Fisher™ 480 Series Yokeless Piston Actuators
Fisher 480 series actuators are yokeless piston actuators that are used in either throttling or on/off applications with ball valves, Butterfly valves, louvers, dampers, and rheostats. They require pneumatic pressure loading from double-acting positioners or from on/off loading and unloading devices.
The Fisher™ 480 Series Yokeless Piston Actuators are rugged, high-performance pneumatic actuators engineered to deliver precise and reliable linear motion for control valves in demanding industrial applications. Designed by Emerson, these actuators combine compact construction, exceptional thrust capability, and accurate valve positioning, making them ideal for both on/off and throttling service. Unlike traditional yoke-mounted actuators, the yokeless design of the 480 Series provides a direct connection between the actuator and valve, reducing side loading and friction. This design enhances control accuracy, extends valve stem life, and simplifies installation and maintenance. The Fisher 480 actuators utilize a double-acting piston configuration, offering bidirectional control with fast, smooth response to signal changes. Their high thrust output enables reliable operation of large or high-pressure valves, even under severe service conditions. Constructed from durable materials and available in various sizes, the 480 Series ensures long-lasting performance in industries such as oil and gas, refining, petrochemical, and power generation.
Technical Specification of Fisher™ 480 Series Yokeless Piston Actuators
- Actuation
- Double-acting, Quarter-turn, Rotary
- Certifications
- PED, CUTR, ATEX
- Control Type
- On/Off
- Power Source
- Pneumatic
- Valve Type
- Ball Valve, Butterfly Valve, Louver, Damper, Rheostats
- Other Configurations
- Contact your local Emerson business partner or sales office to learn about additional specifications or options for this product.
Feature of Fisher™ 480 Series Yokeless Piston Actuators
- Actuator with or without positioners and snubbers is available in an assortment of sizes, stroking speeds, thrusts, and travels to handle most control requirements.
- Yokeless construction permits a low-profile assembly by allowing close coupling to the control device; either through a bracket or by direct-mounting on a bonnet flange.
- The cylinder can operate with supply pressures as low as 2.4 bar (35 psig) or as high as 10.3 bar (150 psig).
- Actuators have maximum rated travels of up to 206 mm (8.125 in).
- Positioner/actuator action is easily reversed in the field with no additional parts. Positioner sensitivity, travel span, and travel starting point are factory set and need to be reset only if operating conditions have changed or if the positioner has be