Model 4000A Pneumatic Pressure Regulator

Part Number: FA00652A, FA00670A
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The Fairchild 4000A Pneumatic Precision Regulator is a no bleed design regulator that precisely controls a set pressure. With a control sensitivity of 1/2" water column, it allows use in precision applications.


  • Control sensitivity of 1/2" water column allows use in precision applications.
  • Large Supply and Exhaust Valves provide high forward and exhaust flows.
  • Soft Supply and Exhaust Valve seats minimize air consumption.
  • A balanced Supply Valve minimizes the effect of supply pressure variation.
  • An Aspirator Tube compensates downstream pressure droop under flow conditions.
  • A separate Control Chamber isolates the diaphragm from the main flow to eliminate hunting and buzzing.
  • Unit construction lets you service the Fairchild 4000A without removing it from the line.
  • Canadian Registration Number (CRN) certification for all territories and provinces.

Operating Principles

When you adjust the Range Screw to a specific setpoint, the Range Spring exerts a downward force against the top of the Control Diaphragm. This downward force opens the Supply Valve. Output pressure flows through the Outlet Port and the Aspirator Tube to the Control Chamber where it creates an upward force on the bottom of the Control Diaphragm.

When the setpoint is reached, the force of the Range Spring that acts on the top of the Control Diaphragm balances with the force of output pressure that acts on the bottom of the Control Diaphragm and closes the Supply Valve.

When the output pressure increases above the setpoint, 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 output pressure exhausts through the Vent on the side of the unit until it reaches the setpoint.

Part Numbers

FAIRCHILD REGULATOR 4024A, 1/2 0.5-10psi
Pressure range 0.5-10psi, Ported 1/2" NPT , Nitrile Diaphragm, Alluminium Body, Sensitivity 1/2" WC, BSPT ‍

FAIRCHILD REGULATOR 4066A, 1/2 2-150psi
Pressure range 2-150psi, Ported 3/4" NPT , Nitrile Diaphragm, Aluminium Body, Sensitivity 1/2" WC ‍

Catalogue PDF: application/pdf
Operational PDF: application/pdf
Located in: Regulators

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