The SEBIM® POSV type GVG 3000 is designed for overpressure protection of the nuclear steam supply system in all designs of nuclear reactors.
The SEBIM® POSV GVG series was developed for overpressure protection of the steam generator or the main steam lines of all designs of nuclear reactor. The GVG series is the tubeless design of the previous SGSV series and uses some tubing interface with piloting systems in operation since the 1990’s.
Autonomous piloting system using the fluid in the protected process (no external source of energy is needed for operation)
No-Flow piloting system
Compact & tubeless design (drilling integral through valve body; reduced size & weight)
Excellent leak tightness (the disc and the nozzle are leak tight up to the point of opening and immediately again after closing)
No erosion of sealing faces; no chattering
Proven perfect repeatability and reliability
System insensitive to back pressure
Stable system: no mass spring effect
Steam Generator Safety Valves
Main Steam Lines Safety Valves
ASME Class 150 to 2500 or customized
PRESSURE CLASS & POWER
43 – 2,900 psi (0.3 – 20 Mpa)
393 T/h – 5,6 Mpa (Saturated Steam) adaptable
Special materials upon request
UPGRADES & ADAPTATIONS
Interface adaptable to the need
KEY FEATURES & BENEFITS
Excellent operation irrespective of fluid type; steam, gas, liquid or two-phase
Leak tightness up to the set-pressure minimises the mechanisms rate of ageing
Non-flowing pilot valve minimises the mechanisms rate of ageing
Excellent accuracy (better than 1%)
Repeatability (lower than 1%)
Soft opening/closing decreases load on surrounding equipment
Low or high pressure in-situ test during operation for preventative maintenance
In situ testing with or without pressure in the protected system
Maintained stability even when flow capacity is below the maximum rate
Reduced maintenance over a 10 years operating cycle
All main standards including RCC-M level 2, ASME section III Sub.NB Class 2, OTT, IEEE, NNSA
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