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SEMPELL MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES
TYPE VS99 PILOT OPERATED
Motors Open signal
Disc 1 Open
Disc 2 Open
Chamber A Reduced pressure
Motors Close signal
Disc 1 Closed
Disc 2 Closed
Chamber A Rising pressure
FUNCTION DPDE
If the falling pressure in pilot line A reaches the
response pressure of the main valve, the main
valve opens.
If the signal to close the valve is given, in the
first valve the plunger is pulled back and with
the help of the spring and system pressure,
disc 1 closes again. At the same time, in the
second valve disc 2 is pressed back to its closed
position.
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