Fisher 657 User Manual

www.Fisher.com
Fisher
r
657 Diaphragm Actuators
Size 80 and 100
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 2.................................
Specifications 3...............................
Installation 3...................................
Actuator Mounting 3...........................
Loading Connection 4......................
Adjustments 4.................................
Travel 4......................................
Spring 5.....................................
Size 80 5.................................
Size 100 5................................
Maintenance 7.................................
Actuator 7...................................
Size 80 Disassembly 7......................
Size 80 Assembly 8.........................
Size 100 Disassembly 10....................
Size 100 Assembly 11.......................
Size 80 Side‐Mounted Handwheel 12.............
Disassembly 12............................
Assembly 13..............................
Size 80 Hydraulic Snubber 13....................
Size 80 Top‐Mounted Handwheel
(Adjustable Up Travel Stop) 13................
Disassembly 14............................
Assembly 14..............................
Size 100 Top‐Mounted Handwheel
(Adjustable Up Travel Stop) 14................
Disassembly 15............................
Figure 1. Sectional view of Fisher 657
Size 100 Actuator
W0366‐1
Assembly 15..............................
Parts Ordering 15...............................
Parts List 16...................................
Introduction
Scope of Manual
This instruction manual provides information on installation, adjustment, maintenance, and parts ordering for the
Fisher 657 actuator in sizes 80 and 100. Refer to separate instruction manuals for information about other equipment
and accessories used with these actuators.
Do not install, operate, or maintain 657 actuators 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.
Instruction Manual
D100307X012
657 Size 80 and 100 Actuators
December 2010

Fisher 657 Specifications

General

Brand	Fisher
Model	657
Category	Controller
Language	English

Summary

Introduction

Scope of Manual

Provides information on installation, adjustment, maintenance, and parts ordering for Fisher 657 actuators.

Description

Specifications

Maximum Pressure Limitations

Explains maximum casing and diaphragm pressure limitations for actuators, including a warning.

Installation

Actuator Mounting

Details procedures for mounting the actuator onto the valve body, including specific steps for size 100.

Loading Connection

Describes how to connect loading pressure piping to the diaphragm casing and check for correct stem travel.

Adjustments

Actuator Travel Adjustment

Explains how to adjust actuator stem travel when it differs from the nameplate specification.

Actuator Spring Adjustment

Guides on making spring adjustments to match loading pressure ranges to specified actuator travel for Size 80 and Size 100.

Maintenance

Actuator Disassembly and Assembly

Outlines procedures for complete disassembly and assembly of the actuator for inspection or repairs.

Size 80 Side-Mounted Handwheel

Covers disassembly and assembly of the side-mounted handwheel assembly for manual operation.

Size 80 Hydraulic Snubber

Explains the hydraulic snubber for dampening actuator stem instability and its adjustment.

Size 80 Top-Mounted Handwheel

Describes the top-mounted handwheel used as an adjustable up-travel stop.

Size 100 Top-Mounted Handwheel

Details the function of the top-mounted handwheel as an adjustable up-travel stop for the size 100 actuator.

Parts Ordering

Parts List