FISHER™ NOTCHFLO™ DST
Specifications:
Valve Size: 2" to 16" (DN 50 to DN 400)
Pressure Class: ANSI 150 through 2500
End Connections: Flanged (RF, RTJ), Butt-Weld
Temperature Range: -29° to 427°C (-20° to 800°F) [Depends on seal materials]
Performance & Flow Characteristics:
Shut-Off Class:
Standard: ANSI Class V (Metal-to-metal seat)
Optional: ANSI Class VI (With soft seal)
Flow Characteristic: Equal Percentage (Standard)
Rangeability: Up to 75:1
Flow Coefficient (Cv): High Cv values. Specific values depend on valve size, trim, and pressure drop.
Noise Reduction: Capable of reductions up to 50 dBA.
Cavitation Protection: Designed to operate cavitation-free across its entire operating range.
Materials of Construction:
Body & Cover: Carbon Steel (WCB), Stainless Steel (CF8M/316), Alloy Steels (WC6, WC9, C12A)
Rotor & Shaft: 17-4PH Stainless Steel (standard), with optional hard facings (e.g., Stellite, Tungsten Carbide) for extreme erosion resistance.
Seat Ring: 316 Stainless Steel (standard), Stellite, other hardened alloys.
Diffuser Stack: 316 Stainless Steel.
Actuator & Accessories:
Actuator Types: Requires a robust rotary actuator due to potential high dynamic torques.
Pneumatic: Fisher 1051/1052 SRD Piston Actuators are commonly specified.
Electric: Electric Motor Actuators are also an option.
Positioner: A Fisher FIELDVUE™ DVC digital positioner is highly recommended for precise control, diagnostics, and to manage the high-performance capabilities of the valve.
Accessories: Limit switches, solenoid valves, supply pressure regulators, etc.
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