Back to m51 air valves air release air vacuum and combination second edition the safe and efficient operation of a liquid piping system is dependent on the continual removal of air and wastewater gases from the liquid piping system. 1 awwa manual m51 chapter 1 introduction air valves are hydromechanical devices designed to automatically release air and waste water gases or admit air during the filling draining or operation of liquid piping systems. 9781583211526 air release air vacuum combination air valves m51 awwa manual of water supply practice awwa manuals by american water works association. Preface 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. 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 book jacket
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