Technical Specifications / Parameters Parameter Specification Model Fisher Type B Type Pilot-Assisted / Internally Relayed Pressure Regulator Size & Connections Sizes: 2", 3", 4", 6" (NPT) Other: Flanged connections available. Body Material Cast Iron (standard). Internal Materials Stainless Steel (critical parts), Buna-N (diaphragms & seals). Inlet Pressure Range (P1) Up to 400 psig (28 bar) for standard models. Outlet Pressure Range (P2) Common Spring Ranges: Adjustable from 4 oz/in² to 60 psig (0.01 to 4.1 bar). Various springs cover different portions of this wide range. Temperature Range -20°F to 150°F (-29°C to 66°C) - standard elastomers. Flow Capacity (Cg) Example: 2" Type B has a Cv of approximately 95. (Varies by size). Internal Relief Capacity Standard on most models. Capacity varies with model and set pressure. Leakage Class ANSI FCI 70-2 Class IV (Metal-to-metal seat).
