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Fisherr 2625 and 2625NS Volume Boosters

A Fisher 2625 or 2625NS volume booster is used in

conjunction with a positioner on a throttling control

valve to increase stroking speed. The 2625NS is a

nuclear‐service version and uses elastomeric

components that better withstand high temperature

and radiation environments.

The booster incorporates fixed deadband, 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. This adjustment does

not affect the deadband of the volume booster, but

does permit the control valve to respond to small input

signal changes without sacrificing steady‐state

accuracy. It also allows the booster to deliver

high‐volume output for fast stroking when large, rapid

input signal changes occur.

The volume booster is used to improve stroking speed.

If precision valve control is required, the use of a

positioner is recommended. If the volume booster is to

be used only with an actuator, for on‐off control, the

integral bypass restriction on the booster must be

closed (turned fully clockwise).

Connectors and piping can be installed with either

2625 or 2625NS volume booster for diagnostic

testing.

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.

W4727-1

Features

n Fast Response—Booster delivers the volume needed

for rapid actuator stroking when large input

changes suddenly occur.

n Adjustable Response—Integral bypass restriction

tunes the booster response so that smooth actuator

motion follows the slow signal changes.

n Efficient Operation—Soft seats provide tight shutoff

to reduce unnecessary air consumption and

eliminate saturation of positioner relays.

n Maintains Accuracy—Booster permits high actuator

stroking speeds upon demand without degrading

the positioner steady‐state accuracy.

n SIL 3 Capable - Certified for use in Safety

Instrumented System (SIS) applications.

2625 Volume Booster

D200071X012

Product Bulletin

62.3:2625

January 2015

1 2 3 4 5 6 7 8

Resumo do Conteúdo

Página 1 - Features

www.Fisher.comFisherr 2625 and 2625NS Volume BoostersA Fisher 2625 or 2625NS volume booster is used inconjunction with a positioner on a throttling co

Página 2 - Specifications

2625 Volume BoosterD200071X012Product Bulletin62.3:2625January 2015 2SpecificationsSupply Pressure RangesWhen used in conjunction with a positioner or

Página 3 - Principle of Operation

2625 Volume BoosterD200071X012Product Bulletin62.3:2625January 2015 3Figure 1. Sectional View of Fisher 2625 Volume BoosterINPUT SIGNALBYPASS RESTRICT

Página 4

2625 Volume BoosterD200071X012Product Bulletin62.3:2625January 2015 4Figure 2. Typical Installations2625VOLUMEBOOSTERPOSITIONEROUTPUTSIGNALPOSITIONERA

Página 5 - Service Applications

2625 Volume BoosterD200071X012Product Bulletin62.3:2625January 2015 5Figure 3. DimensionsA0807‐33/4‐14 NPTSUPPLY CONN9 EXHAUSTHOLES 7 (0.28) DIA1/4‐18

Página 6 - Ordering Information

2625 Volume BoosterD200071X012Product Bulletin62.3:2625January 2015 6InstallationFigure 2 shows typical installations for the 2625 or2625NS volume boo

Página 7

2625 Volume BoosterD200071X012Product Bulletin62.3:2625January 2015 7

Página 8

2625 Volume BoosterD200071X012Product Bulletin62.3:2625January 2015 8Emerson Process Management Marshalltown, Iowa 50158 USASorocaba, 18087 BrazilChat

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Emerson 2625NS Ficha Técnica

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