBloc Version	V2 Opening Characteristic	Volume Restriction
MB-ZR	Fast opening	No partial-volume restrictor
MB-ZRD	Fast opening	Partial and main volume restrictors
MB-ZRDLE	Slow opening	Partial and main volume restrictors
MB-ZRLE	Slow opening	Main volume restriction

This flexibility allows the DUNGS GasMultiBloc to be matched to different burner designs and gas-flow requirements.

For example, a burner requiring rapid gas establishment can use a fast-opening configuration, while an application requiring controlled ignition can use a slow-opening configuration.

The exact model should always be selected according to the burner manufacturer’s specifications, gas pressure, burner capacity, ignition sequence, and complete gas-train design.

8. Fast-Opening and Slow-Opening Gas Valves

The opening characteristic of the gas valve is particularly important during burner startup and ignition.

A fast-opening V2 allows the gas valve to reach its operating position quickly. This configuration may be suitable for burner systems where the required gas-flow characteristics can be established rapidly during the startup sequence.

A slow-opening V2, on the other hand, allows the gas flow to increase progressively. This provides greater control over the initial gas supply and can be useful for burners requiring a controlled ignition sequence.

A simplified comparison is:

Fast Opening

Valve Command → Rapid Gas Flow Increase → Burner Operation

Slow Opening

Valve Command → Controlled Gas Flow Increase → Ignition → Burner Operation

For industrial burners, controlled gas introduction during ignition can be an important part of the overall combustion-system design.

However, valve opening characteristics should not be selected independently. The correct configuration must be coordinated with the burner head, ignition system, combustion air, burner controller, flame safeguard system, and gas pressure.

9. Main Volume and Partial Volume Restrictor

Selected DUNGS GasMultiBloc MB-ZR configurations incorporate main volume and partial volume restrictors at valve V2.

These adjustment functions allow the gas-flow characteristics to be adapted to the requirements of the burner.

Partial Volume Adjustment

The partial volume setting is particularly relevant to the initial or low-fire stage of burner operation.

It can help control the amount of gas supplied during the initial opening of the valve, depending on the specific GasMultiBloc configuration.

This is useful for burner systems where the initial gas flow needs to be controlled before the burner transitions toward a higher firing rate.

Main Volume Adjustment

The main volume adjustment is associated with the higher or normal operating gas-flow range.

It can be used during burner commissioning to establish the required gas flow according to the burner manufacturer’s specifications.

The objective is to ensure that the burner receives the appropriate amount of fuel for the required heat input while maintaining suitable combustion conditions.

Importance of Proper Adjustment

Gas-flow adjustment should be performed by qualified combustion technicians using appropriate measuring and combustion-analysis equipment.

The adjustment should consider:

Gas pressure
Burner capacity
Gas consumption
Combustion air
Flame stability
O₂ level
CO level
Required firing rate
Burner manufacturer’s specifications

Incorrect gas-flow adjustment can affect burner performance and combustion safety. Therefore, the GasMultiBloc should be commissioned as part of the complete burner system.

10. Hydraulic Opening Delay

Selected DUNGS GasMultiBloc configurations incorporate a hydraulic opening-delay mechanism.

The purpose of the opening delay is to provide a more controlled increase in gas flow during burner startup.

Instead of allowing the valve to move immediately to its full operating position, the opening characteristic can provide a controlled transition during the ignition sequence.

A simplified operating concept is:

Burner Start → Valve Energized → Controlled Opening → Gas Flow Increases → Flame Establishment → Normal Operation

This can be particularly useful in burner applications where controlled gas introduction is required during ignition.

The actual opening behavior and adjustment range depend on the specific MB-ZR model and configuration. Therefore, the manufacturer’s technical documentation should be consulted before making any adjustment.

The hydraulic opening-delay function should also be considered together with the burner controller, ignition system, combustion air supply, and flame-monitoring system.

11. Pressure Switch Connection

The DUNGS GasMultiBloc MB-ZR provides connections for compatible gas pressure switches, allowing gas pressure to be monitored as part of the burner safety and control system.

Pressure switches can be used for several important functions, including:

Minimum gas pressure monitoring
Maximum gas pressure monitoring
Gas pressure safety
Burner interlock
Burner start permissive
Gas supply fault detection

A pressure switch monitors the gas pressure and changes its electrical contact condition when the pressure reaches the configured switching point.

