Water shutoff system

A shutoff system for shutting off a fluid line in response to fluid flow through the line, said shutoff system comprising:

• a normally closed electrically controlled valve for connection into the fluid line so that, upon non-energization and closing of said valve, fluid flow through the fluid line is prevented, and upon energization of said valve, said valve is opened in response to an electrical signal;
• fluid flow sensing means for serial connection in the fluid line with said valve for sensing fluid flow, said sensing means producing an electrical signal in response to fluid flow through said sensing means;
• and
• an electrical circuit having an automatic line, said automatic line interconnecting said sensing means and said valve, said automatic line having a latching relay connected to said sensing means and said valve so that when said latching relay is closed energization of said automatic line puts said automatic line in automatic mode so that the sensing of fluid flow by said fluid flow sensor causes unlatching of said latching relay and closing of said valve, said circuit also having a function line connected to said valve so that when said function line is energized by said circuit the sensing of fluid flow does not cause valve closing.