Model 200XLR Pneumatic Volume Booster

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The Fairchild 200XLR Pneumatic Volume Booster produces a pneumatic signal in a 1:1 ratio. It is ideally suited for systems that require input isolation or increased forward and exhaust flow capacities.


  • Control sensitivity to 1" water column variation
  • Large supply and Exhaust Valves provide high forward and exhaust flows.
  • An Aspirator Tube minimizes downstream pressure droop under flow conditions.
  • A separate Control Chamber isolates the diaphragm from the main flow to eliminate hunting and buzzing
  • Optional Increased Sensitivity configuration with larger Control Diaphragm for more

Operating Principles

When signal pressure on the top of the signal Diaphragm creates a dow n ward 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 downward force of the signal pressure that acts on the top of the Signal Diaphragm balances with the upward force of the output pressure that acts on the bottom of the Control Diaphragm.

When the output pressure increases above the signal pressure, the Diaphragm Assembly moves upward to close the Supply Valve and open the Exhaust Valve. Excess output pressure exhausts through the Exhaust Port until it reaches the setpoint.


Flow Capacity (SCFM)
In excess of 1500 (2550 m³/hr) @ 100 psig, [7.0 BAR], (700 kPa) supply and 20 psig, [1.5 BAR], (1500 kPa) setpoint
Exhaust Capacity (SCFM)
325 (552.5 m³/hr) where downstream pressure is 5 psig, [.35 BAR], (35 kPa) above 20 psig, [1.5 BAR], (150 kPa) setpoint
Supply Pressure
250 psig, [17.0 BAR], (1700 kPa) Maximum
Supply Pressure Effect
Less than 0.5 psig, [.03 BAR], (3.4 kPa) for 100 psig, [7.0 BAR], (700 kPa) change in supply pressure
Signal or Output Pressure
150 psig, [10.0 BAR], (1000 kPa) Maximum
1" (2.54 cm) Water Column
Ambient Temperature
-40°F to +200°F, (-40°C to +93°C)
Materials of Construction
Body and Housing: Die Cast Aluminum
Trim: Stainless Steel, Brass, Aluminum, and Zinc Plated Steel
Diaphragms: Nitrile on Dacron

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

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