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Instruction Manual
D103626X012
Fisherr 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 Emerson Process Management sales office before
proceeding.
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Figure 1. Fisher 685 Piston Actuator
X0709
685 Piston Actuator
May 2013
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Table of Contents
Related Manuals for Fisher 685
Summary of Contents for Fisher 685
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Page 1: Table Of Contents
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. -
Page 2: Description
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: Principle Of Operation
This enables the manual override to reposition the control valve even if the actuator cylinder or piston is removed for maintenance. Specifications Specifications for 685 piston actuators are given in table 1. Refer to the nameplate affixed to the actuator yoke for specifications specific to individual constructions. - Page 4 Instruction Manual 685 Piston Actuator D103626X012 May 2013 Table 4. Approximate Weights for Constructions without Handwheels Maximum Approximate Weight for Actuator Size, KG (LBS) Valve Travel, inches 385 (848) 457 (1007) 637 (1404) 734 (1617) 392 (864) 464 (1023) 647 (1426)
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Page 5: Installation
Instruction Manual 685 Piston Actuator D103626X012 May 2013 Installation WARNING Always wear protective gloves, clothing, and eyewear when performing any installation operations to avoid personal injury. To avoid personal injury or property damage caused by bursting of pressure-retaining parts, be certain the cylinder pressure or other pressure ratings do not exceed the limits listed in table 1. -
Page 6: Actuator Mounting
2 and 3. 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: Maintenance
Instruction Manual 685 Piston Actuator D103626X012 May 2013 1. Open the bypass valve. 2. Rotate the handwheel (key 45) to position the override engage pin (key 38) with the hole in the stem connector (key 10). Turn the engage pin control knob (key 33) clockwise to insert the override engage pin into the stem connector until it stops. -
Page 8: Actuator Removal
Instruction Manual 685 Piston Actuator D103626X012 May 2013 Actuator Removal The following procedure is for the removal of the actuator from a valve. 1. Disconnect the cylinder tubing from the upper and lower heads (keys 1 and 9) and positioner. - Page 9 Instruction Manual 685 Piston Actuator D103626X012 May 2013 19. Without grease, trim to length and then install a new wear seal (key 6). 20. Lift cylinder (key 4) vertically and place on a flat surface. Take extra precaution to avoid scratching or gouging the inner diameter of the cylinder.
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Page 10: Parts Ordering
Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Process Management 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 11 Instruction Manual 685 Piston Actuator D103626X012 May 2013 Parts List Manual Handwheel Parts (figure 3) Description Note Stop Adjusting Bolts Part numbers are shown for recommended spares only. For part ACME Thrust Shaft numbers not shown, contact your Emerson Process Management sales Override Guide Shaft office.
- Page 12 Instruction Manual 685 Piston Actuator D103626X012 May 2013 Figure 2. Fisher 685 without Manual Handwheel...
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Page 13: D103626X012 May
Instruction Manual 685 Piston Actuator D103626X012 May 2013 Figure 3. Fisher 685 with Manual Handwheel LEFT SIDE VIEW FRONT VIEW RIGHT SIDE VIEW... - Page 14 Instruction Manual 685 Piston Actuator D103626X012 May 2013...
- Page 15 Instruction Manual 685 Piston Actuator D103626X012 May 2013...
- 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 Process Management business unit of Emerson Electric Co. Emerson Process Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co.