Fisher 2625 User Manual

www.Fisher.com
Fisher
™
2625, 2625SST, and 2625NS Volume
Boosters
Contents
Introduction 1.................................
Scope of Manual 1..............................
Description 2..................................
Specifications 2................................
Educational Services 3...........................
Installation 4..................................
Mounting 5..................................
Pressure Connections 5........................
Diagnostic Connections 6......................
Supply Pressure 7.............................
Exhaust Ports 7...............................
Operating Information 7.........................
Principle of Operation 8.........................
Maintenance 8.................................
Diaphragm Assembly Replacement 8.............
Valve Assembly Replacement 9..................
Installation of Diagnostic Connections 10.........
Parts Ordering 11...............................
Parts Kits 11...................................
Parts List 11...................................
Figure 1. Fisher 2625 Volume Booster
W4727-1
Introduction
Scope of Manual
This instruction manual provides installation, operation, maintenance, and parts information for Fisher 2625,
2625SST, and 2625NS volume boosters (figure 1). Refer to separate instruction manuals for information regarding the
valve body, actuator, and other accessories.
Do not install, operate, or maintain a 2625, 2625SST, or 2625NS volume booster 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 of the contents of this manual, including
all safety cautions and warnings. If you have any questions regarding these instructions contact your Emerson sales
office or Local Business Partner before proceeding.
Instruction Manual
D100348X012
2625, 2625SST, and 2625NS Volume Booster
May 2017

Fisher 2625 Specifications

General

Brand	Fisher
Model	2625
Category	Extender
Language	English

Summary

Introduction

Scope of Manual

Provides an overview of the manual's content, covering installation, operation, maintenance, and parts for the volume boosters.

Description

Specifications

Educational Services

Installation

Mounting

Details how the volume booster is typically mounted between the pneumatic supply source and the actuator.

Pressure Connections

Describes the input, supply, and output connection types and sizes for the volume booster.

Diagnostic Connections

Explains how to install connectors for diagnostic testing of valve/actuator/positioner packages.

Supply Pressure

Specifies requirements for clean, dry, noncorrosive gas supply and recommended filtration.

Exhaust Ports

Covers exhaust port function, maintenance, and options for remote venting.

Operating Information

Principle of Operation

Maintenance

Diaphragm Assembly Replacement

Step-by-step guide for replacing the diaphragm assembly, including part inspection and reassembly.

Valve Assembly Replacement

Instructions for replacing the valve assembly, emphasizing critical dimensions and factory-set components.

Installation of Diagnostic Connections

Details the process for assembling and installing diagnostic connection hardware.

Parts Ordering

Parts Kits

Lists available repair kits for diaphragms and valve assemblies for different booster models.

Parts List

Provides a list of parts with corresponding key numbers and descriptions for the volume booster assembly.