air admittance valve meaning in Chinese

进气阀

Air admittance valves for plumbing drainage systems
污水管道系统用气体导入阀
Air admittance valves for building drainage systems
建筑排水系统吸气阀
Air admittance valves for drainage systems - requirements , test methods and evaluation of conformity
排水系统用进气阀.要求试验方法和合格评定
Air admittance valves for drainage systems - requirements , tests methods and evaluation of conformity
排水系统通气阀.要求试验方法和合格评定
Air admittance valves for drainage systems - requirements , test methods and evaluation of conformity ; german version en 12380 : 2002
排水系统通气阀.要求试验方法和合格评定