GasMultiBloc
Combined regulation and safety valve Infinitely variable air/gas ratio control mode

MB-VEF 415 - 425 B01

Technical description
The DUNGS GasMultiBloc MB-VEF…B01 integrates filter, gas-air ratio controls, valves and pressure switches in one compact fitting:
- Dirt trap MB-VEF 415/420: pre-mount filter (microfilter) MB-VEF 425: sieve
- Solenoid valves up to 360 mbar (36 kPa) as per DIN EN 161 Class A Group 2
- Sensitive adjustment of gas and air pressure ratio
- Servo pressure regulator as per DIN EN 88-1 Class A Group 2; EN 12067-1
- High flow values at low pressure drop
- Ratio V = pBr / pL 0.75 : 1 ... 3 : 1
- Zero point correction N possible
- External pulse lines, pulse flange
- Interference degree N possible
- Flange connections with pipe threads as per ISO 7/1

The modular system permits individual solutions using valve proving system, min./max. pressure switch, pressure limiter.

Application
The gas-air ratio control enables the optimum mixture formation for forced air burners and premix burners; this applies to the modulating and two-stage variable operating modes. Suitable for gases of families 1, 2, 3 and other neutral gaseous media.

Approvals
EU type testing certificate as per:
• EU-Gas Appliances Regulation
• EU-Pressure Equipment Directive
Approvals in other important gas consuming countries.