Instruction Manual
D103317X012
Fisher™ VBL Volume Booster
VBL Volume Booster
December 2021
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 1.................................
Specifications 2...............................
Educational Services 2.........................
Installation 4..................................
Mounting 4..................................
Pressure Connections 5........................
Supply Pressure 5.............................
Exhaust Ports 5...............................
Operating Information 6.........................
Principle of Operation 7.........................
Maintenance 8.................................
Introduction
Figure 1. Fisher VBL Volume Booster
X0648
Scope of Manual
This instruction manual provides installation, operation, maintenance, and parts information for the Fisher VBL
volume booster (figure 1). Refer to separate instruction manuals for information regarding the valve body, actuator,
and other accessories.
Do not install, operate, or maintain a VBL 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 about these instructions,
contact your Emerson sales office
before proceeding.
Description
The VBL volume booster is 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 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. This adjustment
does not affect the deadband of the booster, but does permit the control valve to respond to small input signal
changes from the positioner without sacrificing steady‐state accuracy.
www.Fisher.com
VBL Volume Booster
December 2021
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 you use the volume booster only with an actuator, for on‐off control, the integral bypass restriction
on the volume booster must be closed (turned fully clockwise).
To facilitate diagnostic testing, you can install connectors and piping with the VBL volume booster.
The O‐rings and diaphragms in the VBL volume booster are HNBR (Hydrogenated Nitrile). HNBR demonstrates
excellent temperature capability and shelf life over standard nitrile.
Instruction Manual
D103317X012
Specifications
Specifications for the VBL volume booster are listed in table 1. Information for an individual unit as it comes from the
factory appears on the nameplate.
Educational Services
For information on available courses for the VBL volume booster, as well as a variety of other products, contact:
Emerson Automation Solutions
Educational Services - Registration
Phone: 1-641-754-3771 or 1-800-338-8158
E-mail: education@emerson.com
emerson.com/fishervalvetraining
2
Instruction Manual
D103317X012
Table 1. Specifications
VBL Volume Booster
December 2021
Input Signal
Positioner output
Hazardous Area Classification
Complies with the requirements of ATEX Group II
Category 2 Gas and Dust
Maximum Input Signal Pressure
VBL-1 and VBL-3: 5.5 bar (80 psig)
VBL-2 and VBL-4: 10.3 bar (150 psig)
Input to Output Pressure Ratio
(1)
Maximum surface temperature (Tx) depends on
operating conditions
Gas: T5, T6
Dust: T85…T93
Fixed at 1 to 1
Meets Customs Union technical regulation TP TC
Supply Pressure Ranges
(1)
When used in conjunction with a positioner or other
pneumatic accessory, always pipe the positioner and
012/2011 for Groups II/III Category 2 equipment
II Gb c T*X X
III Db c T*X X
booster with one common supply through a Fisher
67D, 67DR, or 95H regulator (see figure 4). A
high‐capacity filter, such as the Fisher 262K, should
be installed in the supply line to the regulator. Supply
Safety Instrumented System Classification
SIL3 capable - certified by exida Consulting LLC
pressure also must not exceed the maximum
pressure rating of the actuator.
Approximate Weight
Aluminum Body: 1.0 kg (2.2 pounds)
Operative Temperature Limits
-40 to 93_C (-40 to 200_F)
(1)
Declaration of SEP
Fisher Controls International LLC declares this
product to be in compliance with Article 4 paragraph
Maximum Flow Coefficients
See table 2
3 of the PED Directive 2014/68/EU. It was designed
and manufactured in accordance with Sound
Engineering Practice (SEP) and cannot bear the CE
marking related to PED compliance.
Connections
Input Signal: 1/4 NPT
Supply and Output Signal: 1/2 NPT
NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1 - Process Instrument Terminology.
1. The pressure/temperature limits in this document, and any applicable code or standard limitation should not be exceeded.
However, the product may bear the CE marking to
indicate compliance with other applicable European
Community Directives.
Ex h IIC Tx Gb
Ex h IIIC Tx Db
Table 2. Maximum Flow Coefficients
Instrument
VBL‐1 volume booster 2.5 1.1
VBL-2 volume booster 2.5 1.1
VBL‐3 volume booster 2.5 1.8
VBL-4 volume booster 2.5 1.8
FIELDVUEt DVC6200, DVC6200 SIS, DVC6200f, DVC6200p,
DVC6000, DVC6000 SIS, DVC6000f digital valve controllers
FIELDVUE DVC2000 digital valve controller
Low pressure relay
High pressure relay
Fisher 3570 valve positioner 0.25 0.25
Fisher 3582 valve positioner 0.17 0.19
Fisher 3610J, 3610JP, 3611JP, 3620J, 3620JP, 3621JP valve positioners 0.37 0.30
Supply Port Coefficients Exhaust Port Coefficients
C
v
0.37 0.31
0.13
0.19
C
0.15
0.20
v
3
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