On the working principle of gas path amplifiers
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As shown in the figure, what is the purpose of the small hole marked with a red circle in the amplifier? When the locator sends a signal, the valve stem of the amplifier moves downward, allowing the main air path to be open. When the locator does not send a signal, the valve stem is pushed back to its initial position by the spring, thereby closing the main air path. How does the amplifier manage to exhaust air?
The working principle of a pneumatic amplifier is to utilize a small pneumatic circuit connected to the main circuit; by controlling the opening and closing of valves in this small circuit, the pressure signal in the main circuit is amplified. The small hole in the red circle is there to allow the smaller air path to be connected to the atmosphere. Under the pressure of the main air path, the valve core moves downward, connecting the smaller air path to the atmosphere, thereby enabling the air path amplifier to amplify the pressure signal from the main air path ； When the locator does not send a signal, the spring force causes the valve stem to return to its initial position, preventing the small air passage from being in communication with the atmosphere, thereby enabling exhaust function. In simple terms, the function of the small hole is to connect or isolate the small air path from the main air path, thereby enabling control over the signals in the main air path. .
Doesn’t your amplifier have three interfaces?