The signal can then be connected to the burner control system or burner management system.

A simplified control sequence can be represented as:

Gas Pressure → Pressure Switch → Burner Control → Gas Valve → Burner

If the required gas-pressure condition is not satisfied, the burner control system can prevent burner startup or initiate a safety shutdown, depending on the system configuration.

Minimum Gas Pressure Monitoring

A minimum gas pressure switch can help ensure that sufficient gas pressure is available before the burner starts.

For example:

Gas Pressure Below Setpoint → Pressure Switch Activated → Burner Start Prevented

This can help prevent the burner from operating outside its required gas-supply conditions.

Maximum Gas Pressure Monitoring

A maximum gas pressure switch can provide an additional safety function by monitoring excessive gas pressure.

A simplified sequence is:

Gas Pressure Above Setpoint → Pressure Switch Activated → Burner Safety Shutdown

The exact sequence depends on the burner management system and safety architecture.

Pressure Switch Selection

The appropriate pressure switch should be selected according to the required:

Pressure range
Switching point
Gas type
Electrical characteristics
Connection configuration
Burner control system
Applicable safety requirements

For replacement applications, the existing DUNGS GasMultiBloc model and pressure-switch type should be checked carefully before ordering.

Correct pressure-switch configuration is essential because the pressure switch is part of the overall burner safety interlock system, not simply a pressure indicator.

12. Burner Pressure Monitoring

The DUNGS GasMultiBloc MB-ZR provides dedicated connections and measuring points for checking or monitoring gas pressure within the burner gas train. These measuring points are useful during installation, commissioning, troubleshooting, maintenance, and combustion adjustment.

Accurate gas-pressure measurement is important because burner performance depends on the relationship between gas pressure, gas flow, combustion air, and burner firing rate.

Technicians can use the designated measuring points to verify gas pressure at the relevant locations, depending on the GasMultiBloc configuration and installation arrangement.

Gas Pressure Measurement During Commissioning

During burner commissioning, technicians may check:

Gas inlet pressure
Regulated outlet pressure
Burner gas pressure
Gas pressure during ignition
Gas pressure at low fire
Gas pressure at high fire

A simplified arrangement is:

Gas Supply → DUNGS GasMultiBloc → Burner

By measuring the pressure at the appropriate points, technicians can determine whether the gas train is delivering the pressure required by the burner.

Gas Pressure Adjustment

Gas pressure measurements can also be used when adjusting the pressure regulator and gas-flow settings.

The objective is to achieve the gas pressure specified for the burner while maintaining stable combustion.

Gas pressure should be checked together with combustion parameters such as:

Oxygen (O₂)
Carbon monoxide (CO)
Flame stability
Burner firing rate
Combustion-air setting

Any adjustment should be performed by qualified personnel using suitable measuring instruments and following the burner manufacturer’s specifications.

Troubleshooting and Maintenance

Gas-pressure measuring points are also useful when diagnosing burner problems.

For example, abnormal burner operation may be associated with:

Low gas pressure
Excessive gas pressure
Pressure fluctuations
Filter restriction
Incorrect regulator adjustment
Gas-supply problems
Incorrect gas-train sizing

Comparing the measured pressure with the required burner pressure can help technicians identify whether the problem originates from the gas supply, regulator, gas valve, or burner system.

13. Modular Gas Safety System

One of the key advantages of the DUNGS GasMultiBloc MB-ZR is its modular design.

Instead of using the same configuration for every burner application, the gas train can be adapted using suitable accessories and components according to the required gas safety, pressure monitoring, burner control, and installation requirements.

Depending on the specific model and application, additional components may include:

Ignition gas valve
Additional externally controlled valves
Valve proving system
Minimum gas pressure switch
Maximum gas pressure switch
Pressure limiter
Limit switch
Closing stroke limiter
Valve-position monitoring
Regulator blocking for gaseous LPG applications

This modular approach allows the GasMultiBloc to be configured for different types of industrial gas burners, boilers, furnaces, ovens, thermal oil heaters, and other combustion equipment.

Flexible Gas Train Configuration

A typical gas safety system can be configured according to the required burner sequence:

Gas Supply → Filter → Pressure Regulation → Safety Valves → Pressure Monitoring → Burner

Additional safety devices can be incorporated where required by the burner design or applicable regulations.

