Technical Specifications / Parameters Parameter Specification Model Fisher EHU Type Pilot-Operated, Spring-Loaded, Pressure Reducing Regulator Body Size & Pressure Class Sizes: 2", 3", 4", 6" (ANSI Flanged) Pressure Class: ANSI Class 300, 400, 600. End Connections Flanged (RF or RTJ). Body Materials Carbon Steel (WCB), Ductile Iron. Trim Materials Stainless Steel (standard). Inlet Pressure Range (P1) Up to 600 psig (~41 bar) for Class 300 models; up to 1440 psig (~99 bar) for Class 600 models. Outlet Pressure Range (P2) Adjustable over a wide range, dependent on the pilot and spring used. Common ranges span from 3 psig to 250 psig (0.2 to 17 bar). Temperature Range Standard: -20°F to +150°F (-29°C to +66°C). Extended: Options available for lower temperatures with weather covers. Pilot Gas Supply Typically filtered and regulated from the main line. Leakage Class Shutoff Class: ANSI/FCI 70-2 Class IV (standard metal seat). Flow Capacity (Cg) Varies by size; for example, a 2" EHU has a Cg of approximately 235, while a 6" EHU can have a Cg over 2000.
