Automatic exhaust valve is usually installed in the automatic sprinkler wet, dry, and the role of foam spray system in the stem end top of the tube, pipe, fire hydrant system of each tube of force at the top. In the system without water filling, the exhaust valve is in open state, when the pressure of water into the pipe network, the air in the tube is compressed into the exhaust valve, exhaust pipe from the air outlet, prevent air blocking, air bag production, ensure the normal operation of the system. When the pressure of water full of the exhaust valve, the valve ball float upward movement, close the exhaust port, to prevent the overflow of water, when the system maintenance discharge pipe water, automatically open the exhaust port suction to prevent  network deformation and damage as to negative pressure.


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