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SEMPELL
MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES
TYPE VS99 PILOT OPERATED
Design
Non-floating design
Reference
Olkioto 3, Flamanville 3,
Taishan 1 + 2, PWE Gösgen
Size / DN
1" / DN 25
Class / PN
Class 1500 / PN 250
Body material
Z2 CN 19-10 N2
Qualification
Areva Laboratory Erlangen with steam, water
and two-phase mixture and Karlstein
TYPE SIERION PILOT VALVE
AREVA NP has developed a new pilot valve especially for application in EPR pressurizer systems and together with Sempell, has brought it to
functional maturity and through all required qualification. The special feature of this valve is that after opening, it is closed to flow. Due to its design,
it could be achieved that the pilot valve featured nearly identical functional values for all different media states. Whether the medium is pure steam
or a mixture of steam and water, or if the system medium is already pure water, is largely irrelevant. In addition, the accrual of pure hydrogen is
controlled. To ensure this good functional behavior, no isolation was used, because the accumulating medium should always condense into water
within the interior chambers of the pilot valve.
Summary of Contents for Sempell PSRV VS99
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