Fairchild Model 20 Pneumatic Volume Booster


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  • Flow capacity of 45 SCFM (76.5 m3/HR)
  • Ten available pressure ratios
  • Optional Adjustable By-Pass Needle Valve option includes bubble tight exhaust valve.
  • Optional Fixed Negative Bias.
  • A separate Control Chamber isolates the diaphragm from the main flow.
  • Unit construction.
  • Mounting Bracket available
  • Canadian Registration Number (CRN) Certification.


  • Fast responsive operation.
  • Easily suits your downstream pressure requirements.
  • Allows tuning for optimum dynamic response (1:1 ratio only) and cycle free operation with Valve Positioners.
  • Facilitates use with pneumatic signal devices that cannot be adjusted to zero signal pressure
  • Eliminates hunting and buzzing
  • Allows servicing without removal
  • Easy installation in the field
  • Suitable for use in all Canadian territories and provinces


The Fairchild Model 20 Volume Booster is a smaller pneumatic device capable of high flow and exhaust capacity. This volume booster uses a force balance system to control the movement of the supply and exhaust valves. As a pilot operated regulator design, the Fairchild Model 20 handles up to 150 psig, [10.0 BAR], (1000 kPa) supply pressure and has ten available ratios to cover a wide range of applications. The Fairchild Model 20 volume booster provides a flow capacity of 45 SCFM (76.5 m3/HR), which equates to a Cv factor of approximately 1.0 in both forward and exhaust modes. 20812, 20822, 20832, 20842, 20852, 20862, 20813, 20823, 20833, 20843, 20853, 20863

Additional information

1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 2:1, 3:1, 4:1, 5:1


1/4" NPT, 3/8" NPT