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Pressure Regulating (Anti-G) Valves
Anti-g System Maintenance

Aviation Structural Mechanic E2 - How airplanes are built and how to maintain them
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and maintains a maximum of 9 to 11 psi in the valve outlet chamber. Figure 1-4 illustrates the operation of the single-stage anti-g valve. When a force of approximately 1.5 g’s is exerted on the aircraft, the activating weight over- comes the upper spring tension and closes the exhaust valve (fig. 1-4, view A). As the weight travels downward, it further depresses the valve assembly, forcing the demand valve from its seat, thus overriding the pressure of the lower spring and opening the demand valve. Air pressure then flows past the open demand valve, through the valve outlet into the valve outlet line, through the suit quick disconnect, and into the anti-g suit. As the g forces being applied to the aircraft are stabilized and become constant, the pressure under the activating weight diaphragm builds up sufficiently to lift the weight and to reduce the pressure on the valve assembly enough to close the demand valve (fig. 1-4, view B). The demand valve closes under pressure of the heavier lower spring, while the exhaust valve remains closed by the activating weight. The suit pressure is then trapped in the pressure outlet chamber of the Figure 1-4.—Anti-g valve operation (single stage). 1-4







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