Pressure reducing valves
Series 684

Rueckruf EN

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Pressure reducing valves made of gunmetal, with ­female threaded connections

All characteristics and technical features of the stainless steel versions also apply to the series 684 made of corrosion-resistant gunmetal. The fully relieved valves which therefore even out inlet pressure variations are available with and without secondary venting and each in a diaphragm or a piston version. Pressure adjustment is carried out without tools via the ergonomically formed hand-wheel. The extremely small pressure loss in the pressure adjusting area leads to these high-performance pressure reducing valves having almost no competition.

  • Examples of use
  • Approvals
  • Downloads

For the protection of:

  • commercial and industrial plants

against too high supply pressure.

Use of pressure reducing valves, when in a piping system inspite of varying pressures on the inlet side a specific pressure on the outlet side must be kept.

  • compressed air supply plants
  • pneumatic control units
  • pressure booster plants air-side
  • shipbuilding industry and offshore plants


European Pressure Equipment Directive

TR ZU 032/2013 - TR ZU 010/2011

PED 2014/68/EU

Suitable for
Liquidsneutral and non-neutral
Air, gases and vapoursneutral and non-neutral
1/4" - 2"
- 40°C to + 120°C
Inlet pressure: up to 60 bar
Outlet pressure: 0,5 to 50 bar
(depending on version)
Data sheet/Capacity table