Pressure relief valves

Introduction to relief valves

 

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Last Updated
2015-02-18

 


 

 

Function: Limits the maximum pressure in a hydraulic circuit.

Pilot operated pressure relief valve simulation

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Direct operated pressure relief valves

relief valve symbol

Direct acting relief valves have

Features- quick response, low flow, leak free.

Pilot operated relief valves

Pilot operated relief valves

Pilot operated - high flow, internal or external leakage. Flatter PQ curve

Electrical unloading valves

Electrical unloading valves

Unloading valve - e.g. relief valve that switches to minimum pressure for start up.

Set up and commissioning issues

Setting:

Generally set 15 bar above the working pressure of system.

Back pressure:

Changes in pilot drain or backpressure will generally be added to the set pressure; making a sequence valve.

 


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