This makes the GasMultiBloc particularly useful for industrial applications where the gas train needs to meet specific safety and control requirements.

The exact accessory configuration should always be verified against the specific DUNGS model, burner manufacturer’s requirements, and applicable local standards.

14. Valve Proving System

For applications requiring additional monitoring of gas safety valves, a valve proving system can be incorporated into the gas train where supported by the selected configuration.

A valve proving system is designed to check the tightness or sealing condition of the safety shut-off valves before the burner is permitted to operate.

A simplified sequence can be represented as:

Burner Start Command → Valve Tightness Check → Safety Verification → Burner Start

If the valve system does not satisfy the required tightness condition, the burner control system can prevent the burner from proceeding with the normal ignition sequence.

Why Valve Proving Is Important

Gas safety valves are critical components of an industrial burner gas train. A valve proving function provides an additional layer of monitoring by checking the condition of the safety shut-off valves.

This can be particularly relevant for:

High-capacity industrial burners
Industrial steam boilers
Large thermal oil heaters
Industrial furnaces
Industrial ovens
Process heating systems
Heat-generation plants

The exact valve-proving method, sequence, and required equipment depend on the burner management system, GasMultiBloc configuration, burner capacity, and applicable safety requirements.

Integration With Burner Management System

The valve proving system does not operate independently from the burner. It must be properly integrated with the burner management system or flame safeguard controller.

A typical concept is:

GasMultiBloc Safety Valves → Valve Proving → Burner Management System → Ignition Sequence

The burner control system determines whether the required safety conditions have been satisfied before allowing the burner to proceed.

For this reason, valve proving should be designed and commissioned as part of the complete burner gas train and safety system, rather than treated as a standalone component.

Engineering Verification

When adding or replacing a valve proving system, the following should be checked:

DUNGS GasMultiBloc model
Burner capacity
Gas type
Gas pressure
Safety-valve configuration
Burner management system
Required proving sequence
Pressure-switch configuration
Electrical supply
Applicable safety standards

Proper configuration helps ensure that the DUNGS GasMultiBloc MB-ZR operates correctly as part of the complete industrial burner safety system.

15. Applications of DUNGS GasMultiBloc MB-ZR

The DUNGS GasMultiBloc MB-ZR is designed for a wide range of gas-fired combustion and heating systems where reliable gas pressure regulation, safety shut-off, filtration, and controlled fuel supply are required.

Industrial Steam Boilers

The GasMultiBloc can be integrated into gas burner systems for industrial steam boilers. The integrated pressure regulator helps maintain the required gas pressure, while the safety valves provide controlled gas shut-off according to the burner safety sequence.

For boiler applications, proper selection should consider the burner capacity, gas consumption, inlet gas pressure, required burner gas pressure, and burner operating mode.

Hot Water Boilers

Gas-fired hot water boilers can use the GasMultiBloc as part of the burner gas train. The unit provides gas regulation and safety functions while maintaining a compact installation.

It can be applied to industrial heating systems where stable burner operation is required to maintain the desired hot-water temperature.

Thermal Oil Heaters

For gas-fired thermal oil heaters, the DUNGS GasMultiBloc can be installed as part of the burner gas train.

Stable gas pressure is important because the burner must provide consistent heat input to the thermal oil system. The GasMultiBloc can therefore form part of the gas regulation and safety system between the gas supply and burner.

Industrial Furnaces

Industrial furnaces require reliable combustion control because variations in gas supply can influence furnace temperature, heating performance, and process consistency.

The GasMultiBloc can be used with gas burners installed on heat-treatment furnaces, process furnaces, and other industrial combustion equipment.

Industrial Ovens

Gas burners used in industrial ovens can utilize the GasMultiBloc for controlled and safe gas supply.

Typical applications include:

Powder coating ovens
Paint curing ovens
Industrial heating ovens
Food-processing ovens
Process heating ovens

The appropriate GasMultiBloc configuration depends on the burner capacity and required gas-control sequence.

Industrial Dryers

Gas-fired industrial dryers can use the DUNGS GasMultiBloc as part of their burner gas train.

Stable gas pressure and controlled fuel flow are important for maintaining consistent drying temperatures and process conditions.

