The DUNGS MB-ZRD(LE) 407–412 B07 MultiBloc combines multiple gas train functions into a single compact assembly for two-stage burner applications. The unit integrates filtration, pressure monitoring, pressure regulation, safety shut-off valves, and an internal bypass valve with restrictor, reducing installation complexity while improving combustion control.
The integrated bypass valve (V3) provides controlled gas flow during the first stage of burner operation, enabling smooth ignition and improved flame stability. This makes the B07 version ideal for burners requiring two-stage operation and precise gas flow management.
Available in DN20, DN25, and DN32 sizes, the MB-ZRD(LE) 407–412 B07 supports inlet pressures up to 200 mbar and is compatible with DUNGS VPS 504 valve proving systems.
Key Features
Integrated two-stage gas control system
Built-in bypass valve with restrictor
Compact MultiBloc design
Integrated microfilter with sieve
Adjustable gas pressure regulator
Optional gas pressure switch
Dual automatic safety shut-off valves
Smooth burner ignition and flame stabilization
Precise gas flow control
VPS 504 valve proving system compatible
KO1/1 closed position signal contact compatible
Suitable for industrial and commercial burners
Applications
Industrial Gas Burners
Commercial Gas Burners
Steam Boilers
Hot Air Generators
Industrial Furnaces
Thermal Oil Heaters
Process Heating Systems
Drying Equipment
Combustion Systems
OEM Burner Manufacturing
Why Choose DUNGS MB-ZRD(LE) 407–412 B07?
Integrated bypass valve for improved burner startup
Reliable two-stage burner operation
Combines multiple gas train components into one unit
Reduces installation time and piping requirements
Improves combustion efficiency and flame stability
Accurate gas pressure regulation
High operational safety
Trusted DUNGS gas control technology
Technical Description
The MB-ZRD(LE) 407–412 B07 MultiBloc integrates all essential gas train functions into a compact assembly for two-stage burner systems.
The system includes:
V1 = Valve 1
V2 = Valve 2
V3 = Bypass Valve with Restrictor
Filter (4)
Optional Pressure Switch (5)
Pressure Regulator (6)
The integrated bypass valve allows controlled gas flow around the main valve and regulator during low-fire operation, providing smooth ignition and enhanced combustion control.
The unit supports outlet pressure ranges of 4–20 mbar and 4–50 mbar with inlet pressures up to 200 mbar.
Technical Specifications
Specification | Details |
|---|---|
Brand | DUNGS |
Series | MB-ZRD(LE) 407–412 B07 |
Product Type | Gas MultiBloc |
Function | Two-Stage Gas Control with Integrated Bypass Valve |
Nominal Sizes | DN20, DN25, DN32 |
Maximum Inlet Pressure | Up to 200 mbar |
Outlet Pressure Range | 4–20 mbar / 4–50 mbar |
Filter | Integrated Microfilter |
Pressure Switch | Optional |
Pressure Regulator | Integrated |
Bypass Valve | Integrated V3 with Restrictor |
Valve Proving System | VPS 504 Compatible |
Available Models
Model | Nominal Size |
|---|---|
MB-ZRD(LE) 407 B07 | DN20 |
MB-ZRD(LE) 410 B07 | DN25 |
MB-ZRD(LE) 412 B07 | DN32 |
Main Components
Component | Function |
|---|---|
Filter (4) | Removes contaminants from gas flow |
Pressure Switch (5) | Monitors gas pressure |
Regulator (6) | Controls outlet gas pressure |
Valve V1 | Primary Safety Shut-Off Valve |
Valve V2 | Secondary Safety Shut-Off Valve |
Valve V3 | Bypass Valve with Restrictor |
Available Versions
Version | Description |
|---|---|
MB-ZRD | Two-Stage with Partial Volume Setting |
MB-ZRDLE | Two-Stage with Partial Volume Setting & Adjustable Opening Behaviour |
MB-ZRLE | Two-Stage with Adjustable Opening Behaviour |
