Fairchild Model 20 - Volume Booster

The Fairchild Model 20 Pneumatic High Capacity Volume 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 a 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. The volume booster uses a pneumatic input signal to accurately control output pressure, for systems requiring the conversion of a low flow control signal to the higher requirements of an operating system. Ten signal to output ratios.

Some of the features and benefits include:

• Maximum Output Pressure 150 PSIG
• Maximum Supply Pressure 250 PSIG
• Flow Capacity SCFM @ 100 PSIG supply 45, 20 PSIG output
• Sensitivity 1/4" Water Column
• Pipe size 1/4 NPT - 3/8 NPT/BSPT
• A balanced Supply Valve minimises the effects of supply pressure variation
• An Aspirator Tube compensates downstream pressure droop under flow in 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