奇靈公司旗下品牌三防閥具有防臭、防蟲、防回流功能。當有水流抬升時勺型擋板將依靠浮力抬起，方便水流通過，水位下降時，閥門閉合，即使在水分枯竭時，勺型擋板也將有效防止污染空氣逆流。 

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.