Applications can include:

Food dryers
Agricultural product dryers
Industrial material dryers
Wood dryers
Process dryers

Asphalt Heating Systems

Gas burners used in asphalt heating systems can also require integrated gas pressure regulation and safety shut-off.

The GasMultiBloc can be incorporated into the burner gas train for equipment such as asphalt heating systems, bitumen heating equipment, and other industrial thermal-processing applications.

Commercial Heating Systems

The GasMultiBloc can also be used in commercial gas-fired heating equipment where compact gas regulation and safety-valve integration are required.

The final model selection must always be based on the actual burner and gas-system specifications.

16. Gas Families and Media

The DUNGS GasMultiBloc MB-ZR is designed for use with gases of families 1, 2, and 3, as well as other neutral gaseous media, subject to the specifications and approval of the particular model.

For LPG applications, it is important to distinguish between gaseous-phase LPG and liquid LPG.

The GasMultiBloc is intended for the appropriate gaseous fuel application. Liquid hydrocarbons must not enter components that are not designed for liquid fuel, because they can damage sealing materials and affect reliable valve operation.

Therefore, the fuel supply system must be properly designed to ensure that the GasMultiBloc receives the fuel in the correct gaseous state.

Before installation, the fuel type and operating conditions should always be checked against the specific DUNGS model documentation.

17. Operating Temperature

The specified ambient operating temperature for the relevant GasMultiBloc configuration is approximately:

-15°C to +70°C

The actual permitted temperature range should be verified against the exact model and application.

Special consideration is required for LPG installations, particularly where low ambient temperatures can influence fuel behavior and system operation.

The installation environment should therefore be evaluated before selecting the GasMultiBloc.

Important factors include:

Ambient temperature
Burner-room temperature
Gas temperature
LPG application conditions
Installation location
Ventilation
Exposure to heat sources

The GasMultiBloc should be installed in an environment within the manufacturer’s specified operating limits.

18. Electrical Specifications

The standard electrical configuration for the relevant DUNGS GasMultiBloc models is:

Voltage: 220–230 V AC
Frequency: 50–60 Hz

Depending on the specific configuration, other electrical options may be available, including:

240 V AC
110–120 V AC
48 V DC
24–28 V DC

The actual electrical specification must always be verified from the GasMultiBloc model number and nameplate before installation or replacement.

Electrical Connection

The valves and pressure switches use plug-type electrical connections according to DIN EN 175301-803 for the applicable configuration.

Correct electrical voltage and connection are essential for reliable operation of the solenoid valves and associated pressure-monitoring devices.

When replacing an existing GasMultiBloc, technicians should verify:

Existing Voltage → New GasMultiBloc Voltage → Burner Control Panel

A mismatch in electrical specifications can prevent the valves from operating correctly or may result in equipment damage.

19. Protection and Construction

The DUNGS GasMultiBloc MB-ZR uses a compact construction intended for installation in gas-fired combustion equipment.

Typical construction characteristics include:

Protection: IP54 according to IEC 529 / EN 60529
Housing: Aluminium die casting
Valve-drive materials: Steel, brass, and aluminium
Sealing materials: NBR-based materials and silicone rubber
Solenoid drive: Electromagnetic actuator

The compact housing allows the GasMultiBloc to integrate multiple gas-train functions into a relatively small installation space.

This is particularly advantageous for industrial burners, boiler burner assemblies, furnace burners, ovens, and thermal oil heater packages, where the available gas-train installation space can be limited.

Compact Gas Train Design

A conventional gas train may require several separate components:

Filter → Regulator → Safety Valve → Safety Valve → Pressure Switch → Burner

With the appropriate DUNGS GasMultiBloc configuration, many of these functions can be incorporated into a single compact assembly:

Gas Supply → DUNGS GasMultiBloc → Burner

This integrated approach can simplify the mechanical arrangement while still allowing additional safety and monitoring accessories to be incorporated when required.

For replacement or new installation, however, the exact DUNGS model, gas pressure, burner capacity, fuel type, electrical specification, and required safety configuration must be verified before the unit is selected

20. Installation Position

The GasMultiBloc provides flexible installation positioning.

Depending on the specific model and installation requirements, the solenoid drive can be positioned vertically upward, horizontally, or at intermediate positions.

