Emerson Fisher Vbl Volume Booster Data Sheet

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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).

Connectors and piping can be installed with the VBL

volume booster for diagnostic testing.

Features

n Fast Response—Booster delivers the volume needed

for rapid actuator stroking when large input

changes suddenly occur.

X0648

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.

VBL Volume Booster

D103393X012

Product Bulletin

62.3:VBL

February 2014

VBL Volume Booster

D103393X012

Product Bulletin

62.3:VBL

February 2014

2

Specifications

Input Signal

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

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)

Maximum Flow Coefficients

See table 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

Construction Materials

Body: Aluminum

Diaphragms: HNBR with nylon fabric

Upper and Lower Valves: HNBR

O-Rings: HNBR

Connectors for Diagnostic Testing: JStainless steel

or Jbrass

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

CvCv

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

VBL Volume Booster

D103393X012

Product Bulletin

62.3:VBL

February 2014

3

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

GE26237-Section

UPPER DIAPHRAGM

DIAPHRAGM PLATE

ASSEMBLY (INCLUDES

LOWER DIAPHRAGM)

DIAPHRAGM SPACER

LOWER SPRING

VALVE PLUG ASSEMBLY

LUBRICANT

HOUSING, TOP

HEX SCREW

EXHAUST PORT

EXHAUST

OUTPUT TO

ACTUATOR

SUPPLY PORT

END CAP

SPRING SEAT UPPER SPRING

BYPASS RESTRICTION

ADJUSTING SCREW

SUPPLY

HEX NUT

PIN, SLOTTED

SPRING

BYPASS VALVE

O‐RING

HOUSING, BOTTOM

O‐RING

INPUT

SIGNAL

VBL Volume Booster

D103393X012

Product Bulletin

62.3:VBL

February 2014

4

Figure 2. Typical Installation with Piston Actuator

ACTUATOR

VBL

VOLUME BOOSTER

PIPE NIPPLE

POSITIONER

SUPPLY

BOTTOM CYL

TOP CYL

67D, 67DR, OR 95H

REGULATOR

SIGNAL

E1212

Figure 3. Typical Installation with Diaphragm Actuator

DVC6200 DIGITAL VALVE CONTROLLER

WITH RELAY C OR POSITIONER

SUPPLY

VBL VOLUME BOOSTER

PIPE

NIPPLE

ACTUATOR

SIGNAL

E1213

67D, 67DR, OR 95H

REGULATOR

VBL Volume Booster

D103393X012

Product Bulletin

62.3:VBL

February 2014

5

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

1/2-14 NPT

SUPPLY

CONN

EXHAUST HOLES

17X ∅

1/4-18 NPT

INPUT CONN

20

(0.79)

93.9

(3.70)

6 (0.24)

1/2-14 NPT

OUTPUT

TO ACTUATOR

104

(4.09)

52

(2.05)

mm

(INCH)

29.8

(1.17)

GE26237-Outlook

VBL Volume Booster

D103393X012

Product Bulletin

62.3:VBL

February 2014

6

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.

VBL Volume Booster

D103393X012

Product Bulletin

62.3:VBL

February 2014

7

VBL Volume Booster

D103393X012

Product Bulletin

62.3:VBL

February 2014

8

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

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