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™ 644 AND 645
FISHER™ 644 AND 645
Technical Parameters Parameter Specification Model Fisher 644 (Reducing) Fisher 645 (Backpressure/Relief) Type Pilot-Operated Pressure Controller Function Pressure Reducing Backpressure Relief Body Materials Ductile Iron (Standard), Cast Iron, Carbon Steel End Connections Flanged (ANSI Class 150, 300, 600); Butt-Weld Size Range (Main Valve) 1" to 8" (DN 25 to DN 200) Maximum Inlet Pressure (P1) Up to 1440 psig (99 bar) for ANSI 600 models. Outlet Pressure Range (P2) Wide range available via interchangeable pilot springs. Temperature Range -20°F to 150°F (-29°C to 66°C) with standard elastomers. Flow Capacity (Cv) Very high. Example (2" 644): Cv ~ 45
DESCRIBE
The Fisher 644 and 645 are self-contained, pilot-operated pressure controllers used for precise pressure reducing and relief applications, particularly in oil and gas production, transmission, and distribution systems. They are known for their reliability, high capacity, and ability to maintain a stable set point under varying flow conditions.
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