TÜV/CE safety valves for solar plants
and district heating Series 651mSK

Rueckruf EN

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

Diaphragm safety valve for the protection of small and medium-sized, intrinsically safe solar plants. The valve is characterized by a number of special features: Temperature resistance tested up to 160 °C, 100% metal design and available with different connection types up to a size of one inch. The valve is type tested according to TÜV standards for closed, intrinsically safe solar heating systems with a flow temperatures of up to 120 °C. Depending on the connection size, it is suitable for a heating output of up to 200 kW.

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For the protection of:

  • closed-circuit, intrinsically safe solar heating systems with water or water mixtures as a heat transfer medium, with permissible supply temperatures of up to 120°C.
    As these valves are completely made of metal, they can also be installed at high environmental or radiation temperatures. All materials suitable for max. temperatures up to 160°C.
  • intrinsically safe, thermal solar plants

For non intrinsically safe plants and temperatures >120°C please use the safety valves 451/851bG series or 452/852bGL series.

Safety valves are set and sealed at the factory.


TÜV Type test approval 2013

EU type examination

TSG ZF001-2006

TR ZU 032/2013 - TR ZU 010/2011

TRD 721
DIN 4757 Part 1
DIN EN 12976
DIN EN ISO 4126-1
PED 2014/68/EU

Suitable for
Hot water
1/2" - 1"
- 10°C to + 120°C
2,0 - 10 bar
Data sheet/Capacity table