Model 2000 Pneumatic Volume Booster

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The Fairchild 2000 Pneumatic Volume Booster converts a low flow signal to a high flow output. It is ideally suited for a variety of applications including the operation of air systems that require rapid valve or cylinder action.


  • A balanced Supply Valve minimizes the effect of supply pressure variation.
  • An Aspirator Tube minimizes downstream pressure droop under flow conditions.
  • Large Supply and Exhaust Valves provide high forward and exhaust flows.
  • Soft Supply and Exhaust Valve Seats minimize air consumption.
  • Small signal volume assures rapid response to pressure variation.
  • A separate Control Chamber isolates the Diaphragm from the main flow to eliminate hunting and buzzing.
  • Unit construction lets you service the unit without removing it from the line.

Operating Principles

When signal pressure on the top of the Signal Diaphragm creates a downward force on the Diaphragm Assembly, the Supply Valve opens.

Output pressure flows through the Outlet Port and the Aspirator Tube to the Control Chamber to create an upward force on the bottom of the Control Diaphragm. When the setpoint is reached, the force of the signal pressure that acts on the top of the Signal Diaphragm balances with the force of the output pressure that acts on the bottom of the Control Diaphragm to close the Supply Valve.

When the output pressure increases above the signal pressure, the Diaphragm Assembly moves upward to close the Supply Valve and open the Exhaust Valve. Because the Poppet Valve is closed, pressure flows down the Connecting Tube to the bottom of the Motor Diaphragm. This pressure keeps the Supply Valve tightly closed while in the exhaust mode. The Poppet Valve opens and excess output pressure exhausts through the vent in the side of the unit until it reaches the setpoint.


Maximum Supply Pressure
250 psig, [17.0 BAR], (1700 kPa)
Flow Capacity (SCFM)
40 (68 m³/HR) @ 100 psig, [7.0 BAR], (700 kPa) supply & 20 psig, [1.5 BAR], (150 kPa) setpoint
Exhaust Capacity (SCFM)
16 (27.2 m³/HR) where downstream pressure is 5 psig, [.35 BAR], (35 kPa) above 20 psig, 1.5 BAR], (150 kPa) setpoint
Maximum Signal or Output Pressure
150 psig, [10.0 BAR], (1000 kPa)
Supply Pressure Effect
Less than 0.1 psig, [.007 BAR], (.7 kPa) for 100 psig, [7.0 BAR], (700 kPa) change in supply pressure
Less than 1” (2.54 cm) Water Column
Ambient Temperature
-40°F to +200°F, (-40°C to +93°C)
Materials of Construction
Body and Housing: Zinc
Diaphragms: Nitrile on Dacron

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

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