Technical Parameters Category Parameter Specification / Description General Model 627-328 Type Pilot-Operated Backpressure/Relief Regulator Pressure & Capacity Body Pressure Rating (ANSI) Typically ANSI Class 300, 600, or higher. Max. Inlet Pressure (P1) Up to 1440 psig (99 bar) or higher, depending on body class. Setpoint Pressure Range Defined by the "-328" suffix. This code specifies a particular pilot spring that corresponds to a specific, narrow pressure range (e.g., 30-120 psig, 200-400 psig, etc.). *This is the primary difference from the 627-348.* Flow Capacity (Cv) Very High. Specific Cv depends on the main valve size defined by "-328". Construction & Materials Body Materials Carbon Steel (Standard), Stainless Steel, Other Alloys. Trim Materials Stainless Steel. Pilot Valve 627 Pilot (Relief Pilot) - senses upstream pressure. Connections & Environment Inlet/Outlet Connections Flanged (RF, RTJ) per ANSI standards. Vent Connection Flanged or threaded. Ambient Temperature Standard: -20°F to 150°F (-29°C to 66°C).
