Model20BP0 pages

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Model 20BP Pneumatic Precision Back Pressure Booster

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Features

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• The Model 20BP Pneumatic High Capacity

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Back Pressure Booster uses a pneumatic

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input signal to accurately control output

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pressure

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■ Aspirator Tube compensates pressure

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droop under flowing conditions

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■ A separate Control Chamber isolates the

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diaphragm from the main flow to eliminate

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hunting and buzzing

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* Unit construction allows servicing without

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removal

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• Mounting Bracket available

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Operating Principles

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The Model 20BP Back Pressure Booster

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is a pneumatic device capable of high flow

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capacity. This device uses a force bal-

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ance system to open the relief valve and

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vent system pressure when the set point is

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exceeded.

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When system pressure increase, the force

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on the bottom of the Diaphragm Assembly

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increase until it reaches the set point. When

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system pressure increases beyond the set

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point, the assembly moves upward, lifting

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the Relief Valve from its seat and vents the

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system air.

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If system pressure decreases below the set

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point, the assembly moves downward clos-

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ing the Relief Valve.

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OUTLET

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PORT

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47.6 of in*

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X

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9(16

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144*

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55* '**'

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3M

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V

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4t

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2 1/4

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76.2

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B.S

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1/8

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28.6

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T

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1

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M NPT ■

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Signal P(*1 ^ +

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t 51.164

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04HFT

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Ojitfti Ron

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Model 20 Mounting Bracket Kit

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P/N 09921 (Zinc Plated Steel)

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(sold separately)

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1* NPT

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800-334-8422

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www.fairchildproducts.com

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