AWWA - M51
Air-Release, Air/Vacuum, & Combination Air Valves
|Publication Date:||1 January 2001|
This manual is a guide for selecting, sizing, locating, and installing air valves in water applications. It is a discussion of recommended practice, not an American Water Works Association (AWWA) standard. It provides guidance on generally available methods and capacity information. Questions about specific situations or applicability of specific valves should be directed to the manufacturer or supplier.
Information contained in this manual is useful for operators, technicians, and engineers for gaining a basic understanding of the use and application of air valves. There are many special water pipeline applications that are beyond the scope of the methodology given in this manual and may require special tools such as computer programs for analysis of hydraulic transients. The valve capacity information is generic information. Actual capacity charts of the intended manufacturer's valve should be consulted before making the final selection of valve size and options. The manual provides information only on the air valve types listed in AWWA Standard C512, latest edition, including the following:
• Air-release valve
• Air/vacuum valve
• Combination air valve
Wastewater air valves, vacuum breakers, slow-closing air valves, and throttling devices are only introduced in this manual. Other sources of information should be consulted for the use and application of these devices.
This manual refers to AWWA standards, which are available for
purchase from the AWWA Bookstore by calling (800) 926-7337 or
Manufacturers graciously provided valve illustrations and other documentation. AWWA does not endorse any manufacturer's products, and the names of the manufacturers have been removed from the material provided.
Metrication Note: Valve sizes are listed in their current US designation, i.e., nominal pipe sizes in inches. To obtain an approximate metric equivalent, use a conversion factor of 25.4 mm per inch.