Safety fittings for water supply in the
building technology sector Series 651mWNK

Rueckruf EN

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Safety valves with diaphragm made of gunmetal, angle type with threaded connections

651mWNK enlarged outlet (TÜV/CE)
Particularly in the case of valves which are employed in potable water installations, we do not accept any compromises regarding the materials used. Only the highest quality materials suitable and approved for potable water applications are used in these valves. These types of safety valves with diaphragm are installed in the cold water pipe before the hot water heater to protect it from inadmissible overpressure.

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For the protection of:

  • closed circuit water heaters for drinking water and process water according to TRD 721, DIN 4753 and DIN 1988 for temperatures up to max. 95°C.

The safety valve is installed in the cold water inlet of the hot water heater according to DIN 1988.


  • water heaters for potable and process water and -storage tanks

Safety valves are set and sealed at the factory.


TÜV Type test approval 532

EC type examination

Type approval ACS

TSG ZF001-2006

TR ZU 032/2013 - TR ZU 010/2011

TRD 721
DIN 4753
DIN 1988
PED 2014/68/EU

Suitable for
Warm water
1/2" - 1 1/4"
- 10°C to + 95°C
3,0 - 10 bar
Data sheet/Capacity table