Model 20 Pneumatic Precision Booster

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The Fairchild 20 Pneumatic High Capacity Volume Booster uses a pneumatic input signal to accurately control output pressure. A balanced supply valve minimises the effects of supply pressure variation.


  • An Aspirator Tube compensates downstream pressure droop under flowing conditions.
  • Optional Adjustable By-Pass Needle Valve allows tuning for optimum dynamic response (1:1 ratio only).
  • Optional Fixed Negative Bias allows operation with pneumatic devices that cannot be adjusted to zero input pressure.
  • 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.
  • Canadian Registration Number (CRN) Certification for all territories and provinces.

Operating Principles

The Fairchild 20 Booster is a pneumatic device capable of high flow and exhaust capacity. This device uses a force balance system to control the movement of the supply and exhaust valves.

At set point, the force due to signal pressure that acts on the top of the Upper Diaphragm balances with the force due to output pressure acting on the bottom of the Lower Diaphragm.


See Catalogue Pages for full specification.

Catalogue PDF: application/pdf
Operational PDF: application/pdf
Located in: Volume Boosters

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