Emerson Fisher Vbl Volume Booster Data Sheet

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Product Bulletin

VBL Volume Booster

62.3:VBL
February 2014

D103393X012

Fisherr VBL Volume Booster
The Fisher VBL volume booster is used in conjunction
with a positioner on a throttling control valve to
increase stroking speed.
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).
X0648

Connectors and piping can be installed with the VBL
volume booster for diagnostic testing.
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

Features
n Fast Response—Booster delivers the volume needed

for rapid actuator stroking when large input
changes suddenly occur.

www.Fisher.com

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.

Product Bulletin

VBL Volume Booster

62.3:VBL
February 2014

D103393X012

Specifications
Input Signal

Maximum Flow Coefficients
See table 1

Positioner output
Maximum Input Signal Pressure(1)
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
Fixed at 1 to 1

Connections
Input Signal: 1/4 NPT
Supply and Output: 1/2 NPT
Hazardous Area Classification
Complies with the requirements of ATEX Group II
Category 2 Gas and Dust

Supply Pressure Ranges(1)
When used in conjunction with a positioner or other
pneumatic accessory, always pipe the positioner and
booster with one common supply through a Fisher
67D, 67DR, or 95H regulator (see figure 2). A
high-capacity filter, such as the Fisher 262K, should
be installed in the supply line to the regulator. Supply
pressure also must not exceed the maximum
pressure rating of the actuator.
Operative Temperature Limits(1)
-40 to 93_C (-40 to 200_F)

Construction Materials
Body: Aluminum
Diaphragms: HNBR with nylon fabric
Upper and Lower Valves: HNBR
O-Rings: HNBR
Connectors for Diagnostic Testing: JStainless steel
or Jbrass
Approximate Weight
1.0 kg (2.2 lb)

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 should not be exceeded.

Table 1. Maximum Flow Coefficients
Instrument

Supply Port Coefficients

Exhaust Port Coefficients

Cv

Cv

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

0.37

0.31

FIELDVUE DVC2000 digital valve controller:
Low pressure relay
High pressure relay

0.13
0.19

0.15
0.20

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

2

Product Bulletin

VBL Volume Booster

62.3:VBL
February 2014

D103393X012

Principle of Operation
Refer to figures 1, 2, and 3. 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. When this occurs, the
diaphragms move to open either the supply port or the
exhaust port, whichever action is required to reduce

the pressure differential. The port remains open until
the difference between the booster input and output
pressures returns to within the deadband limits of the
booster. With the bypass restriction adjusted for stable
operation, signals having small magnitude and rate
changes pass through the bypass restriction and into
the actuator without initiating booster operation.
Both the supply and exhaust ports remain closed,
preventing unnecessary air consumption and possible
saturation of positioner relays.

Figure 1. Volume Booster Sectional View

SPRING SEAT

UPPER SPRING

HOUSING, TOP
EXHAUST PORT

HEX NUT
INPUT
SIGNAL

HEX SCREW
UPPER DIAPHRAGM

BYPASS RESTRICTION
ADJUSTING SCREW

DIAPHRAGM SPACER

PIN, SLOTTED
SPRING
BYPASS VALVE

O‐RING
HOUSING, BOTTOM
SUPPLY
O‐RING

DIAPHRAGM PLATE
ASSEMBLY (INCLUDES
LOWER DIAPHRAGM)

EXHAUST
SUPPLY PORT
OUTPUT TO
ACTUATOR
LOWER SPRING
VALVE PLUG ASSEMBLY

END CAP
LUBRICANT
GE26237-Section

3

Product Bulletin

VBL Volume Booster

62.3:VBL
February 2014

D103393X012

Figure 2. Typical Installation with Piston Actuator

PIPE NIPPLE

VBL
VOLUME BOOSTER

SUPPLY

SIGNAL
TOP CYL

BOTTOM CYL

ACTUATOR

67D, 67DR, OR 95H
REGULATOR

E1212

POSITIONER

Figure 3. Typical Installation with Diaphragm Actuator

VBL VOLUME BOOSTER

PIPE
NIPPLE
SUPPLY

SIGNAL

67D, 67DR, OR 95H
REGULATOR

ACTUATOR

4

E1213

DVC6200 DIGITAL VALVE CONTROLLER
WITH RELAY C OR POSITIONER

Product Bulletin

VBL Volume Booster

62.3:VBL
February 2014

D103393X012

Installation
Figures 2 and 3 show typical installations for the VBL
volume booster on piston and diaphragm actuators. A
single regulator that supplies both the positioner and
booster (or boosters) is recommended. The supply
medium must be clean, dry, oil-free air or
non-corrosive gas.

Keep in mind that many actuators require larger casing
or cylinder connections to take full advantage of the
booster's ability to deliver its high-volume output.
Dimensions are shown in figure 4. Ensure that the
supply pressure is connected to correspond with the
flow arrow on the booster.
Verify that the capacity of the regulator meets the
stroking capacity requirements.

Figure 4. Dimensions
20
(0.79)
1/4-18 NPT
INPUT CONN

EXHAUST HOLES
17X ∅ 6 (0.24)
93.9
(3.70)

29.8
(1.17)
1/2-14 NPT
OUTPUT
TO ACTUATOR

1/2-14 NPT
SUPPLY
CONN

GE26237-Outlook

52
(2.05)
104
(4.09)

mm
(INCH)

5

Product Bulletin
62.3:VBL
February 2014

Ordering Information
Specify stroking speed information when being
mounted at the factory, for proper tuning of the
instruments. Specify either critical or non-critical
stroke speed time.

Note
Critical stroke speed time example: valve to stroke in both
directions in 4 seconds or less.
Non-critical stroke speed time example: valve to stroke in
approximately 4 seconds in both directions.

6

VBL Volume Booster
D103393X012

VBL Volume Booster
D103393X012

Product Bulletin
62.3:VBL
February 2014

7

Product Bulletin
62.3:VBL
February 2014

VBL Volume Booster
D103393X012

Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance
of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Fisher and FIELDVUE are marks owned by one of the companies in the Emerson Process Management business unit of Emerson Electric Co. Emerson Process
Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective
owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not
to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such
products at any time without notice.
Emerson Process Management
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Chatham, Kent ME4 4QZ UK
Dubai, United Arab Emirates
Singapore 128461 Singapore

www.Fisher.com
E
8 2010, 2014 Fisher Controls International LLC. All rights reserved.



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