Pressure reducing valves control the pressure
Pressure REDUCING VALVES control the pressure at the outlet side.
The type pressure reducing valve is a diaphragm-controlled, spring-loaded proportional control valve made of CrNiMo-steel with smooth surfaces. The valve cone has a soft seal. Setting screw and spring are integrated so that altering the pressure setting does not charge the length of the unit. The sealing quality is equal to or better than VDI/VDE guideline 2174.
With depressurized pipeline the spring keeps the valve cone in open position. Under pressure the medium flows from the inlet side through the valve seat into the body and acts on the diaphragm/spring system from the outlet side (outlet pressure).
The outlet pressure balances the force of the valve spring across the diaphragm (set value). As the outlet pressure rises above the pressure set using the setting screw, the valve cone moves toward the seat causing the flow to be restricted. As the outlet pressure drops the restricting orifice becomes larger. The valve is fully open if the pipeline is depressurized. Rotating the setting screw clockwise increases the outlet pressure.
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