Emerson Fisher 685 Installation Instructions

Instruction Manual

D103626X012

Fisherr 685 Piston Actuator

685 Piston Actuator

September 2014

Contents

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

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

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

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

Educational Services 3.........................

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

Installation 5..................................

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

Actuator Mounting 6..........................

Handwheel Operation 7.........................

Maintenance 8.................................

Actuator Removal 8...........................

Seal and O-ring Replacement 9..................

Parts Ordering 11...............................

Parts Kit 11....................................

Parts List 12...................................

Figure 1. Fisher 685 Piston Actuator

X0922

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.

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 easye™, FB, TBX, HP, EH, and 461.

www.Fisher.com

685 Piston Actuator

September 2014

Table 1. Specifications

Instruction Manual

D103626X012

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)

Pressure Connections

Standard: 3/4 NPT
Optional: 1and11/4 NPT

Instrument Mounting

Mounting kits are available for use with the FIELDVUE

(2)

Travel

25 mm (1 inch) through 610 mm (24 inch)
See table 2

Thrust Capabilities

See table 3

Piston Diameter and Area

(2)

DVC6200 series positioner

Construction Materials

PART MATERIAL

Yoke ASTM A36 (steel)

Piston ASTM A36 (steel)

Cylinder 305 to 559 mm (12 to 22 inch) Cylinder:

Available in 51 mm (2 inch) increments between 305
mm (12 inch) and 660 mm (26 inch)
See table 2

Operative Temperature Limits

Standard: 40 to 93_C(40 to 200_F)
Low Temperature: 54 to 93_C(65 to 200_F)
High Temperature: 29 to 204_C(20 to 400_F)

(3)

(3)

Upper/Lower Heads ASTM A36 (steel)

Tie Bolt ASTM A311 1045, Class B (steel)

Piston Rod S31603 (316L stainless steel)

Stem Connector ASTM A36 (steel)

Weights

Yoke Boss and Valve Stem Diameter

J 127mm(5Hinch)yokebosswith32mm(1-1/4
inch) stem J 178mm(7inch)yokebosswith51mm
(2 inch) stem

1. The pressure/temperature limits in this bulletin and any other applicable standard or code should not be exceeded.

2. Consult factoryfor larger travels or cylinder diameters. The Fisher 585C family ofactuators are availablefor smaller travels or cylinder diameters.

3. Consult factoryfor applications requiringlow or high temperaturerequirements.

See tables 4 and 5

Lifting Point Load Ratings

See table 6

1026 DOM (steel) with chrome-plated

bore

610 to 660 mm (24 to 26 inch) Cylinder:

ASTM A516 Grade 70 (steel) with

fluoropolymer coated bore

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.

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Instruction Manual

D103626X012

685 Piston Actuator

September 2014

Educational Services

For information on available courses for Fisher 685 piston actuators, as well as a variety of other products, contact:

Emerson Process Management
Educational Services - Registration
Phone: [phone] or 1-800-338-8158
E-mail: [e-mail]
http://www.emersonprocess.com/education

Principle of Operation

685 piston actuators utilize a pneumatically controlled 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.

From an equilibrium state, the actuator operates by reacting to a force unbalance that is created by increasing supply
pressure on one side of the piston, and decreasing it on the other. This moves the piston up or down, and results in a
repositioning of the attached control valve. Travel can be adjusted using travel limits within a valve positioner, which
limit the travel range of the actuator. The optional handwheel manual override does not have the ability to act as a
hard travel stop.

An optional handwheel manual override is capable of extending or retracting the actuator manually and can be
engaged at any position from full open to full close. This override utilizes a worm gear assembly that is attached to the
stem connector and not attached to the cylinder or piston rod. This enables the manual override to reposition the
control valve even if the actuator cylinder or piston is removed for maintenance.

Table 2. Standard Constructions

ACTUATOR

SIZE

12 305 16 730 32or 51 127 or 178 >203 610

14 356 32 993 32or 51 127 or 178 >203 610

16 406 32 1297 32 or 51 127 or 178 >203 610

18 457 32 1642 32 or 51 127 or 178 >203 610

20 508 46 2027 32 or 51 127 or 178 25 610

22 559 46 2452 32 or 51 127 or 178 25 610

24 610 62 2919 32 or 51 127 or 178 25 610

26 660 62 3425 32 or 51 127 or 178 25 610

12 12 2.41 113 1-1/4 or 2 5H or 7 >8 24

14 14 4.91 154 1-1/4 or 2 5H or 7 >8 24

16 16 4.91 201 1-1/4 or 2 5H or 7 >8 24

18 18 4.91 254 1-1/4 or 2 5H or 7 >8 24

20 20 7.07 314 1-1/4 or 2 5H or 7 1 24

22 22 7.07 380 1-1/4 or 2 5H or 7 1 24

24 24 9.62 452 1-1/4 or 2 5H or 7 1 24

26 26 9.62 531 1-1/4 or 2 5H or 7 1 24

1. Consult your Emerson Process Management sales office for additional sizes.

PISTON

DIAMETER

(1)

PISTON ROD

AREA

PISTON AREA

mm (cm2for Area)

Inches (inch2for Area)

VALVE STEM

CONNECTOR SIZE

YOKE BOSS

DIAMETER

VALVE TRAVEL

Minimum Maximum

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685 Piston Actuator

September 2014

Instruction Manual

D103626X012

Table 3. Thrust

THRUST AT SUPPLY PRESSURE, N (LBF)

