M20BP0 pages

Model 20BP Pneumatic Precision Back Pressure Booster

Features

• The Model 20BP Pneumatic High Capacity

Back Pressure Booster uses a pneumatic

input signal to accurately control output

pressure

■ Aspirator Tube compensates pressure

droop under flowing conditions

■ A separate Control Chamber isolates the

diaphragm from the main flow to eliminate

hunting and buzzing

* Unit construction allows servicing without

removal

• Mounting Bracket available

Operating Principles

The Model 20BP Back Pressure Booster

is a pneumatic device capable of high flow

capacity. This device uses a force bal-

ance system to open the relief valve and

vent system pressure when the set point is

exceeded.

When system pressure increase, the force

on the bottom of the Diaphragm Assembly

increase until it reaches the set point. When

system pressure increases beyond the set

point, the assembly moves upward, lifting

the Relief Valve from its seat and vents the

system air.

If system pressure decreases below the set

point, the assembly moves downward clos-

ing the Relief Valve.

OUTLET

PORT

1 7« n T

47.6 of in*

X

9(16

144*

55* '**'

3M

V

4t

2 1/4

76.2

B.S

1/8

28.6

T

1

M NPT ■

Signal P(*1 ^ +

t 51.164

04HFT

Ojitfti Ron

f M NPT

Model 20 Mounting Bracket Kit

P/N 09921 (Zinc Plated Steel)

(sold separately)

1* NPT

800-334-8422

www.fairchildproducts.com