Pressure Safety and Relief (PSV / PRV) Valve

Pressure Relief Valves operate by process pressure. The seat to seal interface is a highly polished disc forced onto a seat by a spring with a known tension. Adjustment of the spring tension dictates the pressure at which the valve will relieve the line pressure i.e. the higher the spring tension, the higher the pressure required to lift the disc off the seat. Some pressure relief valves have a manual over-ride hand lever which can be utilized when the user requires to relieve / dump excess pressure, but where the maximum allowable process pressure has not yet been reached or exceeded.

The primary function of a safety valve is to protect against over-pressurisation of the process piping system. This device ensures that the maximum allowable line pressure can never be exceeded. The secondary function, as described above is for dumping pressure within the system. This can be for operational, or for safety reasons.
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Pressure Safety and Relief (PSV / PRV) Specification

Click for more Pressure Safety and Relief (PSV / PRV) - General Design Criteria  
  • Automated Set-Pressure Operation
  • Manual Over-ride Options
  • Special Trim Design Options
  • Operating temperature and fluids suitability - further information on request
  • Firesafe / Cryogenic / Gas Service certified options
  • Modification service available for all stock options
Click for more Standard Pressure Class Ratings / End Connections
  • ANSI 150, 300, 600, 800, 1500 & 2500lb - Flanged RF, RTJ, Butt-Weld and Hub ends
  • PN, API and other Pressure Class Valves available on request

Common Materials of Construction Material Specifications
Standard Carbon Steel ASTM A105
A216 WCB
WCC
Low temperature Carbon Steel ASTM LF2
A352 LCC
LCB
Stainless Steel ASTM A182 F316
ASTM A182 F316L
ASTM A182 F304
ASTM A182 F304L
ASTM A182 F321
ASTM A182 F347
ASTM A351 CF8M
ASTM A351 CF3M
Specials F44
SMO
F51
Duplex
Super Duplex
Monel
Hastelloy
Titanium
Inconel
Bronze
Alu. Bronze
PSV Valve