Water supply systems have been a part of civilization for since the early ages where water was usually supplied to home via canals. Many others had wells that were constant sources of water which people had to physically draw. But, over time, the implementation of technology has made the process easier with the installation of modern plumbing solutions as well as pumps to supply water. Most of these pipes an intricate network in them and are fitted in a way that they do not burden the main source.
The Nickel Clapper wafer style butterfly valve is designed to maintain a seal against bi-directional pressure differential to prevent any backflow in systems designed for unidirectional flow. It accomplishes this with a tightly fitting seal; i.e., gasket, o-ring, precision machined, and a flat valve face on the upstream and downstream sides of the valve.