Emerson Sempell PSRV VS99

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SEMPELL MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES
TYPE VS99 PILOT OPERATED
TYPE DMS 5/6
Design
Forged one-piece body with 2 nearly identical
valves for alternating testing during operation
Reference
First used for Main steam valve set
Approx. 1000 pilot valves in use
Size / DN
1½" / DN32
Class / PN
Class1500 / PN250
Body material
Z2 CN 19-10 N2, 1.4313
Qualification
Full-scale tested together with Main steam
isolation valve and Main steam safety valve,
IEEE-qualified solenoid by Whyle Inspection
Laboratories, California
BLEED AND FEED VALVE WITH SOLENOID
The products DMS 5/6 and EMS 5/6 were developed especially for nuclear applications and were first used on the FSA-station (main steam valve set)
of the KWU pressurized water reactors. The type DMS 5/6 double-solenoid valves are the most widely distributed. The double-solenoid valve consists
of two nearly identical valves, the inner valve facing the main valve, and the outer valve. Due to design requirements, the inner valve is not completely
tight while the outer valve is absolutely tight at the seat. This design permits the alternating functional testing of the inner and the outer valves
without actuating the main valve in the process.
The digits 5 and 6 identify the de-energized open circuit or energized open principles. The valves EMS 5 and DMS 5 function according to the
de-energized open principle, whereas the valves EMS 6 and DMS 6 function according to the energized open principle.
TYPE EMS 5/6
Design
The EMS is just half of a DMS, when alternating
actuation during operation is not needed.
Reference
Belgium PWR,
Russian PWR (VVER)
China (HTR)
Size / DN
1½" / DN 32
Class / PN
Class 1500 / PN 250
Body material
1.4313
Qualification
IEEE-qualified solenoid by Whyle Inspection
Laboratories, California