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Pressure Safety and Relief (PSV / PRV)
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 utilised 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 valveis 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.
Pressure Safety and Relief (PSV / PRV) Specification
The primary function of a safety valveis 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.
Pressure Safety and Relief (PSV / PRV) Specification
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
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 |
