Type test approved flange safety valves
Series 852

Rueckruf EN

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Safety valves made of gunmetal, angle-type with flange connections

This safety valve range is also completely made of corrosion-resistant materials. The body is made of gunmetal and the stainless steel spring and internal parts, which are made of stainless steel, are hard to beat in terms of corrosion-resistance, especially when confronted with agressive watery solutions, salt water or a saline atmosphere.
The best possible version is available for virtually every application imaginable, whether this requires metal to metal sealing to meet highest tightness requirements or a metal supported o-ring seal made of a variety of materials or even back-pressure ­compensating gastight metal bellows or a gastight spring housing.

  • Examples of use
  • Approvals
  • Downloads

For the protection of:

  • pressure tanks and -systems for neutral / non-neutral vapours, gases and liquids
  • steam boilers and steam plants
  • bulk transport vehicles for liquid, granular and dusty goods¹

Please observe plant-specific regulations and use of appropriate valve version and sealing material.     

  • pressure booster plants (water-/air-side)
  • fire-fighting equipment
  • industrial- and commerical boiler plants
  • shipbuilding industry and marine equipment
  • pump protection

Safety valves are set and sealed at the factory.

¹ only for versions with bellows


TÜV-Type test approval 2007
D/G , F , F/K/S*

EC type examination
S/G , L , F/K/S*


TR ZU 032/2013 - TR ZU 010/2011
D/G (S/G) , F (L) , F/K/S*



AD 2000 Data sheet A2
TRD 421
TRB 801 No. 22 and No. 23*
DIN EN ISO 4126-1
PED 2014/68/EU
KGS AA 319


*only for versions with bellows

Suitable for
Liquidsneutral and non-neutral
Air, gases and vapoursneutral and non-neutral
DN 40 and DN 50
-60°C to + 225°C
(depending on version)
0,5 - 25 bar
Data sheet/Capacity table