TÜV/CE safety valves for heating and cooling
Series 651mHNK VA

Rueckruf EN

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Safety valves made of stainless steel, angle-type with threaded connections


  • Examples of use
  • Approvals
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For the protection of:

  • thermostatically protected closed-circuit water heating systems with flow temperatures of up to 120°C according to TRD 721, DIN 4751 and  DIN EN 12828.

Should the thermostatic limiting and control unit fail, the safety valve has to blow-off the total heating output of the boiler as hot water and steam. Thanks to the all-metal design these safety valves can also be installed in cases of high environmental or radiation temperatures.

  • heating systems for building technology- and industrial-applications
  • co-generation plants (CHP)

Safety valves are set and sealed at the factory.


TÜV Type test approval 516

EC type examination

TRD 721
DIN 4751 Part 2
DIN EN 12828
DIN EN ISO 4126-1
PED 2014/68/EU

Suitable for
Hot water
Stainless steel
- 10°C to + 120°C
2,5 bar and 3,0 bar
Data sheet/Capacity table