However, installation should always follow the applicable DUNGS installation instructions, burner manufacturer’s requirements, gas piping regulations, and local safety standards.

21. Nominal Connection Sizes

The MB-ZR series is available with different nominal connection configurations.

For the MB-ZR 405/407 B01, flange connections are available with pipe threads such as:

Rp 1/2 and Rp 3/4

For the MB-ZR 410/412 B01, configurations include:

Rp 3/4, Rp 1, and Rp 1 1/4

The actual connection configuration should be selected according to the burner gas-train piping and required gas flow.

22. Why Use DUNGS GasMultiBloc?

There are several reasons why an integrated gas valve train can be advantageous compared with assembling separate components.

Compact Design

The regulator, filter, and safety valves are integrated into one compact assembly.

Simplified Installation

Fewer separate components can help simplify the gas piping arrangement.

Integrated Safety

The safety shut-off valves and pressure-monitoring functions can be integrated into the burner gas train.

Flexible Configuration

The modular design allows additional components to be added according to the application.

Reduced Installation Space

The compact design is particularly useful for burner packages where installation space is limited.

Easier System Integration

The GasMultiBloc can be integrated with burner management systems and pressure-monitoring devices.

23. DUNGS GasMultiBloc for Burner Replacement

When replacing an existing gas valve train, it is important not to select a replacement only by comparing the physical dimensions.

The following information should be checked:

Existing DUNGS model
Gas type
Gas inlet pressure
Required outlet pressure
Burner capacity
Gas consumption
Connection size
Voltage
Valve configuration
Opening characteristic
Pressure-switch requirements
Installation orientation
Required accessories

For example, a burner operating with natural gas may require a different configuration from an LPG application.

Likewise, a modulating burner may require a different gas-flow arrangement from a simple ON/OFF burner.

24. DUNGS GasMultiBloc for Industrial Burners

The DUNGS GasMultiBloc MB-ZR is particularly useful for industrial burners because it combines several critical gas-control functions into a compact assembly.

A typical system can be arranged as:

Gas Supply → Gas Filter → Pressure Regulator → V1 → V2 → Burner

Pressure switches and measuring points can be incorporated into the gas train depending on the required safety configuration.

The burner management system controls the safety valves and verifies the required operating conditions before allowing combustion to begin.

25. Technical Selection

Selecting the correct GasMultiBloc requires more than choosing a connection size.

The most important parameter is often the required gas flow rate.

The gas flow requirement depends on:

Burner heat input
Fuel type
Gas calorific value
Gas pressure
Burner efficiency
Required combustion output

For example, a high-capacity industrial burner requires significantly greater gas flow than a small commercial burner.

The pressure drop through the GasMultiBloc should also be considered because excessive pressure loss can affect burner performance.

26. Maintenance

Regular maintenance of the GasMultiBloc is important for reliable burner operation.

Maintenance can include:

Checking gas connections
Inspecting the filter
Checking gas pressure
Inspecting pressure switches
Checking valve operation
Checking electrical connections
Checking valve tightness
Inspecting actuator operation
Verifying burner gas pressure

Any maintenance involving gas safety components should be performed by qualified personnel.

27. Troubleshooting

Common symptoms in a gas burner system may include:

Burner does not start

Possible causes include gas-pressure switch activation, incorrect electrical supply, safety interlock, valve-control problem, or insufficient gas pressure.

Burner starts but does not establish flame

Possible causes may include incorrect gas pressure, ignition problems, insufficient combustion air, incorrect valve settings, or burner adjustment issues.

Gas pressure is unstable

Possible causes can include regulator problems, incorrect pressure adjustment, insufficient upstream supply, contamination, or incorrect sizing.

Burner operates at insufficient capacity

Possible causes may include inadequate gas pressure, undersized gas train, excessive pressure drop, incorrect valve adjustment, or burner configuration problems.

Troubleshooting should be performed systematically and with appropriate gas-pressure and combustion measurements.

28. DUNGS GasMultiBloc and Burner Efficiency

The GasMultiBloc does not independently determine burner efficiency. However, stable gas pressure and correct gas-flow regulation are important components of a properly tuned combustion system.

When gas pressure is stable and the burner is correctly adjusted, the combustion system can operate more consistently.

For modulating burners, proper coordination between the gas valve, actuator, burner controller, combustion air system, and burner head is particularly important.

