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SEMPELL MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES
TYPE VS99 PILOT OPERATED
FUNCTION VCA
Solenoid 1 Energized
Disc 1 Open
Chamber A Reduced pressure
Solenoid 1 De-energized
Disc 1 Closed
Chamber A Pressure increase
Because of the pressure relief in pilot
chamber A, the main valve opens suddenly in
milliseconds.
If the solenoid is de-energized again, the
anchor together with the stem moves to the
upper position together with the stem; disc 1
follows this movement. After the VCA is closed,
pilot chamber A is refilled at the same time.
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