EBV Coil-Spring Actuator

Coil-spring-return actuators, made by Posi-Seal, have recently been selected for suction lines of hydrocarbon pumps. They can be thermally-activated with fusible links which melt in case of fire. They are listed in the FM Approved Equipment Handbook.

Once tripped by either the links or by a remote electric or pneumatic signal, the valve and actuator must be opened manually with the handwheel. Melted links must of course be replaced.

A report entitled, Thermally-Activated Fire-Safe Emergency Block Valve, is listed in the References.

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