Fisher™ 685 Series Piston Actuators

Fisher™ 685 Series Piston Actuators

Product Description

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.

Specifications

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

Other Configurations:Contact your local Emerson business partner or sales office to learn about additional specifications or options for this product.

Features of Fisher™ 685 Series Piston Actuators

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.

Related products of Fisher™ 685 Series Piston Actuators

Fisher™ 585C Piston Actuator

Fisher™ 3025 Spring Opposed Diaphragm Actuator

Fisher™ 657 and 667 Diaphragm Actuators

Fisher™ 656 Direct-Acting Diaphragm Actuator