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Fisher™ 685 Series Piston Actuators

Fisher 685 series piston actuators provide medium to high thrust output for a variety of medium to very large Fisher sliding-stem valves, including the easy-e™, HP, EH, FB, and 461 valves. The double-acting design of the actuator results in stiff, precise positioning. Spring-return constructions are also available and offer a fail open or closed mode of operation when paired with a valve.

Key Features

  • Maximum thrusts of up to 354 kN (79,000 lbf) can be produced, depending on construction.
  • Depending on size, strokes of up to 610 mm (24 in) are available.
  • The double-acting construction allows for stiff, precise positioning.
  • A side-mounted handwheel is available for all sizes except the size 28, which uses a hydraulic hand pump for manual override control.
  • Internal bias spring constructions are available for applications requiring a mechanical fail mode.
  • Low friction piston seals and cylinder coatings reduce sliding friction and wear.
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