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Fisherr 685SE and 685SR Piston Actuator

Contents

Introduction 1.................................

Scope of Manual 1.............................

Description 1.................................

Specifications 2...............................

Principle of Operation 3.........................

Installation 6..................................

Three-Way Valve Applications Note 6.............

Actuator Mounting 7..........................

Handwheel Operation 8.........................

Maintenance 9.................................

Actuator Removal 9...........................

685SE Seal and O-ring Replacement 10...........

685SR Seal and O-ring Replacement 12...........

Parts Ordering 14...............................

Parts Kits 14...................................

Parts List 15...................................

Figure 1. Fisher 685SE Piston Actuator

X0993

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 p ersonal 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.

Description

The 685SE and 685SR are medium to large springreturn doubleacting 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 slidingstem control valves including the easye™, 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 s upply pressure, thereby ensuring a failclosed or failopen mode of operation. This effectively

eliminates the need for a trip valve and volume tank in most constructions.

Instruction Manual

D103799X012

685SE/685SR Piston Actuator

September 2014

Summary of content (20 pages)

PAGE 1
Instruction Manual 685SE/685SR Piston Actuator D103799X012 September 2014 Fisherr 685SE and 685SR Piston Actuator Contents Figure 1. Fisher 685SE Piston Actuator Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Principle of Operation . . .
PAGE 2
Instruction Manual 685SE/685SR Piston Actuator D103799X012 September 2014 Table 1. Specifications Operating Pressure(1) Minimum: 2.7 bar (40psig) Maximum Allowable: 10.3 bar (150 psig) Consult your Emerson Process Management sales office for supply pressures under 2.7 bar (40 psi) Travel(2) 25 mm (1 inch) through 610 mm (24 inch).
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Instruction Manual 685SE/685SR Piston Actuator D103799X012 September 2014 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. A bias spring that is either below or above the piston, depending on construction, will retract or extend the piston rod upon a loss of supply pressure.
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Instruction Manual 685SE/685SR Piston Actuator D103799X012 September 2014 Table 3. Pressure Connections SUPPLY CONNECTION ACTUATOR SIZE Size, NPT 10 3/8 12 3/4 Quantity (Top/Bottom) 1/1 2/2 (standard) 1/1 2/2 (standard) 1/1 3/4 (standard), 1, or 11/4 2/2 (standard) 14 to 28 1/1 3/4 (standard), 1, or 11/4 2/2 (standard for 3/4 NPT only) Table 4.
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Instruction Manual 685SE/685SR Piston Actuator D103799X012 September 2014 Table 5. Approximate Weights for Constructions with Handwheels ACTUATOR TYPE MAX VALVE TRAVEL 685SE 685SR APPROXIMATE WEIGHT FOR ACTUATOR SIZE, kg (lbs) mm (inches) 10 12 14 16 18 20 22 24 26 25 (1.00) 167 (369) 212 (468) 336 (742) 381 (839) 432 (953) 603 (1330) 675 (1489) 853 (1881) 941 (2075) 51 (2.
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85SE/685SR Piston Actuator September 2014 Instruction Manual D103799X012 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 pressureretaining parts, be certain the cylinder pressure or other pressure ratings do not exceed the limits listed in table 1.
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Instruction Manual D103799X012 685SE/685SR Piston Actuator September 2014 Actuator Mounting The following procedure describes how to mount a 685SE or 685SR actuator on a push-down-to-close valve so that the piston rod to valve plug stem connection allows full travel and proper shutoff. Key numbers referenced in the following steps are shown in figures 2, 3, 4, and 5.
PAGE 8
685SE/685SR Piston Actuator Instruction Manual September 2014 D103799X012 connector slightly, tightening the locknuts together, and (with the valve plug off the seat) screwing the stem connector either into or out of the stem connector by means of a wrench on the locknuts. 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. 8.
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Instruction Manual 685SE/685SR Piston Actuator D103799X012 September 2014 Table 7. Handwheel Specifications OUTPUT THRUST ACTUATOR SIZE HANDWHEEL DIAMETER TURNS PER mm OF TRAVEL TURNS PER INCH OF TRAVEL MAXIMUM RIM FORCE REQUIRED N lbs N lbs mm Inch 10 to 12 44482 10000 305 12 3.8 96 290 14 to 18 88964 20000 406 16 3.0 80 380 85 20 to 26 133447 30000 610 24 2.8 72 450 100 65 Maintenance WARNING Avoid personal injury from sudden release of process pressure.
PAGE 10
685SE/685SR Piston Actuator Instruction Manual September 2014 D103799X012 1. Disconnect the actuator tubing from the pressure connections on the upper/lower head and outer spring cartridge (keys 1/9 and 23) and positioner. Note Refer to the appropriate instruction manual for any maintenance or adjustments that need to be made on the positioner.
PAGE 11
Instruction Manual 685SE/685SR Piston Actuator D103799X012 September 2014 8. Loosen tie bolt hex nuts (key 11) in a crisscross pattern. Remove tie rod hex nuts and lock washers (key 10). 9. Remove lower head (key 9) from cylinder (key 4) and place the Oring side down onto wooden blocks or other material that will not scratch or gouge the lower head. 10. Extract bearing assembly (keys 12, 13, 14, and 15) from lower head (key 9) by removing the bearing retaining ring (key 16). 11.
PAGE 12
Instruction Manual 685SE/685SR Piston Actuator D103799X012 September 2014 cylinder assembly to screw the engage/disengage block (key 43) onto the piston rod (key 17) until the gap measured in step 2 is achieved. 35. Tighten the set screw (key 36) into the engage/disengage block (key 43). 36. Secure the cylinder assembly to the yoke using the hex head cap screws (key 20) and lock washers (key 10). Torque in a crisscross pattern according to table 8. 37.
PAGE 13
Instruction Manual 685SE/685SR Piston Actuator D103799X012 September 2014 10. Thread a suitable lifting eye into the free port on the top of the piston rod (key 17). 11. Lift or hoist the piston assembly (keys 5, 6, 7, 17, and 19) out from cylinder (key 4) and place on a flat surface upside down. 12. Remove the wear ring (key 6) and quad seal (key 7) from the piston (key 5). 13. Thread locking compound is applied to the threads by the manufacturer during initial assembly.
PAGE 14
Instruction Manual 685SE/685SR Piston Actuator D103799X012 September 2014 Parts Ordering When corresponding with your Emerson Process Management sales office about this equipment, refer to the serial number found on the actuator nameplate. Also, specify the complete 11character part number from the following Parts List when ordering replacement parts. WARNING Use only genuine Fisher replacement parts.
PAGE 15
Instruction Manual 685SE/685SR Piston Actuator D103799X012 September 2014 Parts List Manual Handwheel Parts (figures 4 and 5) Note For part numbers not shown, contact your Emerson Process Management sales office.
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685SE/685SR Piston Actuator September 2014 Instruction Manual D103799X012 Figure 2.
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Instruction Manual D103799X012 685SE/685SR Piston Actuator September 2014 Figure 3.
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Instruction Manual 685SE/685SR Piston Actuator D103799X012 September 2014 Figure 4.
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Instruction Manual 685SE/685SR Piston Actuator D103799X012 September 2014 Figure 5.
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685SE/685SR Piston Actuator September 2014 Instruction Manual D103799X012 Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product. 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.