Data Sheet

ManualsBrandsEmerson ManualsPneumatic ActuatorsEmerson Fisher 685

www.Fisher.com

Fisherr 685 Piston Actuator

The 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.

The 685 family is available in several configurations to

cover a wide range of application requirements.

Typical travels range from 25 to 610 mm (1 to 24

inches) and cylinder diameters range from 305 to 660

mm(12to26inches).Thrustcapabilitiesextendto

354 kN (79,000 lbf) and above with special

constructions.

The 685 can be used with the FIELDVUE™ DVC6200

digital valve controller for throttling applications, or

with switching valves for onoff control. This actuator

can also be fitted with volume boosters for fast

stroking requirements.

Features

 High Thrust Capability — Maximum thrusts of up to

354 kN (79,000 lbf) can be produced.

 Broad Application Coverage — Standard

constructions offer travels of up to 610 mm (24

inches) and cylinder diameters of up to 660 mm (26

inches). Even larger c onstructions are available

upon request.

 Low Friction — Low friction piston seals and either

chrome plated or fluoropolymer coated cylinder

bores reduce sliding friction and wear.

X0922

 Wide Temperature Range — Standard constructions

offer a temperature range of -40 to 93_C(-40to

200_F), however higher or lower temperatures are

possible. Special constructions can operate as low

as -54_C(65_F)andashighas204_C(400_F).

 Manual Override — An optional side-mounted

handwheel is capable of extending or retracting the

actuator manually and can be engaged at any

position from full open to full closed.

685 Piston Actuator

D103625X012

Product Bulletin

61.2:685

September 2014

Summary of content (12 pages)

PAGE 1
Product Bulletin 685 Piston Actuator 61.2:685 September 2014 D103625X012 Fisherr 685 Piston Actuator The 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. The 685 family is available in several configurations to cover a wide range of application requirements.
PAGE 2
Product Bulletin 685 Piston Actuator 61.2:685 September 2014 D103625X012 Table 1. Specifications Operating Pressure(1) Minimum: 2.7 bar (40psig) Construction Materials Maximum Allowable: 10.3 bar (150 psig) Consult your Emerson Process Management sales office for supply pressures under 2.
PAGE 3
685 Piston Actuator D103625X012 Product Bulletin 61.2:685 September 2014 Principle of Operation actuator cylinder or piston is removed for maintenance. 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.
PAGE 4
Product Bulletin 685 Piston Actuator 61.2:685 September 2014 D103625X012 Figure 1. Fisher 685 Piston Actuator PRESSURE CONNECTIONS (TOP AND BOTTOM) PISTON WEAR RING PISTON QUAD SEAL TIE RODS PISTON CYLINDER PISTON ROD MOUNTING BOSSES BEARING ASSEMBLY BEARING RETAINING RING VALVE STEM CONNECTOR YOKE X0923 Table 2.
PAGE 5
Product Bulletin 685 Piston Actuator 61.2:685 September 2014 D103625X012 Table 4.
PAGE 6
Product Bulletin 685 Piston Actuator 61.2:685 September 2014 D103625X012 Figure 2.
PAGE 7
Product Bulletin 685 Piston Actuator 61.2:685 September 2014 D103625X012 Figure 3.
PAGE 8
Product Bulletin 685 Piston Actuator 61.2:685 September 2014 D103625X012 Table 7. Dimensions A, G, and H A ACTUATOR SIZE G H mm Inch mm Inch mm Inch 12 381 15.00 338 13.31 235 9.25 14 432 17.00 435 17.13 253 9.98 16 489 19.25 435 17.13 253 9.98 18 543 21.38 435 17.13 253 9.98 20 591 23.25 581 22.88 434 17.10 22 654 25.75 581 22.88 434 17.10 24 711 28.00 584 23.00 484 19.06 26 775 30.50 584 23.00 484 19.06 Table 8.
PAGE 9
Product Bulletin 685 Piston Actuator 61.2:685 September 2014 D103625X012 Table 10. Dimensions C and AR (Actuator Removal Clearance) WITHOUT MANUAL OVERRIDE ACTUATOR SIZE 12 14, 16, and 18 20 and 22 MAXIMUM VALVE TRAVEL C WITH MANUAL OVERRIDE AR (Actuator Removal Clearance) 7 Inch Yoke 5H Yoke Boss Boss mm Inch mm Inch C AR (Actuator Removal Clearance) 7 Inch Yoke 5H Yoke Boss Boss mm Inch mm Inch mm Inch mm Inch 7 Inch Yoke Boss mm Inch mm Inch 7 Inch Yoke Boss mm Inch 267 10.
PAGE 10
Product Bulletin 685 Piston Actuator 61.2:685 September 2014 D103625X012 Table 10. Dimensions C and AR (Actuator Removal Clearance) (continued) WITHOUT MANUAL OVERRIDE ACTUATOR SIZE 24 and 26 10 MAXIMUM VALVE TRAVEL C WITH MANUAL OVERRIDE AR (Actuator Removal Clearance) 7 Inch Yoke 5H Yoke Boss Boss mm Inch mm Inch C AR (Actuator Removal Clearance) 7 Inch Yoke 5H Yoke Boss Boss mm Inch mm Inch mm Inch mm Inch 7 Inch Yoke Boss mm Inch mm Inch 7 Inch Yoke Boss mm Inch 102 4.00 794 31.
PAGE 11
Product Bulletin 685 Piston Actuator 61.2:685 September 2014 D103625X012 Table 11. Approximate Weights for Constructions without Handwheels MAXIMUM VALVE TRAVEL mm (inches) APPROXIMATE WEIGHT FOR ACTUATOR SIZE, kg (lbs) 12 14 16 18 102 (4.00) 203 (8.00) 20 22 24 26 402 (886) 475 (1048) 662 (1459) 761 (1677) 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.
PAGE 12
Product Bulletin 61.2:685 September 2014 685 Piston Actuator D103625X012 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.