Technical Parameters Category Parameter Specification / Description General Model Series 657 Type Pilot-Operated Pressure Reducing Regulator Pressure & Temperature Body Rating (ANSI) ANSI Class 150, 300, 400, 600, 900 Max. Inlet Pressure (P1) Up to 1440 psig (99 bar) for certain classes. Outlet Pressure Range (P2) Wide range, adjustable via the pilot spring. Common ranges from 5 to 500 psig (0.3 to 34 bar) or higher. Flow & Sizing Flow Capacity (Cv) Very High. Ranges from ~30 to over 1000+, depending on the valve size (e.g., 1", 2", 3", 4", 6", 8"). End Connections Flanged (RF, RTJ) according to ANSI standards. Materials & Construction Body Materials Carbon Steel (Standard), Stainless Steel, Other Alloys. Trim Materials Stainless Steel. Pilot Valve 657 Pilot (Reducing Pilot) - senses downstream pressure. Options Common Pilot Options • Monitor Pilot: For overpressure protection. • SLM (Slow Opening) Pilot: For safe start-up.
