Fisher 685SE Instructions Manual
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Fisher 685SE Instructions Manual

Piston actuator
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Instruction Manual
D103799X012
™
Fisher
685SE and 685SR 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 685SE and
685SR piston actuators. Refer to separate instruction manuals for information regarding other equipment and
accessories used with these actuators.
Do not install, operate, or maintain 685SE or 685SR actuators 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
Partner before proceeding.

Description

The 685SE and 685SR are medium to large spring­return double­acting piston actuators that provide accurate, high
thrust output for short to long travel applications. These actuators are designed for use with a variety of medium to
large Fisher sliding­stem control valves including the easy­e™, FB, TBX, CVX, HP, EH, and 461.
These actuators feature an internal bias spring that forces the actuator piston rod to extend (685SE) or retract (685SR)
upon a loss of supply pressure, thereby ensuring a fail­closed or fail­open mode of operation. This effectively
eliminates the need for a trip valve and volume tank in most constructions.
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685SE/685SR Piston Actuator
Figure 1. Fisher 685SE Piston Actuator
X0993
Emerson sales office
June 2017
or Local Business

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Summary of Contents for Fisher 685SE

  • Page 1: Table Of Contents

    Fisher sliding­stem control valves including the easy­e™, FB, TBX, CVX, HP, EH, and 461. These actuators feature an internal bias spring that forces the actuator piston rod to extend (685SE) or retract (685SR) upon a loss of supply pressure, thereby ensuring a fail­closed or fail­open mode of operation. This effectively eliminates the need for a trip valve and volume tank in most constructions.

  • Page 2: Specifications

    1. The pressure/temperature limits in this instruction manual and any other applicable standard or code should not be exceeded. 2. Contact your Emerson sales office for larger travels or cylinder diameters. The Fisher 657, 667, and 585C family of actuators can be used for smaller travels or cylinder diameters.

  • Page 3: Principle Of Operation

    Principle of Operation 685SE and 685SR piston actuators utilize a piston that moves inside of a cylinder to generate thrust. A seal contained on the circumference of the piston provides a seal between the piston and the cylinder, preventing supply pressure leakage.
  • Page 4 Instruction Manual 685SE/685SR Piston Actuator June 2017 D103799X012 Table 3. Pressure Connections SUPPLY CONNECTION ACTUATOR SIZE Size, NPT Quantity (Top/Bottom) 2/2 (standard) 2/2 (standard) 3/4 (standard), 1, or 1­1/4 2/2 (standard) 14 to 28 3/4 (standard), 1, or 1­1/4 2/2 (standard for 3/4 NPT only) Table 4.
  • Page 5 Instruction Manual 685SE/685SR Piston Actuator June 2017 D103799X012 Table 5. Approximate Weights for Constructions with Handwheels MAX VALVE TRAVEL APPROXIMATE WEIGHT FOR ACTUATOR SIZE, kg (lbs) ACTUATOR TYPE mm (inches) 25 (1.00) 167 (369) 212 (468) 336 (742) 381 (839)

  • Page 6: Installation

    4­way solenoid valve or a switching valve. Pressure connection locations are indicated below: D 685SE Actuators: Side of the outer spring cartridge and bottom of the lower head. D 685SR Actuators: Top of the upper head and side of the outer spring cartridge.

  • Page 7: Actuator Mounting

    3, 4, 5, and 6. CAUTION The 685SE actuator spring load will force the piston rod to extend out of the cylinder, and it can come into contact with the valve stem during actuator mounting.

  • Page 8: Handwheel Operation

    Instruction Manual 685SE/685SR Piston Actuator June 2017 D103799X012 7. If the total travel is adequate, tighten the stem connector (key 18) securely, lock the stem locknuts (if present) against the connector, and adjust the indicator scale (key 22) on the yoke (key 21) to show valve plug position.

  • Page 9: Maintenance

    Instruction Manual 685SE/685SR Piston Actuator June 2017 D103799X012 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 Table 7.

  • Page 10: Actuator Removal

    The following procedure is for the removal of the actuator from a valve. For 685SE actuators only: It may be necessary to apply a temporary loading pressure to the bottom cylinder pressure connection to move the piston rod away from the valve stem during removal. If it is not possible to provide a temporary loading pressure, exercise caution when removing the actuator to prevent damage to the valve stem or piston rod.
  • Page 11 Instruction Manual 685SE/685SR Piston Actuator June 2017 D103799X012 1. Remove the lower head (key 9) from the yoke (key 21) by removing hex head cap screws (key 20) and lock washers (key 10). 2. Loosen tie bolt hex nuts (key 11) in a crisscross pattern. Remove tie rod hex nuts and lock washers (key 10).

  • Page 12: 685Sr Seal And O-Ring Replacement

    Instruction Manual 685SE/685SR Piston Actuator June 2017 D103799X012 Table 8. Tie Bolt Torque TORQUE BOLT DIAMETER N•m lbf•ft 1/4­20 5/16­18 3/8­16 7/16­14 1/2­13 9/16­12 5/8­11 3/4­10 7/8­9 1­8 1­1/8­7 685SR Seal and O­ring Replacement The following procedure is for the replacement of the internal piston seals, bearing seals, and O­rings.

  • Page 13: 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 14: Parts List

    Hex Head Cap Screw Yoke Travel Scale Outer Spring Cartridge Inner Spring Cartridge Spring Cartridge Wear Ring Spring Stem Connector Hex Nut Stem Connector Stud 100* 685SE/SR Actuator Grease (10 ounce tube) see parts kit (19B0808X222) *Recommended spare parts...
  • Page 15 Instruction Manual 685SE/685SR Piston Actuator June 2017 D103799X012 Figure 3. Fisher 685SE Piston Actuator LIFTING POINTS 7606...
  • Page 16 Instruction Manual 685SE/685SR Piston Actuator June 2017 D103799X012 Figure 4. Fisher 685SR Piston Actuator 7607...
  • Page 17 Instruction Manual 685SE/685SR Piston Actuator June 2017 D103799X012 Figure 5. Fisher 685SE Piston Actuator with Manual Handwheel RIGHT SIDE VIEW LEFT SIDE VIEW FRONT VIEW S24861...
  • Page 18 Instruction Manual 685SE/685SR Piston Actuator June 2017 D103799X012 Figure 6. Fisher 685SR Piston Actuator with Manual Handwheel LEFT SIDE VIEW RIGHT SIDE VIEW FRONT VIEW S24862...
  • Page 19 Instruction Manual 685SE/685SR Piston Actuator June 2017 D103799X012...
  • Page 20 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.

This manual is also suitable for:

685sr

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