Zeron Fastners
Industrial Valves & FastenersPressure Relief Valves
Pressure Relief Valves (PRVs) are automated safety control devices designed to protect closed pressurized systems from exceeding maximum allowable working pressure (MAWP). Unlike fast-acting pop safety valves, a Pressure Relief Valve opens proportionally to the pressure increase above set point, making it the ideal protective choice for incompressible liquid systems, hydraulic circuits, and chemical transport lines.
Zeron Fastners manufactures spring-loaded and pilot-operated Pressure Relief Valves tailored for continuous duty in oil pumping stations, offshore rigs, boiler feedwater loops, and chemical dosing systems. Designed with precision stainless steel springs, micro-finished seating surfaces, and optional balanced bellows to counteract variable backpressure.
Technical Specifications
| Specification Feature | Details & Standard Compliance |
|---|---|
| Design Standards | API 520, API 526, ASME B16.34, ISO 4126-1 |
| Size Range | 1/2" to 12" (DN15 - DN300) |
| Set Pressure Range | 1 Bar to 350 Bar (15 PSI to 5000 PSI) |
| Pressure Ratings | Class 150# to Class 2500# (PN16 - PN420) |
| End Connections | Flanged (RF, RTJ), Screwed (NPT, BSP) |
| Body Materials | ASTM A216 WCB, A351 CF8M, Duplex 2205, Hastelloy C276, Monel |
| Trim / Internal | SS 316 with Stellite Overlay, 17-4PH Stainless |
| Overpressure Allowance | 10% Standard Liquid/Gas, 21% Fire Hazard Condition |
| Backpressure Compensation | Balanced Bellows or Piston Design available |
| Testing Standard | API 527, API 598 |
Relief Valve Configurations
| Type & Model | Key Features & Operating Applications |
|---|---|
| Direct Spring-Loaded PRV | Standard self-actuated valve offering dependable proportional liquid relief. |
| Balanced Bellows Relief Valve | Isolates the spring bonnet from corrosive fluids and nullifies variable superimposed backpressure. |
| Thermal Expansion Relief Valve | Compact 1/2" to 1" valve protecting heat exchangers and isolated pipe segments from solar heating. |
| Pilot-Operated Relief Valve | Advanced valve allowing operation close to set pressure with tight sealing and zero simmer. |
