Patent ID: 7121293
Filing Date: 2006-10-17
Classification: E03B,F16K,Y10T

Abstract:
1. A tri valve backflow prevention apparatus for use with a temporary conventional backflow prevention assembly between existing water main pipe and water main pipe under construction, and which permits activation of the water main pipe under construction and removal of the conventional temporary backflow prevention assembly without water in the water main pipe under construction being drained after its required pressure and bacterial testing is successfully completed, and also without the wasteful practice of additional water being needed to flush and refill the emptied water main pipe under construction, and without exposure of the emptied water main pipe under construction to contamination on the construction site and the need for flushing the emptied water main pipe with good drinking water to remove such potential contamination, said tri valve backflow prevention apparatus comprising: a tri valve housing with a main valve body and two side valves, said main valve body configured for connection between existing water main pipe and water main pipe under construction, and both of said side valves configured for connection to a temporary backflow prevention assembly; and easily accessible means for opening and closing said main valve and each of said side valves so that during water main construction said main valve body remains closed and said two side valves are allowed to remain open to provide water needed at the construction site via said temporary backflow prevention assembly, and when all construction and testing is completed, said easily accessible opening and closing means are used to close said two side valves and thereafter open said main valve for immediate activation of water main pipe for drinking water delivery to the public and removal of the temporary backflow prevention assembly without causing any water to be drained from the water main pipe under construction.