Fisher® 685 Piston Actuator0 pages

Product Bulletin

685 Piston Actuator

61.2:685
March 2014

D103625X012

Fisherr 685 Piston Actuator
The 685 is a double-acting piston actuator that
provides accurate, high thrust output for short to long
travel applications. This actuator is designed for use
with a variety of medium to large Fisher sliding-stem
control valves including the easy­e™, FB, TBX, HP, EH,
and 461.
The 685 family is available in several configurations to
cover a wide range of application requirements.
Typical travels range from 25 to 610 mm (1 to 24
inches) and cylinder diameters range from 305 to 660
mm (12 to 26 inches). Thrust capabilities extend to
354 kN (79,000 lbf) and above with special
constructions.
The 685 can be used with the FIELDVUE™ DVC6200
digital valve controller for throttling applications, or
with switching valves for on­off control. This actuator
can also be fitted with volume boosters for fast
stroking requirements.

Features

High Thrust Capability — Maximum thrusts of up to
354 kN (79,000 lbf) can be produced.

X0922

Low Friction — Low friction piston seals and either
chrome plated or fluoropolymer coated cylinder
bores reduce sliding friction and wear.

Manual Override — An optional side-mounted
handwheel is capable of extending or retracting the
actuator manually and can be engaged at any
position from full open to full closed.

Broad Application Coverage — Standard
constructions offer travels of up to 610 mm (24
inches) and cylinder diameters of up to 660 mm (26
inches). Even larger constructions are available
upon request.

Wide Temperature Range — Standard constructions
offer a temperature range of -40 to 93_C (-40 to
200_F), however higher or lower temperatures are
possible. Special constructions can operate as low
as -54_C (­65_F) and as high as 204_C (400_F).

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