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Fisher™ 656 Direct-Acting Diaphragm Actuator
Fisher 656 Actuator
Fisher 656 diaphragm actuators provide small to medium thrust output for bracket-mounted applications.
Such applications include operation of Butterfly valves and built-in turbine valves, louvers, dampers, and other similar equipment.
Fisher™ 656 Direct-Acting Diaphragm Actuator


Spring-return, Linear
Control Type
On/Off, Throttling, Positioning
Operating Temperature
Standard Temperature
Power Source
Process Control
On/Off, Throttling, Positioning
Valve Type
Angle Valve, Globe Valve
Other Configurations
Contact your local Emerson business partner or sales office to learn about additional specifications or options for this product.


  • Maximum thrusts of up to 5.3 kN (1,200 lbf) can be produced, depending on construction.
  • Depending on size, strokes of up to 105 mm (4 1/8 in) are available.
  • Four tapped holes in the actuator base permit either bracket or plate mounting.
  • A wide spring selection is available for nearly any control application.
  • Rugged yoke and casings provide stability and corrosion-resistant protection.
  • Available with a top-mounted handwheel for manual override control.