29. Safety Considerations

Gas combustion equipment must always be installed and commissioned by competent personnel.

Important safety considerations include:

Correct gas pressure
Correct gas-train sizing
Proper leak testing
Correct valve wiring
Pressure-switch verification
Burner safety interlocks
Correct combustion adjustment
Adequate ventilation
Appropriate emergency shut-off
Compliance with applicable regulations

Never bypass safety switches or modify safety components without proper engineering evaluation.

30. PT Indira Mitra Boiler – DUNGS GasMultiBloc Supply

PT Indira Mitra Boiler supplies DUNGS gas burner components and industrial combustion spare parts for boiler, burner, furnace, oven, dryer, thermal oil heater, and other heating applications in Indonesia.

The engineering team can assist in identifying the appropriate GasMultiBloc configuration based on:

Burner model
Burner capacity
Gas type
Gas inlet pressure
Required outlet pressure
Connection size
Electrical voltage
Valve configuration
Pressure-switch requirements

For replacement requirements, customers should provide the existing DUNGS model number, nameplate photograph, burner model, gas type, and available gas pressure.

This information helps determine the appropriate replacement and avoid compatibility problems during installation.

Conclusion

The DUNGS GasMultiBloc MB-ZR provides an integrated solution for gas filtration, pressure regulation, safety shut-off, and pressure monitoring in industrial and commercial combustion systems.

Its compact construction, modular configuration, different valve-opening characteristics, pressure-regulation function, and compatibility with additional safety accessories make it suitable for a wide range of gas-fired burners, steam boilers, hot water boilers, thermal oil heaters, furnaces, ovens, dryers, and industrial heating systems.

For a reliable installation, the GasMultiBloc should always be selected according to the burner capacity, gas type, gas pressure, required gas flow, connection size, voltage, valve configuration, and applicable safety requirements.

PT Indira Mitra Boiler can assist with DUNGS GasMultiBloc selection, replacement, burner gas-train configuration, spare parts, and technical support for industrial combustion applications in Indonesia.

Study Case: DUNGS GasMultiBloc MB-ZR for Industrial Gas Burner

A typical application of the DUNGS GasMultiBloc MB-ZR is the gas train of an industrial burner installed on a steam boiler, hot water boiler, thermal oil heater, furnace, or other gas-fired heating equipment.

In this type of application, the gas train must perform several important functions before natural gas or other approved gaseous fuel reaches the burner. These functions include gas filtration, pressure regulation, safety shut-off, gas pressure monitoring, and controlled gas flow during burner operation.

The DUNGS GasMultiBloc combines several of these functions into one compact assembly. DUNGS documentation describes the MB-ZR as a combined adjustment and safety unit, with configurations available for two-stage burner operation. The product family also provides connections for pressure switches and measuring points.

1. Application Background

An industrial boiler is equipped with a gas burner that requires a stable gas supply and reliable safety shut-off system.

The burner cannot simply be connected directly to the gas supply because the combustion system requires controlled gas pressure and safety devices between the gas source and burner.

A typical arrangement is:

Gas Supply → DUNGS GasMultiBloc → Burner → Combustion Chamber

The GasMultiBloc becomes an important part of the burner gas train because it combines the pressure regulation and safety functions required by the combustion system.

2. Problem to Be Solved

In an industrial heating system, several operating conditions must be controlled before the burner is allowed to operate.

The system needs to ensure that:

Gas pressure is within the required operating range.
Gas flow is controlled according to burner demand.
The gas supply can be shut off safely.
The burner receives the required gas pressure.
Gas pressure can be monitored.
The burner can operate according to its control sequence.
The gas train remains compact and practical to install.

Using separate components for each function can result in a larger gas-train arrangement with more connections and components.

The DUNGS GasMultiBloc MB-ZR provides an integrated alternative by combining several gas-control functions into a single fitting.

3. Gas Pressure Regulation

The first important function is gas pressure regulation.

The regulator maintains the downstream gas pressure at the required setpoint for the burner. Stable gas pressure is important because burner output depends on the relationship between gas pressure, gas flow, combustion air, and burner adjustment.

For example, if the burner requires a specific gas pressure at its inlet, the regulator can be adjusted according to the burner manufacturer’s specifications.

