Symbols of different types of Pressure Relief Valves

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Symbols of Pressure Relief valve used in different Instrumentation diagram.

1.Pilot operated, balanced piston relief valve

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2.Direct-acting relief valve

Direct-acting relief valve

3.Non-adjustable direct-acting relief valve

Non-adjustable direct-acting relief valve

4.Direct-acting relief valve, CE marked

Direct-acting relief valve, CE marked

5.Fast-acting, pilot operated, balanced piston relief valve

Fast-acting, pilot operated, balanced piston relief valve

6.Pilot operated, balanced poppet relief valve

Pilot operated, balanced poppet relief valve

7.Anti Shock, pilot operated, balanced poppet relief valve

Anti Shock, pilot operated, balanced poppet relief valve

8.Direct-acting relief valve - pilot capacity

Direct-acting relief valve - pilot capacity

9.Kick-down, pilot operated, balanced piston relief valve

Kick-down, pilot operated, balanced piston relief valve

10.Air-controlled, pilot operated, balanced piston relief valve

Air-controlled, pilot operated, balanced piston relief valve