Emerson Sempell PSRV VS99

16
SEMPELL MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES
TYPE VS99 PILOT OPERATED
TYPE VS66 SELF-ACTING SPRING-LOADED PILOT VALVE
The design of the spring-loaded steam pilot valve is adapted completely individually to the corresponding construction of the main valve. At least
two pilot valves per main valve are required, because one valve is always switched active while the other is blocked. This is made possible by the
available stop valves to the impulse and pilot lines. The stop valves are equipped with safety locking devices which facilitate a controlled blocking.
Design
Floating design with supplementary loading
Reference
PWR Germany and Brazil,
PWR (VVER)
Size / DN
1" / 25mm
Class / PN
class1500 / PN250
Body material
1.4553 / 1.4541
Qualification
Together with VS99
Stable valve performance when subject to
two-phase flow or low-flow transient, no costly
loop seal required
Design
Floating design
Reference
Shin Kori 3 and 4,
Shin Hanul 1 and 2,
Barakah 1 - 4
Size / DN
1" / 25mm
Class / PN
Up to class2500 / PN400
Body material
A182 F316 LN (1.4406)
Qualification
ASME III NV (together with VS99)
Stable valve performance when subject to two-
phase flow or low-flow transient, no costly loop
seal required