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Instruction Manual
D103317X012
Fisher
VBL Volume Booster
™
Contents
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Introduction
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
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
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Figure 1. Fisher VBL Volume Booster
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1
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X0648
Emerson sales office
VBL Volume Booster
or Local Business Partner before
May 2017
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Table of Contents
Related Manuals for Emerson fisher VBL
Summary of Contents for Emerson fisher VBL
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Page 1: Table Of Contents
X0648 Introduction 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. -
Page 2: 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... - Page 3 Instruction Manual VBL Volume Booster D103317X012 May 2017 Table 1. Specifications Input Signal Connections Positioner output Input Signal: 1/4 NPT Supply and Output Signal: 1/2 NPT Maximum Input Signal Pressure VBL-1 and VBL-3: 5.5 bar (80 psig) Hazardous Area Classification VBL-2 and VBL-4: 10.3 bar (150 psig) Complies with the requirements of ATEX Group II Category 2 Gas and Dust...
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Page 4: Installation
Instruction Manual VBL Volume Booster May 2017 D103317X012 Installation WARNING Always wear protective clothing, gloves, and eyewear when performing any installation procedures to avoid personal injury. System damage may result if a volume booster is installed in a way that it can be physically damaged. Personal injury or system damage may result when service conditions exceed booster or other equipment ratings. -
Page 5: Pressure Connections
Instruction Manual VBL Volume Booster D103317X012 May 2017 Figure 2. Volume Booster with Yoke Mounting Bracket HEX SCREW (QTY 6) HEX SCREW (QTY 6) ATTACH THIS SURFACE TO ACTUATOR YOKE YOKE MOUNTING BRACKET YOKE MOUNTING BRACKET GE26237-Bracket Pressure Connections CAUTION Do not use sealing tape on pneumatic connections. -
Page 6: Operating Information
Instruction Manual VBL Volume Booster May 2017 D103317X012 Operating Information The only operating requirement of the volume booster is the adjustment of the bypass restriction for stable actuator performance. Although systems with different characteristics may require different adjusting techniques, the following adjustment procedure is recommended when using the actuator for throttling control. -
Page 7: Principle Of Operation
Instruction Manual VBL Volume Booster D103317X012 May 2017 Principle of Operation Refer to figures 3, 4, and 5. Because of the restriction, large input signal changes register on the booster input diaphragm sooner than in the actuator. A large, sudden change in the input signal causes a pressure differential to exist between the input signal and the output of the booster. -
Page 8: Maintenance
Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user. Fisher is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co.