Water leak detection and prevention systems and methods in which water is only delivered to the water pipes in the building when a faucet or appliance demands water and water is delivered through a normally closed shut off water valve. During the period that the main water is shut off, the water pressure...http://www.google.com.tw/patents/US20050224118?utm_source=gb-gplus-share專利 US20050224118 - Water leak detection and prevention systems and methods
