Updated from the 1996 edtion, this operations manual provides practical information on selecting, installing, field testing, and maintaining distribution valves in potable water systems.á It covers the most commonly used values including globe, butterfly, plug, ball, cone, gate and check. Unloading, inspection, storage, installation, testing, maintenance, and record-keeping are described in detail along with the history and theory. This manual will be particularly usefeul for small and medium sized organizations.