Technical Parameters Parameter Specification Model Fisher 2052 Type Spring-Loaded, Full Nozzle Safety Relief Valve Service Liquid, Steam, or Air/Gas Operation Standard (Non-Balanced) Body Materials Cast Iron (Standard for general service), Bronze, Carbon Steel, Stainless Steel End Connections Flanged (ANSI Class 125 & 150); Screwed (NPT) Orifice Designation & Area Sizes from D (0.110 in²) to T (6.380 in²) and larger, per ASME/API standards. Size Range (Inlet) 1" x 2" to 8" x 10" (e.g., 1" inlet, 2" outlet) Pressure Rating Up to 375 psig (26 bar) for Cast Iron bodies. Higher pressures with steel bodies. Temperature Limits -20°F to 450°F (-29°C to 232°C) with standard Buna-N elastomers. Higher temps with special materials. Set Pressure Range Varies by orifice size and spring. Available in a wide range, from a few psig to hundreds of psig. Backpressure Tolerance Limited (typically < 10% of set pressure) due to standard (non-balanced) bellows design. Standards Designed to meet ASME Section VIII and API 526 standards.
