Functionality:

Pressure reducing valves regulate the pressure behind the valve.

The pressure reducer type PR is a diaphragm-controlled, spring-loaded and automatic proportional regulator.
All parts in contact with the product are made of stainless steel 1.4571 / 1.4404 or Hastelloy C. The valve cone is soft-sealing with a valve seal made of perfluoroelastomer (Kalrez / Chemraz / J-6000) or fluoroelastomer (Viton). The tightness of the valve shut-off corresponds at least to VDI / VDE guideline 2174 or DIN EN 1349.

When the pipeline is depressurized, the adjusting spring holds the valve cone in the open position. The fluid flows under pressure from the inlet side (P1) through the valve seat and acts on the diaphragm-spring system from the outlet side (downstream pressure P2). On the diaphragm made of PTFE or Viton, the downstream pressure to be regulated is in equilibrium with the force of the adjusting spring (setpoint). If the downstream pressure rises above the setpoint set on the adjusting screw (or the setpoint via the dome pressure), the valve cone is moved towards the seat and the throughput is throttled until the valve closes. Conversely, the flow increases when the downstream pressure falls below the setpoint.

Product option:

PR / F (spring-controlled) is suitable for reducing pressure for liquids and gases in the
range from 1.0 to 13 bar.

PR / D (dome pressure controlled) is suitable for reducing pressure for liquids and gases in the
range from 0.2 to 40 bar (DN 15 and 25 to 40 bar; DN 50 and 100 to 16 bar).