SEMPELL MODEL PSRV - PRESSURIZER SAFETY RELIEF VALVES
TYPE VS99 PILOT OPERATED
The design, construction and activation of the safety valves depends on the
design of the respective reactor and the corresponding specifications
FEATURES
• Extremely high sealing force, ensuring leak
tightness up to the set pressure.
• Very precise reproducibility of set pressure
and small operating pressure differences,
accuracy of pilot set pressure opening value
with repeats better 1%.
• All parts essential for function are kept at
operating temperature, thus no thermal shock.
• The disc piston is the only moving part in the
main valve, providing reduced maintenance.
• Low or high pressure in-situ test during
operation to preventive maintenance.
• Compact design from forged stainless steel.
• Redundancy of pilot valves and diversity of
function principle of pilot valves according to
specification.
• Suitable for all types of nuclear reactors.
TECHNICAL DATA
Size: Up to DN 200
Temperature: Up to 371°C
Pressure: Up to 200 bar
According to customer requirements and
specifications.
GENERAL APPLICATION
Pressurizer safety relief valves protect the
pressurizer from overpressure and must
ensure the following functions:
• Pressurizer relief for normal operating
transients
• Hot and cold overpressure protection on
liquid, steam, gas and steamwater-mixture
• Depressurization of reactor coolant system
following an accident
VCTDS-03163-EN 17/05
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