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SEMPELL MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES
TYPE VS99 PILOT OPERATED
FUNCTION VCA
Solenoid 1 De-energized
Disc 1 Closed
Chamber A System pressure
In normal operation, the solenoid is
de-energized and disc 1 is closed. System
pressure predominates in pilot line A, which
keeps the solenoid valve and the main valve
closed.
Solenoid 1 Energized
Disc 1 Open
Chamber A
Start of the pressure reduction
Once the solenoid is energized, the solenoid
plunger presses onto the bottom side of disc 1
from above and opens the disc. Pilot chamber A
is momentarily relieved.
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