Instruction Manual

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Fisherr 2625 and 2625NS Volume Boosters

Contents

Introduction 1.................................

Scope of Manual 1..............................

Description 1..................................

Specifications 2................................

Educational Services 3...........................

Installation 4..................................

Mounting 4..................................

Pressure Connections 5........................

Diagnostic Connections 6......................

Supply Pressure 6.............................

Exhaust Ports 7...............................

Operating Information 7.........................

Principle of Operation 7.........................

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 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 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 Process Management sales

office before proceeding.

Description

The 2625 is certified for use in Safety Instrumented System (SIS) applications. Certification is by EXIDA Consulting LLC,

a global provider of functional safety and control system security. SIS certification is identified on the product by the

EXIDA logo on the 2625 nameplate.

The 2625 and 2625NS volume boosters are used in conjunction with a positioner on a throttling control valve to

increase stroking speed. The booster has a fixed deadband (controlled by the seat‐to‐seat dimension of the supply and

Instruction Manual

D100348X012

2625 and 2625NS Volume Booster

January 2015

Summary of content (12 pages)

PAGE 1
Instruction Manual 2625 and 2625NS Volume Booster D100348X012 January 2015 Fisherr 2625 and 2625NS Volume Boosters Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Educational Services . . . . . . . . . . . . . . . . . . . . .
PAGE 2
625 and 2625NS Volume Booster January 2015 Instruction Manual D100348X012 exhaust plugs) which is factory set during assembly and testing. In addition, the booster incorporates soft‐seat construction and an integral bypass restriction to eliminate positioner saturation problems that can occur with volume boosters that do not have these features. Adjustment of the integral bypass restriction is necessary for system stability.
PAGE 3
Instruction Manual 2625 and 2625NS Volume Booster D100348X012 January 2015 Table 1. Specifications Port Diameters(1) Supply Port: J 9.5 mm (0.375 inch) or J 12.7 mm (0.5 inch) Exhaust Port: J 2.4 mm (0.094 inch), J 9.5 mm (0.375 inch) or J 12.7 mm (0.5 inch) Input Signal Positioner output Maximum Input Signal Pressure 10.
PAGE 4
Instruction Manual 2625 and 2625NS Volume Booster D100348X012 January 2015 Table 2. Maximum Flow Coefficients PORT SIZE COMBINATIONS Supply Port mm Exhaust Port Inch mm Inch SUPPLY PORT COEFFICIENTS EXHAUST PORT COEFFICIENTS Cv Cv 3.74 3.74 3.74 4.98 4.98 4.98 0.23 2.29 3.40 0.24 2.30 3.40 0.37 0.31 FIELDVUE DVC2000 digital valve controller Low Pressure Relay High Pressure Relay Fisher 3570 valve positioner 0.13 0.19 0.25 0.15 0.20 0.25 Fisher 3582 valve positioner 0.17 0.
PAGE 5
Instruction Manual 2625 and 2625NS Volume Booster D100348X012 January 2015 The booster may also be directly mounted to the actuator by using an actuator yoke mounting bracket (see figure 5) or casing mounting bracket. Pressure Connections The input signal connection is 1/4 NPT. The supply and output connections are 3/4 NPT (minimum pipe size recommended for nipple mounting is 1/2 NPT). Connections to the volume booster should be made as indicated in figure 3.
PAGE 6
Instruction Manual 2625 and 2625NS Volume Booster D100348X012 January 2015 Figure 3. Volume Booster Sectional View INPUT SIGNAL DIAPHRAGMS (KEY 5 AND 6) EXHAUST PORT BYPASS RESTRICTION ADJUSTING SCREW BYPASS RESTRICTION (KEY 11) EXHAUST SUPPLY PORT SUPPLY OUTPUT TO ACTUATOR W0679‐1 Diagnostic Connections To support diagnostic testing of valve/actuator/positioner packages, install connectors and hardware between the 2625 or 2625NS volume booster and the actuator.
PAGE 7
Instruction Manual 2625 and 2625NS Volume Booster D100348X012 January 2015 WARNING If a flammable or hazardous gas is to be used as the supply pressure medium, personal injury, property damage or equipment damage could result from fire or explosion of accumulated gas or from contact with hazardous gas. The volume booster has no provision for piping away the vented exhaust gas.
PAGE 8
2625 and 2625NS Volume Booster January 2015 Instruction Manual D100348X012 Maintenance WARNING Always wear protective clothing, gloves, and eyewear when performing any maintenance procedures to avoid personal injury. Maintenance requires taking the volume booster out of service periodically. To avoid personal injury or equipment damage, disconnect or bypass any pressure lines to the booster, and vent any pressure locked in the unit before you begin maintenance.
PAGE 9
Instruction Manual D100348X012 2625 and 2625NS Volume Booster January 2015 Valve Assembly Replacement CAUTION The distance between the exhaust port seat line on the upper valve (key 7C) and the supply port seat line on the lower valve and stem (key 7B) is critical to ensure the deadband requirements of the volume booster. This distance must be adjusted in accordance with the following steps before you replace the valve assembly (key 7), or the upper valve (key 7C), and lower valve and stem (key 7B).
PAGE 10
2625 and 2625NS Volume Booster January 2015 Instruction Manual D100348X012 6 . Install the diaphragm assembly (key 5) onto the upper valve (key 7C). 7 . Install the diaphragm spacer (key 2) onto the body (key 1). 8 . Place a straight edge at least 5 inches (127 mm) long across the diaphragm spacer (key 2). The upper surface of the diaphragm assembly (key 5) should coincide with the upper surface of the diaphragm spacer (key 2).
PAGE 11
Instruction Manual 2625 and 2625NS Volume Booster D100348X012 January 2015 Parts Ordering Whenever corresponding with your Emerson Process Management sales office about this equipment, mention the serial number of the volume booster. This serial number can be found on the nameplate (key 16, figure 4). WARNING Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Process Management should not, under any circumstances, be used in any Fisher instrument.
PAGE 12
Instruction Manual 2625 and 2625NS Volume Booster D100348X012 January 2015 Figure 5.