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Products  >  500 Series  >  Control Functions  >  Pressure Sustaining & Relief Valves  >    

Pressure Sustaining & Relief Valves

PS - Pressure Sustaining Valve
PS(R) - Pressure Relief Valve

The valve maintains upstream pressure, regardless of flow rate variations. The valve will be in the “closed” position if the upstream pressure drops below the set-point and will be fully-opened when the upstream pressure exceeds the set-point.

DI - Pressure Differential Sustaining Valve
The valve maintains a preset pressure differential between the upstream and downstream pressures. The valve controls booster pumps discharge, heating and cooling systems, bypass configurations, etc.


QR - Quick-Relief Safety Valve
The valve opens instantly when the pressure in the pipeline exceeds the safelevel, thus relieving excessive pressure from the network. When the pressure returns to normal, the valve closes slowly, at an adjustable pace.


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