Fisher 685 Series piston actuators

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.

Any questions?

Erik Rune
Solution Seller
Phone. +46 54-57 92 31

Kenneth Olsson
Account Manager
Phone. +46 54-57 92 04

Martin Pettersson
Solution Seller
Phone. +46 54-57 92 40

Niklas Pettersson
Account Manager
Phone. +46 54-57 92 09

Morten Noppenau
Country Manager Askalon Denmark
Phone. +45 2121 3491

Peder Hvidberg
Area Account Manager West
Phone. +45 2178 5053

Taneli Luhanko
Inside Sales Engineer
Phone. +358 207 416 202
Mob. +358 40 757 4208

Actuation Double-acting, Spring-return, Linear
Certifications PED, CUTR, ATEX, SIL capable
Control Type Throttling, Positioning
Operating Temperature Standard Temperature
Power Source Pneumatic
Process Control On/Off, Throttling, Positioning
Valve Type  Angle Valve, Globe Valve


  • 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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