液体管道系统中存在的空气和真空袋的影响不仅会对泵、仪表和控制阀的运行产生负面影响，还可能导致管道破裂和坍塌。选择和安装正确的空气阀对所有液体管道系统至关重要。本手册提供了在水、废水和再生水管道系统中选择、调整尺寸、定位和安装空气阀的基本信息。本修订版第二版包括与废水应用有关的信息，包括大型管道系统的冲刷速度，以及安装的流入防止器装置的信息，以防止恶意篡改、冻结和洪水，并防止受污染的水进入饮用水分配系统。操作员、技术人员和工程师将使用本手册了解空气阀的设计、使用、应用和维护。 包括ANSI/AWWA标准C512中列出的空气阀类型，用于水和废水服务的空气释放阀、空气/真空和组合空气阀，以及ANSI/AWWA C514中列出的用于饮用水分配系统和储存设施的空气阀和排气流入防止器组件。本章主题包括:沿管道定位空气阀；阀孔尺寸的设计；水锤效应；以及安装、操作、维护和安全。

The effects of air and vacuum pockets present in a liquid piping system can negatively impact not only pump, meter, and control valve operation but can also be responsible for pipeline breaks and collapses. Choosing and installing the correct air valve is critical to all liquid piping systems.This manual provides essential information for selecting, sizing, locating, and installing air valves in water, wastewater and reclaimed water pipeline systems. This revised second edition includes information pertaining to wastewater applications including scouring velocities for larger piping systems, and information on an inflow preventer device installed to protect from malicious tampering, freeze and flood, and to prevent the entry of contaminated water into the potable water distribution system.Operators, technicians, and engineers will use this manual to understand the design, use, application and maintenance of air valves.The air valve types listed in both ANSI/AWWA Standard C512, Air Release Valves, Air/Vacuum, and Combination Air Valves for Water and Wastewater Service and ANSI/AWWA C514, Air Valve and Vent Inflow Preventer Assemblies for Potable Water Distribution System and Storage Facilities are covered. Chapter topics include: locating air valves along a pipeline; design of valve orifice size; water hammer effects; and installation, operation, maintenance, and safety.