FISHER™ 646
Specifications:
Valve Size: 3" to 12" (DN 80 to DN 300)
Pressure Class: ANSI 150
End Connections: Wafer, Lugged
Temperature Range: -20° to 400°F (-29° to 204°C) [Dependent on seat material]
Performance & Flow Characteristics:
Shut-Off Class: ANSI Class VI (Bubble-tight)
Flow Coefficient (Cv): High Cv values. Specific values depend on valve size.
Pressure Rating: 150 psi (10.3 bar) saturated steam; 275 psi (19.0 bar) for water, oil, and gas.
Materials of Construction:
Body: Ductile Iron (epoxy coated standard), Carbon Steel, Stainless Steel
Disc: 316 Stainless Steel (standard)
Stem: 17-4PH Stainless Steel (standard)
Seat: Resilient materials such as Buna-N (Standard), EPDM, or Viton® for different fluid compatibilities and temperature ranges.
Actuator & Accessories:
Actuator Types:
Pneumatic: Fisher 1051/1052 SRD spring-return and double-acting piston actuators, 657/667 spring-diaphragm actuators.
Electric: Electric motor actuators.
Positioner: A Fisher FIELDVUE™ DVC or other rotary positioner can be mounted for precise modulating control.
Accessories: Limit switches, solenoid valves, filter regulators, etc.