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Fisher 685 Instruction Manual

Piston actuator
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Instruction Manual
D103626X012
™
Fisher
685 Piston Actuator
Contents
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Introduction

Scope of Manual

This instruction manual provides information on the installation, maintenance, and parts ordering for Fisher 685
piston actuators. Refer to separate instruction manuals for information regarding other equipment and accessories
used with these actuators.
Do not install, operate, or maintain a Fisher 685 actuator without being fully trained and qualified in valve, actuator,
and accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important
to carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. If
you have any questions about these instructions, contact your
proceeding.

Description

The Fisher 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.
www.Fisher.com
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Figure 1. Fisher 685 Piston Actuator
X0922
Emerson sales office
or Local Business Partner before
685 Piston Actuator
June 2017

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Summary of Contents for Fisher 685

  • Page 1: Table Of Contents

    Description The Fisher 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.

  • Page 2: Specifications

    1. The pressure/temperature limits in this bulletin and any other applicable standard or code should not be exceeded. 2. Consult factory for larger travels or cylinder diameters. The Fisher 585C family of actuators are available for smaller travels or cylinder diameters.

  • Page 3: Educational Services

    685 Piston Actuator June 2017 D103626X012 Educational Services For information on available courses for Fisher 685 piston actuators, as well as a variety of other products, contact: Emerson Automation Solutions Educational Services - Registration Phone: 1-641-754-3771 or 1-800-338-8158 E-mail: education@emerson.com emerson.com/fishervalvetraining...
  • Page 4 Instruction Manual 685 Piston Actuator June 2017 D103626X012 Table 3. Thrust THRUST AT SUPPLY PRESSURE, N (LBF) ACTUATOR SIZE STROKE 10.3 barg 4.1 barg (60 psig) 5.5 barg (80 psig) 6.9 barg (100 psig) (150 psig) 30183 (6786) 40245 (9048)

  • Page 5: Installation

    Instruction Manual 685 Piston Actuator June 2017 D103626X012 Table 5. Approximate Weights for Constructions with Handwheels MAXIMUM APPROXIMATE WEIGHT FOR ACTUATOR SIZE, kg (lbs) VALVE TRAVEL mm (inches) 102 (4.00) 591 (1304) 664 (1463) 834 (1838) 925 (2038) 203 (8.00)

  • Page 6: Three-Way Valve Applications Note

    3 and 4. If you purchase a 685 actuator for field installation on a control valve, mount the actuator on the valve and secure it to the bonnet with the eight bonnet-to-actuator bolts. The stem connection should then be made up to clamp the actuator stem and valve plug stem together to provide proper valve travel.

  • Page 7: Handwheel Operation

    Instruction Manual 685 Piston Actuator June 2017 D103626X012 connector slightly, tightening the locknuts together, and (with the valve plug off the seat) screwing the stem either into or out of the stem connector by means of a wrench on the locknuts.

  • Page 8: Maintenance

    Instruction Manual 685 Piston Actuator June 2017 D103626X012 Figure 2. Engage Pin Control Knob Operation OVERRIDE ENGAGE PIN (Key 38) PULL PIN (TO LOCK OVERRIDE ENGAGE PIN INTO PLACE) DISENGAGED ENGAGED POSITION POSITION ENGAGE PIN CONTROL KNOB (Key 33) S28909...

  • Page 9: Actuator Removal

    Instruction Manual 685 Piston Actuator June 2017 D103626X012 Actuator Removal The following procedure is for the removal of the actuator from a valve. 1. Disconnect the actuator tubing from the pressure connections on the upper and lower heads (keys 1 and 9) and positioner.
  • Page 10 Instruction Manual 685 Piston Actuator June 2017 D103626X012 piston rod O­ring (key 19), heat the piston assembly using a torch and unthread the piston rod (key 17) from the piston (key 5). 15. After the piston rod (key 17) has completely cooled, remove the piston rod O­ring (key 19). Clean the piston rod O­ring groove with a light degreaser.

  • Page 11: Parts Ordering

    Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Automation Solutions should not, under any circumstances, be used in any Fisher valve, because they may void your warranty, might adversely affect the performance of the valve, and could cause personal injury and property damage.

  • Page 12: Parts List

    Yoke Adaption Bracket Hex Nut  20 Hex Head Cap Screw  65 Yoke Adaption Bracket Stud  21 Yoke  22 Travel Scale  57 Stem Connector Hex Nut  58 Stem Connector Stud 100* 685 Actuator Grease (10 ounce tube) see parts kit (19B0808X222) *Recommended spare parts...
  • Page 13 Instruction Manual 685 Piston Actuator June 2017 D103626X012 Figure 3. Fisher 685 with Manual Handwheel LEFT SIDE VIEW RIGHT SIDE VIEW FRONT VIEW S24860...
  • Page 14 Instruction Manual 685 Piston Actuator June 2017 D103626X012 Figure 4. Fisher 685 without Manual Handwheel 57 58 E1566...
  • Page 15 Instruction Manual 685 Piston Actuator June 2017 D103626X012...
  • Page 16 Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user. Fisher, easy-e, and FIELDVUE are marks owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co.

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