Key Parameters Category Parameter Name Description & Typical Values General Specifications Actuator Type Pneumatic, Spring-and-Diaphragm (61S) / Double-Acting (61D) Motion 90° Rotary (quarter-turn) Housing Material Aluminum with corrosion-resistant coating. Spring Material Epoxy-coated carbon steel (standard). Air & Pressure Data Standard Supply Pressure 3-15 psig (0.2-1.0 bar) control signal. Maximum Supply Pressure Typically 50-70 psig (3.4-4.8 bar) for spring-return models. Higher for double-acting. Torque Output Output Torque Varies by actuator size and air pressure. Sizes range from 61 (smallest) to 67 (largest). • Example (61S): ~40 to 500 in-lbs (∼4.5 to 56 Nm) depending on size and spring range. • Example (61D): Provides higher torque than equivalent spring-return models. Spring-Return Models (61S) Spring Ranges Multiple spring ranges are available to match the required torque and fail-safe action. Fail-Safe Action Fail-Closed or Fail-Open - Determined by the linkage setup. Performance Air Consumption Relatively low, typically a few standard cubic feet per stroke. Temperature Limits Standard: -20°F to 150°F (-29°C to 66°C). High-temperature kits are available for up to 250°F (121°C). Options & Accessories Positioners Can be mounted with a Fisher 3582 or similar rotary valve positioner for precise control. Limit Switches Feedback devices (e.g., Fisher 415) can be added to indicate valve position. Solenoid Valves Used for on/off control or as part of a safety instrumented system (SIS). Air Sets Filter regulators (e.g., Fisher 67/68) can be mounted directly to the actuator.