ACTUATOR SIZE STROKE

12
14 41083 (9236) 54777 (12315) 68472 (15394) 102707 (23091)
16 53659 (12064) 71546 (16085) 89432 (20106) 134149 (30159)
18 67913 (15268) 90550 (20358) 113188 (25447) 169782 (38170)
20 83843 (18850) 111790 (25133) 139738 (31416) 209607 (47124)
22 101450 (22808) 135266 (30411) 169083 (38013) 253625 (57020)
24 120734 (27143) 160978 (36191) 201223 (45239) 301834 (67858)
26 141694 (31856) 188926 (42474) 236157 (53093) 354236 (79639)
12
14 39773 (8942) 53030 (11922) 66288 (14903) 99432 (22354)
16 52349 (11769) 69799 (15692) 87248 (19615) 130873 (29423)
18 66602 (14974) 88803 (19965) 111004 (24956) 166506 (37434)
20 81956 (18425) 109275 (24567) 136593 (30709) 204890 (46063)
22 99563 (22384) 132751 (29845) 165938 (37306) 248907 (55959)
24 118166 (26566) 157555 (35422) 196944 (44277) 295416 (66415)
26 139127 (31279) 185503 (41705) 231878 (52131) 347817 (78196)

1. Consult your Emerson Process Management sales office for supply pressures below 40 psig.

2. Maximum available thrust.

Push

Pull

4.1 barg (60 psig) 5.5 barg (80 psig) 6.9 barg (100 psig)

30183 (6786) 40245 (9048) 50306 (11310) 75459 (16965)

29540 (6641) 39387 (8855) 49234 (11069) 73851 (16603)

(1)

10.3 barg

(150 psig)

Table 4. Approximate Weights for Constructions without Handwheels

MAXIMUM

VALVE TRAVEL

mm (inches) 12 14 16 18 20 22 24 26

102 (4.00) 402 (886) 475 (1048) 662 (1459) 761 (1677)

203 (8.00) 430 (947) 505 (1114) 702 (1548) 804 (1771)
305 (12.00) 157 (346) 245 (541) 292 (643) 337 (742) 457 (1008) 535 (1180) 743 (1637) 847 (1866)

406 (16.00) 168 (370) 262 (577) 311 (686) 358 (789) 485 (1069) 565 (1246) 783 (1726) 889 (1961)

508 (20.00) 179 (395) 278 (614) 331 (729) 379 (836) 512 (1129) 595 (1311) 823 (1815) 932 (2056)

610 (24.00) 190 (420) 295 (650) 350 (773) 401 (883) 540 (1190) 625 (1377) 864 (1904) 975 (2150)

APPROXIMATE WEIGHT FOR ACTUATOR SIZE, kg (lbs)

(2)

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Instruction Manual

D103626X012

685 Piston Actuator

September 2014

Table 5. Approximate Weights for Constructions with Handwheels

MAXIMUM

VALVE TRAVEL

mm (inches) 12 14 16 18 20 22 24 26

102 (4.00) 591 (1304) 664 (1463) 834 (1838) 925 (2038)

203 (8.00) 622 (1372) 696 (1535) 873 (1924) 965 (2128)

305 (12.00) 226 (499) 363 (800) 292 (643) 454 (1000) 653 (1440) 729 (1607) 912 (2010) 1006 (2218)

406 (16.00) 239 (527) 380 (838) 311 (686) 474 (1046) 684 (1508) 762 (1679) 951 (2096) 1047 (2308)

508 (20.00) 252 (555) 397 (876) 331 (729) 495 (1092) 715 (1576) 794 (1751) 990 (2182) 1088 (2398)

610 (24.00) 264 (583) 415 (914) 350 (773) 516 (1138) 746 (1644) 827 (1823) 1029 (2268) 1129 (2488)

APPROXIMATE WEIGHT FOR ACTUATOR SIZE, kg (lbs)

Table 6. Lifting Point Load Ratings

ACTUATOR SIZE

12 to 24

26 2 2860 6300

12 to 24

26 2 6350 14000

LIFTING

ORIENTATION

Actuator Centerline

Horizontal

Actuator Centerline

Vertical

NUMBER OF LIFTING POINTS USED

2 1540 3400

2 3760 8300

MAXIMUM LOAD

kg lbs

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. Use pressure-limiting or pressure-relieving
devices to prevent cylinder pressure or other pressures from exceeding these limits.

Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.

If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.

Dropping the actuator and any attached accessories and/or valve may cause personal injury and/or equipment damage. For
all mounting procedures use an adequately sized chain, sling, hoist, or crane to handle the actuator and any attached
accessories and/or valve. Use caution during lifting and handling to prevent slippage, swinging, faulty equipment
connections, or sudden shock loads.

CAUTION

Special care must be taken when installing an actuator in a horizontal service orientation. To avoid cantilever loads on the
valve stem and yoke, it is the customer’s responsibility to ensure proper support for a horizontal actuator.

When an actuator and control valve are shipped together as a control valve assembly, the actuator is normally
mounted on the valve. Follow the valve instructions when installing the valve in the pipeline. If the actuator is shipped
separately or if it is necessary to mount the actuator on the valve, perform the actuator mounting procedures in this
instruction manual. Refer to the individual product instruction manuals for the installation or mounting of a FIELDVUE
DVC6200 digital valve controller or 3610 positioner.

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