The MB-ZR documentation specifies pressure-regulator configurations and output-pressure ranges depending on the particular model. For the documented 405/407/410/412 series, the maximum operating pressure is specified at 360 mbar, while output-pressure ranges depend on the selected configuration.

4. Gas Safety Shut-Off

The GasMultiBloc also incorporates two main solenoid valves.

The first valve, V1, is specified as a safety valve according to DIN EN 161 Class A Group 2 and provides fast closing and fast opening characteristics.

The second valve, V2, is also part of the safety gas train and its opening characteristics depend on the selected MB-ZR configuration. Certain versions provide fast opening, while other versions provide slow opening.

This arrangement allows the gas supply to be controlled according to the burner safety sequence.

5. Two-Stage Burner Application

For a two-stage gas burner, the GasMultiBloc can be configured to provide suitable gas-flow characteristics for low-fire and high-fire operation.

A typical sequence can be represented as:

Start → Ignition/Low Fire → Stage 1 → Stage 2 → Modulation/High Fire

The exact sequence depends on the burner management system.

For applications requiring controlled opening, versions such as MB-ZRDLE provide a slow-opening V2 together with partial-volume and main-volume restriction functions. DUNGS lists the MB-ZRD(LE) 405–412 B01 as a GasMultiBloc combination for adjustment and safety with two-stage operation.

6. Why Slow Opening Can Be Important

During burner ignition, uncontrolled gas-flow increase can affect the ignition process.

A slow-opening configuration allows gas flow to increase progressively according to the valve adjustment and burner sequence.

This is particularly useful where the burner requires a controlled transition from ignition to operating capacity.

However, the appropriate valve configuration must always be selected according to the burner manufacturer’s specifications and the complete combustion-control system.

7. Pressure Switch Integration

The GasMultiBloc can also be equipped with suitable gas pressure switches.

Pressure switches can be used to monitor conditions such as minimum or maximum gas pressure.

A simplified safety sequence can be represented as:

Gas Pressure Check → Burner Start Permissive → Safety Valve Energized → Ignition → Flame Verification → Burner Operation

If the required gas-pressure condition is not satisfied, the burner control system can prevent burner operation according to the configured safety sequence.

DUNGS documentation identifies compatible pressure-switch types and provides mounting options for pressure monitoring.

8. Gas Filter Function

The GasMultiBloc incorporates a fine-mesh filter/dirt trap to help prevent contaminants from reaching the regulator and valves.

This is important because gas piping may contain particles originating from installation work, corrosion, or other contamination.

A contaminated valve or regulator can potentially affect gas-flow performance and sealing. Regular inspection and maintenance of the filter should therefore form part of the burner maintenance program.

9. Example Industrial Burner Configuration

Consider an industrial steam boiler equipped with a gas burner.

The simplified system can be arranged as:

Natural Gas Supply

↓

Manual Isolation Valve

↓

Gas Filter / Dirt Trap

↓

DUNGS GasMultiBloc MB-ZR

↓

Gas Pressure Monitoring

↓

Burner

↓

Combustion Chamber

The GasMultiBloc performs the integrated regulation and safety functions, while the burner management system controls the operating sequence.

10. Application on a Steam Boiler

In a steam boiler application, the burner must respond to the boiler’s heat demand.

When steam demand increases, the burner may need to increase its firing rate. When demand decreases, burner output can be reduced.

For a two-stage burner, the operating sequence may alternate between low and high firing stages.

For a modulating burner, a separate burner controller and actuator system may continuously adjust the firing rate.

The DUNGS GasMultiBloc forms part of the gas-supply and safety system that ensures the burner receives gas under the required pressure and that the gas supply can be safely interrupted.

11. Application on a Thermal Oil Heater

Another suitable application is a gas-fired thermal oil heater.

Thermal oil heaters require stable heat input because the process temperature must be maintained within a defined operating range.

The burner gas train can use a DUNGS GasMultiBloc to regulate gas pressure and provide safety shut-off.

The overall system can be represented as:

Thermal Oil Temperature Sensor → Burner Controller → Burner → DUNGS Gas Train

The exact control arrangement depends on the burner and thermal oil heater design.

12. Application on Industrial Furnace and Oven

Industrial furnaces and ovens may require continuous or staged burner operation.

