Technical Parameters Category Parameter Specification / Description General Model Series 4221 (within ET Family) Type Top-Guided Globe Valve Flow Characteristic Linear, Equal Percentage, or Quick Open (depends on trim). Pressure & Temperature Pressure Rating (ANSI) ANSI Class 150, 300, 600 Max. Allowable Pressure Up to 1480 psig (102 bar) for Class 600. Temperature Range Standard: -350°F to 1100°F (-212°C to 593°C). Depends on body/trim materials and seals. Flow & Sizing Valve Sizes 1/2" to 6" (DN 15 to DN 150) Flow Capacity (Cv) Ranges from ~1 (for 1/2") to ~200 (for 6"), depending on trim size. End Connections Flanged (RF, RTJ), Buttweld, or Socket Weld. Materials & Construction Body Materials Alloy 20 (CN7M) is a very common standard material for the 4221, providing excellent corrosion resistance. Also available in 316 Stainless Steel (CF8M), Hastelloy, Duplex Stainless Steel, and others. Trim Materials Standard Trim: Stainless Steel. Severe Service Trim: Hardened alloys, Stellite, Ceramics. Seat Leakage ANSI Class II, IV, V, or VI (depending on trim selection). Actuator Mounting Designed for Fisher 1055/1061/1070 series pneumatic diaphragm actuators or other linear actuators.