13
SEMPELL
MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES
TYPE VS99 PILOT OPERATED
THE FUNCTION OF THE MAIN VALVE
System pressure at operating pressure
Disc 1
Closed
Chamber A
System pressure
Chamber B
System pressure
System pressure through operating pressure
Disc 1
Closed
Chamber A
System pressure
Chamber B
Reduced pressure
Under operating conditions, the same operating
pressure predominates in all chambers of the
safety valve including the pilot line.
If the system pressure exceeds the set
pressure of the pilot valve, the pilot valve opens;
therefore the pilot line opens also. The steam of
the pilot chamber B is reduced.
Содержание Sempell PSRV VS99
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