Technical Parameters Category Parameter Specification / Description General Model Series 646 Type Pilot-Operated Pressure Reducing Regulator Pressure Ratings Body Rating (ANSI) ANSI Class 150, 300, 400, 600, 900 Maximum Inlet Pressure (P1) Up to 1440 psig (99 bar) for certain sizes and 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), Ductile Iron, Stainless Steel. Trim Materials Stainless Steel. Seat Ring Metal-to-metal for durability. Pilots & Options Standard Pilot 646 Pilot (Reducing Pilot) - senses downstream pressure. Common Options • Monitor Pilot: For overpressure protection. • SLM (Slow Opening) Pilot: For safe start-up. • Relief Pilots: To act as a backpressure regulator.
