TÜV/CE safety valves for solar plants
and district heating Series 851bG

Rueckruf EN

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

High performance safety valves with bellows to protect non-intrinsically safe solar plants with temperatures above 200 °C as well as district heating systems, boilers and pressure vessels. The metal bellows protects sliding and moving parts from the medium and thus from dangerous soiling. The spring housing and spring are protected against the ingress of steam and high temperatures.

  • Examples of use
  • Approvals
  • Downloads

For the protection of:

  • pressure tanks/-systems for neutral / non-neutral vapours and gases
  • boilers
  • Closed-circuit solar systems with temperatures > 120°C and for all static heights.
  • district heating systems with temperatures >120°C 
  • district heating systems primary side
  • solar plants in building and industrial technology
  • steam- and industrial boiler plants

Safety valves are set and sealed at the factory.


TÜV Type test approval 666

EC type examination

TR ZU 032/2013 - TR ZU 010/2011
D/G (S/G)

AD 2000 Data sheet A2
TRD 421
AGFW 505
DIN 4747 Part 1
DIN 4757 Part 1 and Part 2
DIN EN 12976
DIN EN 12977
DIN EN ISO 4126-1
DRG 2014/68/EU

Suitable for
1/2" - 2"
- 60°C to + 225°C
(depending on version)
0,5 - 50 bar
Data sheet/Capacity table