奇灵公司旗下品牌三防阀具有防臭、防虫、防回流功能。当有水流抬升时勺型挡板将依靠浮力抬起，方便水流通过，水位下降时，阀门闭合，即使在水分枯竭时，勺型挡板也将有效防止污染空气逆流。 

Qiling's brand three proof valve has the functions of deodorization, insect prevention and backflow prevention. When the water flow rises, the scoop baffle will be lifted by buoyancy to facilitate the water flow. When the water level drops, the valve will be closed. Even when the water is exhausted, the scoop baffle will also effectively prevent the polluted air from countercurrent.