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Compressed Air Encyclopedia

Quick Exhaust Valves
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Quick exhaust valves are used to increase the actuation speed of cylinders by directly venting the exhaust air at the cylinder port instead of forcing the exhaust through tubing to the valve and through it’s exhaust port.

Quick exhaust valves are used to increase the actuation speed of cylinders by directly venting the exhaust air at the cylinder port instead of forcing the exhaust through tubing to the valve and through it’s exhaust port.

Often the limiting factor in valve size is not getting compressed air into a cylinder, but exhausting the air from the opposite end of it.

By using a quick exhaust valve, it may be possible to decrease the size of the valve.

Quick exhaust valves have three ports. A cylinder port, a valve port and an exhaust port. The cylinder port connects to directly to the cylinder, usually by a close nipple. The valve port connects through tubing to the valve’s cylinder port and the third port is the exhaust which often has a muffler installed in it.

A rubber diaphragm within the valve decides the route that the compressed air can take depending on which direction the air enters the valve.

If compressed air enters through the valve port, the diaphragm shifts to cover the exhaust port and allow the air to flow through to the cylinder port.

If exhaust air enters through the cylinder port, the pressure differential will cause the rubber diaphragm to shift the opposite way, covering the valve port and allowing passage of the exhaust air from the cylinder port to the exhaust port.

Quick exhaust valves are particularly suitable for applications where there are long lines

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