Key Parameters Category Parameter Name Description & Typical Values Valve Specifications Valve Size 1/2" to 6" (DN 15 to DN 150) End Connections Flanged - ANSI Class 125, 150, 200, 300. RF (Raised Face) standard. Body Styles Globe Body - Standard. Body Materials Cast Iron (Standard for many services), Carbon Steel (WCB), Stainless Steel (CF8/304, CF8M/316). Pressure & Temperature Pressure Rating Varies with body material and class. Common ratings are ANSI Class 125, 150, 200, and 300. Temperature Range Standard packing: -40°F to 450°F (-40°C to 232°C). Extended ranges possible with high-temperature packing. Internal Parts (Trim) Trim Types Quick-Open (Standard), Linear, Equal Percentage. Trim Design Top-Guided, Unbalanced, Single-Port Plug. Leakage Class Class II (standard metal-to-metal seat). Class IV (with optional soft seat). Trim Materials Stainless Steel (Standard), Carbon Steel, Stellite, Brass. Seat Ring Screwed-in or seal-welded design. Flow Capacity Flow Coefficient (Cv) Varies by valve size and trim. Consult specific Cv tables. Example: A 2" SR8 has a typical Cv in the range of ~15 to 50. Actuator (Typical) Type Fisher 657 (spring-and-diaphragm, direct-acting) or 667 (spring-and-diaphragm, reverse-acting). Action Air-to-Open (Fail Close) or Air-to-Close (Fail Open). Standard Signal 3-15 psig (0.2-1.0 bar) control signal.
