• A quick exhaust valve is a typical shuttle valve.
• It consist of a movable disc (also called flexible ring) and three ports namely, Supply port 1, which is connected to the output of the final control element (Directional control valve).
• The Output port, 2 of this valve is directly fitted on to the working port of cylinder.
• The exhaust port, 3 is left open to the atmosphere

Forward Motion: During forward movement of piston, compressed air is directly admitted behind the piston through ports 1 and 2, Port 3 is closed due to the supply pressure acting on the diaphragm. Port 3 is usually provided with a silencer to minimise the noise due to exhaust.

Return Motion: During return movement of piston, exhaust air from cylinder is directly exhausted to atmosphere through opening 3 (usually larger and fitted with silencer). Port 2 is sealed by the diaphragm. Thus exhaust air is not required to pass through long and narrow passages in the working line and final control valve.

Application of a quick exhaust valve :

They are available in a variety of shapes and sizes and are used in the industry to speed up the performance of a moving cylinder, evacuate air directly out into the atmosphere and increase the cylinder rod reaction time, or valve actuator.

High quality quick exhaust valves are the key to efficient functions in the industrial segments.