Industrial Controller
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Infinite Innovation, the Future of Industrial Control Systems
Infinite Innovation, the Future of Industrial Control Systems
PRODUCT POSITION:HOMEPRODUCT—FISHER 646
FISHER 646
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.
DESCRIBE
The Fisher 646 is a pilot-operated, high-capacity pressure reducing regulator designed for demanding natural gas, process gas, and air applications. It is renowned for its exceptional stability and accuracy in maintaining a reduced outlet pressure despite significant fluctuations in inlet pressure and flow demand.
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