Technical Specifications / Parameters Parameter Specification Model Fisher 627 Type Scotch Yoke, Pneumatic Piston Actuator Action Double-Acting (Standard). Convertible to Spring-Return. Standard Air Supply Pressure 40 to 120 psig (2.8 to 8.3 bar). Torque Output Varies by specific size and supply pressure. Example for a size 60 at 80 psig: ~1800 lb-in (~203 Nm). (Refer to factory torque tables for exact values). Temperature Range Standard: -40°F to +180°F (-40°C to +82°C). High-Temp Options: Available with high-temperature seals and lubricants. Spring-Return Options Multiple spring ranges available to provide fail-open or fail-close action. Mounting Style Direct mounting to valve shaft according to ISO 5211 and other industry standards. Position Indicator Visual indicator showing valve position (Open/Closed). Port Connections 1/4" NPT (Standard). Materials Cylinder Body & Yoke: Aluminum with corrosion-resistant coating. Piston: Aluminum. Shaft & Hardware: Carbon Steel or Stainless Steel. Seals: Buna-N (Standard). Viton and others available. Accessories Compatible with Fisher field-mounted instrumentation like the 3570/3582 position transmitters, 1067 volume boosters, and limit switches.