Specifications: Parameter Fisher 657 Fisher 667 Valve Size 3" to 24" (DN 80 to DN 600) 3" to 24" (DN 80 to DN 600) Pressure Class ANSI 150 through 2500; API 2000 through 4500 ANSI 150 through 2500; API 2000 through 4500 End Connection Flanged (RF, RTJ), Butt-Weld Flanged (RF, RTJ), Butt-Weld Temp. Range (Standard) -50° to 230°C (-58° to 446°F) -50° to 230°C (-58° to 446°F) Temp. Range (Extended) Available for cryogenic or high-temp services Available for cryogenic or high-temp services Leakage Class ANSI FCI 70-2 Class IV, V, or VI (depending on trim) ANSI FCI 70-2 Class IV, V, or VI (depending on trim) Flow Characteristic Equal Percentage (Standard) Equal Percentage (Standard) Performance & Capacity: Parameter Fisher 657 Fisher 667 Trim Type Balanced, Cage-Guided. Whisper Trim® III (acoustic) optional. Balanced, Cage-Guided. Whisper Trim III (acoustic) standard. Pressure Drop Suitable for very high-pressure drop applications. Designed for the most extreme pressure drops. Noise Reduction Up to 35 dBA (with optional acoustic trim) Superior noise reduction, typically >35 dBA (standard) Flow Coefficient (Cv) Very high Cv values. Specific Cv depends on size and trim. Among the highest available Cv values for a given valve size. Stroking Speed Very Fast (e.g., full travel in 1-3 seconds, depending on actuator). Very Fast (e.g., full travel in 1-3 seconds, depending on actuator).
