Emerson Fisher 2625 Instruction Manual

Volume booster
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Instruction Manual
D100348X012
Fisherr 2625 and 2625NS Volume Boosters
Contents
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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
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Figure 1. Fisher 2625 Volume Booster
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2625 and 2625NS Volume Booster
January 2015

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  Summary of Contents for Emerson Fisher 2625

  • Page 1: Table Of Contents

    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.
  • Page 2: Specifications

    Instruction Manual 2625 and 2625NS Volume Booster January 2015 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.
  • Page 3: Educational Services

    4. Zero psig to maximum supply. Educational Services For information on available courses for 2625 and 2625NS volume boosters, as well as a variety of other products, contact: Emerson Process Management Educational Services - Registration Phone: +1-641-754-3771 or +1-800-338-8158 e‐mail: education@emerson.com...
  • Page 4: Installation

    Instruction Manual 2625 and 2625NS Volume Booster January 2015 D100348X012 Table 2. Maximum Flow Coefficients PORT SIZE COMBINATIONS SUPPLY PORT COEFFICIENTS EXHAUST PORT COEFFICIENTS Supply Port Exhaust Port Inch Inch 0.094 3.74 0.23 0.375 0.375 3.74 2.29 12.7 3.74 3.40 0.094 4.98 0.24...
  • Page 5: Pressure Connections

    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).
  • Page 6: Diagnostic Connections

    Instruction Manual 2625 and 2625NS Volume Booster January 2015 D100348X012 Figure 3. Volume Booster Sectional View INPUT SIGNAL BYPASS RESTRICTION ADJUSTING SCREW DIAPHRAGMS (KEY 5 AND 6) BYPASS RESTRICTION EXHAUST PORT (KEY 11) EXHAUST SUPPLY PORT OUTPUT TO ACTUATOR SUPPLY W0679‐1 Diagnostic Connections To support diagnostic testing of valve/actuator/positioner packages, install connectors and hardware between the...
  • Page 7: Exhaust Ports

    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: Maintenance

    Instruction Manual 2625 and 2625NS Volume Booster January 2015 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: Valve Assembly Replacement

    Instruction Manual 2625 and 2625NS Volume Booster D100348X012 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: Installation Of Diagnostic Connections

    Instruction Manual 2625 and 2625NS Volume Booster January 2015 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: Parts Ordering

    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. The use of components not manufactured by Emerson Process Management may void your warranty, might adversely affect the performance of the instrument, and could cause personal injury and property damage.
  • Page 12 Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user. Fisher, FIELDVUE, and FlowScanner are marks owned by one of the companies in the Emerson Process Management business unit of Emerson Electric Co.

This manual is also suitable for:

Fisher 2625ns