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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
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