Pressure reducing valves
Series 681

Rueckruf EN

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Pressure reducing valves made of gunmetal, with threaded connections

A particularly robust pressure reducing valve in all-metal design, which has proven itself not only in drinking water applications but also in harsh operating conditions in industrial applications or in cases of fluctuating environmental temperatures. This pressure reducing valve is also suitable for hot water applications. Stability and reliability: The set outlet pressure at zero-usage is held constant even in the case of greatly varying inlet pressures.

  • Examples of use
  • Approvals
  • Downloads

For the protection of:

  • domestic water supply systems
  • commercial and industrial plants

against too high supply pressure.
Pressure reducers are used, if within a piping system despite of varying pressures on the inlet side a certain pressure must not be exceeded on the outlet side.

  • potable water supply according to DIN 1988
  • process water supply in industrial-and building technology
  • snow-making equipment
  • fire-fighting equipment and sprinkler systems
  • shipbuilding industry and offshore plants


DIN-DVGW type examination (up to 80°C)

Type approval ACS

Type approval WRAS (up to 85°C)

Type approval SINTEF

Type approval PZH

TR ZU 032/2013 - TR ZU 010/2011

DIN DVGW guidelines
DIN EN 1567
DIN 1988
PED 2014/68/EU

Suitable for
Liquidsneutral and non-neutral
Air, gases and vapoursneutral and non-neutral
Potable water hot up to + 85°C
Potable water coldup to + 40°C
1/2" - 2"
- 20°C to + 120°C
Inlet pressure: up to 40 bar
Outlet pressure: 0,5 to 15 bar
(depending on version)
Data sheet/Capacity table