The DUNGS MB-D(LE) 407–412 B07 MultiBloc combines multiple gas train functions into a single compact assembly. In addition to the standard filter, pressure regulator, and dual safety shut-off valves, the B07 version includes an integrated bypass valve (V3) with restrictor, allowing optimized gas flow during burner start-up and operation.
The system is designed for industrial and commercial gas burner applications where stable ignition, accurate pressure control, and safe gas shut-off are essential. The integrated bypass arrangement improves burner performance and combustion stability while reducing installation complexity.
Available in DN20, DN25, and DN32 sizes, the MB-D(LE) 407–412 B07 series supports inlet pressures up to 200 mbar and is compatible with DUNGS VPS 504 valve proving systems.
Key Features
Integrated gas train with bypass valve
One-stage gas control operation
Built-in microfilter with sieve
Adjustable gas pressure regulator
Dual automatic safety shut-off valves
Integrated bypass valve with restrictor
Compact and space-saving design
Reliable gas flow and pressure control
Enhanced burner ignition performance
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
Process Heating Equipment
Thermal Oil Heaters
Drying Systems
Combustion Systems
OEM Burner Manufacturing
Why Choose DUNGS MB-D(LE) 407–412 B07?
Integrated bypass valve for improved burner operation
Combines multiple gas train components in one unit
Reduces installation time and piping complexity
Improves ignition stability and combustion performance
Reliable gas pressure regulation
High operational safety
Compatible with burner safety monitoring systems
Trusted DUNGS gas control technology
Technical Description
The MB-D(LE) 407–412 B07 MultiBloc integrates filtration, pressure monitoring, pressure regulation, and gas shut-off functions into a compact assembly.
The system includes:
V1 = Double-seat safety valve
V2 = Single-seat or double-seat safety valve
V3 = Single-seat bypass valve with restrictor
Integrated microfilter
Optional gas pressure switch
Adjustable pressure regulator
The integrated bypass valve operates around V2 and the regulator to provide controlled gas flow during burner startup. The system supports inlet pressures up to 200 mbar and outlet pressure ranges of 4–20 mbar or 4–50 mbar.
Technical Specifications
Specification | Details |
|---|---|
Brand | DUNGS |
Series | MB-D(LE) 407–412 B07 |
Product Type | Gas MultiBloc |
Function | One-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 | Valve Configuration |
MB-D(LE) 407 B07 | DN20 | V2 Double-Seat Valve |
MB-D(LE) 410 B07 | DN25 | V2 Single-Seat Valve |
MB-D(LE) 412 B07 | DN32 | V2 Double-Seat Valve |
Main Components
Component | Function |
Filter (3) | Removes contaminants from gas flow |
Pressure Switch (4) | Monitors gas pressure |
Regulator (5) | Controls outlet gas pressure |
Valve V1 | Double-seat safety shut-off valve |
Valve V2 | Main safety shut-off valve |
Valve V3 | Integrated bypass valve with restrictor |
Available Versions
Version | Description |
MB | Standard MultiBloc |
MB-D | Main Volume Restrictor |
MB-LE | Adjustable Opening Behaviour |
MB-DLE | Combination of D and LE Functions |
