Download or read book Air-release, Air/vacuum, and Combination Air Valves written by and published by American Water Works Association. This book was released on 2001 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Operators, technicians, and engineers will find the information in this manual useful for gaining a basic understanding of the use and application of air valves. A valuable guide for selecting, sizing, locating, and installing air valves in water applications, M51 provides information on air valve types listed in AWWA Standard C512, latest edition, including the following: air-release valve; air/vacuum valve; and combination air valve.