PPA 自动排气阀用于自动喷水灭火系统、给排水系统及输水系统等流体为水的系统中，排出水中的空气。

自动排气阀有普通，电控两种形式。

自动排气阀主要用于湿式系统及给排水系统中．可以把管网加压过程中，水流动时由于改变压力，流速而从水中析出的空气排尽．从而减少管网中水锤现象。提高系统工作效率。

PPAD 电控自动排气阀通过电磁阀来控制，电磁阀打开时排气，关闭时，系统内可以充气，主要用于干式系统和预作用系统，电磁阀由总控室控制，有火情时．通过驱动模块打开电磁阀，加速系统排气，缩短了管网充水时间，提高灭火效率。

PPA automatic exhaust valve use for automatic sprinkler systems, water supply and drainage systems and water conveyance systems, and such water fluid systems, exhaust air from water.

Auto exhaust valve have two forms of common and electronic control.

Automatic exhaust valve is mainly used for wet systems and drainage systems. It could exhaust air which separates out from water during the forcing procedure on tube network, caused by the pressure and speed changes by water flow. Thereby reduce the water hammer appearance in the pipe network. Improve the system efficiency.

PPAD electronically controlled automatic exhaust valve is controlled by a solenoid valve, when the solenoid valve opens, the air exhaust, when closed, can be inflated within the system, mainly used for dry systems and pre-action system, the solenoid valve control by the master control room, when a fire, open the solenoid valve through drive module, speed up the exhaust and shorten the time of filling water 
of pipe network, improve firefighting efficiency.