Technical Parameters Parameter Specification Model Fisher 377 Type Pilot-Operated Safety Relief Valve (POSRV) Operation Full Nozzle or Full Bore design Set Pressure Range Wide range available, typically from 5 to 6000 psig (0.3 to 414 bar) depending on specific model and pilot. Temperature Range -450°F to 1000°F (-268°C to 538°C)，取决于主阀和导阀的配置和材料。 Body Materials Carbon Steel (Standard), Stainless Steel, Alloy Steels End Connections Flanged (Various ANSI Classes), Butt-Weld, Screwed (NPT) Orifice Size Wide range per API standards, from D (0.110 in²) to T (6.380 in²) and larger. Seat Tightness Bubble-tight (Typically ANSI Class IV or better) up to 98-99% of set pressure. Pilot Options Overpressure, Vacuum, Thermal Fire, Combination, etc.
