Emerson 685SE Datasheet download pdf

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Fisherr 685SE and 685SR Piston Actuators

The685SEand685SRaremediumtolarge

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 supply 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.

Several configurations are available 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 254 to 711 mm (10 to 28

inches).

The 685SE and 685SR 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, when supply

pressure is available.

 Broad Application Coverage — Standard

constructions offer travels of up to 610 mm (24

inches) and cylinder diameters of up to 711 mm

(28 inches). Even larger constructions are available

upon request.

 Low Friction — Low friction piston seals and either

chrome plated or fluoropolymer coated cylinder

bores reduce sliding friction and wear.

X0993

 Double Acting Construction — Pressure on both

sides of the piston results in stiff, precise

positioning.

 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).

 Mechanical Fail Mode — Depending on construction,

an internal bias spring will force the piston rod to

retract or extend upon a loss of supply pressure.

 Manual Override — An optional side-mounted

handwheel or hydraulic hand-pump is capable of

extending or retracting the actuator manually and

can be engaged at any position from full open to full

closed.

685SE and 685SR Actuators

D103791X012

Product Bulletin

61.2:685SE/685SR

September 2014

1 2 3 4 5 6 ... 11 12

Summary of Contents

Page 1 - Features

www.Fisher.comFisherr 685SE and 685SR Piston ActuatorsThe685SEand685SRaremediumtolargespring-return, double-acting piston actuators thatprovide accura

Page 2

685SE and 685SR ActuatorsD103791X012Product Bulletin61.2:685SE/685SRSeptember 201410Figure 3. Fisher 685SR Actuator DimensionsFRONT VIEW OF ACTUATORWI

Page 3 - Principle of Operation

685SE and 685SR ActuatorsD103791X012Product Bulletin61.2:685SE/685SRSeptember 201411Table 7. Actuator Removal Clearance (AR)MAXIMUM VALVETRAVELAR (WIT

Page 4 - Instrument Selection

685SE and 685SR ActuatorsD103791X012Product Bulletin61.2:685SE/685SRSeptember 201412Table 10. Approximate Weights for Constructions with HandwheelsACT

Page 5

685SE and 685SR ActuatorsD103791X012Product Bulletin61.2:685SE/685SRSeptember 20142Table 1. S pecificationsOperating Pressure(1)Minimum: 2.7 bar (40ps

Page 6

685SE and 685SR ActuatorsD103791X012Product Bulletin61.2:685SE/685SRSeptember 20143Figure 1. Fisher 685SE Piston ActuatorX0992TIE RODSCYLINDERMOUNTING

Page 7

685SE and 685SR ActuatorsD103791X012Product Bulletin61.2:685SE/685SRSeptember 20144Instrument SelectionAn excellent selection of sensitive and accurat

Page 8

685SE and 685SR ActuatorsD103791X012Product Bulletin61.2:685SE/685SRSeptember 20145Table 3. Supply ConnectionsACTUATOR SIZESUPPLY CONNECTIONSize, NPT

Page 9

685SE and 685SR ActuatorsD103791X012Product Bulletin61.2:685SE/685SRSeptember 20146Table 6. Dimensions B and CACTUATORSIZEMAXIMUMVALVE TRAVELMAXIMUMBC

Page 10 - Product Bulletin

685SE and 685SR ActuatorsD103791X012Product Bulletin61.2:685SE/685SRSeptember 20147Table 6. Dimensions B and C (continued)ACTUATORSIZEMAXIMUM VALVETRA

Page 11

685SE and 685SR ActuatorsD103791X012Product Bulletin61.2:685SE/685SRSeptember 20148Table 6. Dimensions B and C (continued)ACTUATORSIZEMAXIMUM VALVETRA

Page 12

685SE and 685SR ActuatorsD103791X012Product Bulletin61.2:685SE/685SRSeptember 20149Figure 2. Fisher 685SE Actuator DimensionsFRONT VIEW OF ACTUATORWIT

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Emerson 685SE Datasheet

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