Key Parameters
Category Parameter Description / Typical Values
Valve Body & Size Valve Body Style Single-port, top-guided, balanced or unbalanced trim. Cage-style design.
Size Range Typically from 1/2 inch (DN15) to 8 inches (DN200) and larger.
End Connections Flanged (ANSI Class 150, 300, 600, 900; PN ratings), Screwed (NPT), Butt-weld.
Face-to-Face Dimensions Complies with ISA S75.08, IEC 60534-3-1, and other international standards.
Pressure & Temperature Pressure Rating Dependent on body material and class. Common ratings: ANSI Class 150, 300, 600, 900.
Max. Operating Pressure Varies with size and class. e.g., Up to several thousand psi (e.g., 1480 psi / 102 bar for a 2" Class 600 valve).
Temperature Range Standard: -20°F to +450°F (-29°C to +232°C). Extended ranges available with special seals and materials (e.g., -320°F to +1000°F / -196°C to +538°C).
Flow Characteristics Flow Characteristics Equal Percentage, Linear, Quick Opening. Defined by the characterized cage.
Flow Coefficient (Cv) A wide range of Cv values available, selected by choosing the appropriate trim size and type.
Rangeability Typically high, e.g., 50:1 for equal percentage trim.
Leakage Class Leakage Class ANSI/FCI 70-2:
• Class II (Standard Double-seated)
• Class IV (Standard Single-seated)
• Class V (Soft Seat)
• Class VI (Soft Seat, Bubble-tight)
Materials Body & Bonnet Materials Carbon Steel (Standard), Stainless Steel (304SS, 316SS), Alloy 20, Duplex Stainless Steel, and other alloys.
Trim Materials Standard: 17-4PH Stainless Steel. Options: 316SS, Stellite, Hastelloy, etc., for erosion, corrosion, or cavitation service.
Seat Rings Stainless Steel, Stellite, or soft-seated (e.g., PTFE, RPTFE).
Actuator & Accessories Actuator Type Fisher 657 or 667 Diaphragm Actuator is commonly paired. Spring ranges and diaphragm sizes are selectable to achieve required thrust.
Action Air-to-Close (ATC) or Air-to-Open (ATO).
Accessories Positioners (e.g., Fisher DVC6200, DVC2000), Transducers, Limit Switches, Solenoid Valves, Air Sets, etc.
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