Patent ID: 6085776
Filing Date: 2000-07-11
Classification: E03B,Y10T

Abstract:
In a water supply system the combination comprisinga) a water outlet or outlets,b) a pressurized water supply and a drain,c) a water storage chamber and a piston movable in one direction to drive water from said chamber to said drain, and in another direction to enable water flow from the drain into said chamber,d) independently controllable multiple control valves, including a valve A and a valve B, operatively connected in communication with said water outlet or outlets, with said supply and said drain, and with said chamber and said piston,e) whereby when said valve A is open and said valve B closed; or said valve B is open and said valve A is closed, or both said valves A and B are open, water flows via said valve A, or said valve B or both said valves A and B to said outlet or outlets, and water pressure drives said piston to drive water from said chamber to the drain,f) and whereby when both said valves A and B are closed, water back-flows from the drain into said storage chamber, to prevent freezing.