The DUNGS GasMultiBloc can be used as part of the gas train where the burner requires integrated pressure regulation and safety shut-off.

Typical applications include:

Powder coating ovens
Paint curing ovens
Industrial drying ovens
Heat-treatment furnaces
Food-processing ovens
Process heating furnaces

Stable gas pressure helps maintain predictable burner performance, while the safety valves provide the required gas shut-off function.

13. Technical Considerations

When selecting a DUNGS GasMultiBloc, the following parameters should be checked:

Gas Type
Natural gas, LPG in gaseous phase, or another approved gaseous medium.

Burner Capacity
The GasMultiBloc must be suitable for the required gas flow.

Gas Inlet Pressure
The available gas pressure must be within the permitted operating range.

Required Outlet Pressure
The regulator must provide the pressure required by the burner.

Connection Size
The connection must match the burner gas-train piping.

Electrical Voltage
The solenoid-valve voltage must match the burner control panel.

Valve Configuration
Fast-opening or slow-opening configuration should be selected according to the burner sequence.

Pressure Switch
Minimum/maximum pressure monitoring requirements must be considered.

DUNGS documentation for the MB-ZR series lists connection sizes, operating pressure, output-pressure ranges, pressure-switch options, voltage, and other technical parameters for the relevant models.

14. Example of Replacement Case

Another common situation is replacement of an existing gas valve train.

For example, an industrial burner may experience a failure of its existing gas regulator or safety valve assembly. Instead of replacing individual components without checking compatibility, the complete gas-train configuration should first be identified.

The technician should record:

Existing DUNGS model
Burner model
Burner capacity
Gas type
Gas inlet pressure
Required outlet pressure
Pipe connection
Electrical voltage
Pressure-switch configuration
Valve opening characteristic

A photograph of the existing nameplate is also useful for identifying the correct model.

15. Engineering Verification

The correct GasMultiBloc should not be selected only from the pipe diameter.

For example, two gas trains may have the same connection size but different regulator pressure ranges, valve configurations, or electrical specifications.

The engineering check should therefore consider the complete burner system.

The basic selection process can be summarized as:

Burner Capacity

↓

Gas Consumption

↓

Gas Pressure

↓

Required Outlet Pressure

↓

GasMultiBloc Model

↓

Pressure Switch & Accessories

↓

Commissioning

16. Commissioning

After installation, the gas train must be checked and commissioned according to the applicable manufacturer’s instructions and safety requirements.

Important checks include:

Gas-tightness testing
Inlet gas pressure
Outlet gas pressure
Pressure-switch operation
Safety-valve operation
Burner ignition
Gas-flow adjustment
Combustion adjustment
Safety interlock operation

Combustion should be checked using appropriate combustion-analysis equipment.

The objective is not simply to make the burner ignite, but to ensure that the complete system operates safely and within the required combustion parameters.

17. Result of the Application

When correctly selected and installed, the DUNGS GasMultiBloc MB-ZR can provide several practical benefits to an industrial gas burner system:

Integrated gas-pressure regulation
Integrated safety shut-off valves
Compact gas-train arrangement
Gas filtration
Pressure-monitoring capability
Flexible valve configurations
Easier integration with burner control systems
Reduced number of separate components

DUNGS documentation confirms that the GasMultiBloc family is designed as a modular system for gas safety and regulator engineering, with configurations suitable for gases of families 1, 2, and 3 and other neutral gaseous media.

Conclusion

The DUNGS GasMultiBloc MB-ZR is a practical solution for industrial burner gas trains where gas pressure regulation, safety shut-off, filtration, and pressure monitoring need to be integrated into a compact assembly.

Its application can be found in steam boilers, hot water boilers, thermal oil heaters, industrial furnaces, ovens, dryers, and other gas-fired heating systems.

The most important point in selecting a GasMultiBloc is to match the unit with the complete burner system. Burner capacity, gas type, inlet pressure, outlet pressure, connection size, electrical voltage, valve configuration, and pressure-switch requirements should all be evaluated before installation.

PT Indira Mitra Boiler can assist with DUNGS GasMultiBloc selection, replacement, gas burner spare parts, gas train configuration, and technical support for industrial boiler and burner applications in Indonesia.

Workshop

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PT Indira Mitra Boiler
Ratman Bejo
☎️081388666204

My Website
https://indira.co.id

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