The water proof hammer valve is suitable for the pipeline with water as medium, as the equipment for inhaling and discharging the gas in the pipeline, so as to improve the efficiency of the water conveying equipment and protect the pipeline from deformation and rupture, it is the necessary equipment for the pipeline. Eliminate disconnection to bridge water hammer vacuum failure and trace exhaust composite valve: when the water column separation, can be high speed suction, destroy the vacuum; When the broken flow bridge is not high speed exhaust, the air bag plays a buffering role, but can exhaust trace, gradually eliminate the accumulated air.

The water proof hammer type air valve has the function of low pressure intake and exhaust as well as high pressure micro exhaust. The low-pressure intake and exhaust section works when the pipe pressure is low (empty pipe is filled with water, pipe is emptied, etc.), mainly for large quantities of exhaust and intake under low-pressure conditions; High pressure trace exhaust is mainly used to discharge the continuously precipitated gas in the pipeline in time when the pipeline is working under normal pressure, so as to reduce various adverse consequences that may be caused by it.

It has the function of waterproof hammer, that is: to ensure that the pipeline under the negative pressure condition when the water column is broken, exhaust quickly and in large quantities, so as to avoid the negative pressure production; When the subsequent water column bridging the working condition occurs, the valve effectively restricts the exhaust and, by delaying the exhaust time, creates an air sac like elastic compression space in the pipeline to prevent the pressure rise that may be caused by the rapid water column bridging, namely, the water hammer. The air valve has two cylindrical pontoons: a large pontoon and a small pontoon, respectively responsible for low pressure intake and exhaust and high pressure trace exhaust. The small pontoon is mounted above the large pontoon, and both pontoons are in the main body of the air valve with buffer plates to ensure smooth exhaust and prevent "gas plug" damage. The area that the buffer passes through and the number of holes can be adjusted when experiencing high speed exhaust.