Emerson Sempell PSRV VS99

30
SEMPELL MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES
TYPE VS99 PILOT OPERATED
The pressure relief in chambers B, C and D
causes the pressure to be reduced in pilot line
A as well, and the main valve opens.
Solenoid 1 Energized
Solenoid 2 Energized
Disc 1 Open
Disc 2 Open
Disc 3 Open
Disc 4 Open
Chamber A Pressure relief
Chamber B Pressure relief
Chamber C Pressure relief
Chamber D Pressure relief
Chamber E Lower pressure
If the solenoids are once again de-energized,
pre-pilot discs 2 and 4 close. Because of the
increasing pressure in chambers E above discs
1 and 3, the discs close again.
Solenoid 1 De-energized
Solenoid 2 De-energized
Disc 1 Open
Disc 2 Closed
Disc 3 Open
Disc 4 Closed
Chamber A Lower pressure
Chamber B Lower pressure
Chamber C Lower pressure
Chamber D Lower pressure
Chamber E Rising pressure
FUNCTION DMS 6 (open circuit principle)