Patent ID: 6622933
Filing Date: 2003-09-23
Classification: A01G,Y10T

Abstract:
A lawn sprinkler system, comprising:a master controller having an input coupled to a water supply and an output, said master controller adapted to be preprogrammed to supply water from the input to the output for a predetermined plurality of phases of operation, said master controller advancing to a subsequent phase of operation by discontinuing the supply of water from the input to the output for a predetermined amount of off time followed by supplying the water from the input to the output for a predetermined amount of on time; first and second valves each having an in-port and an out-port, adapted to operate in each of said predetermined plurality of phases of operation and adapted to advance to a subsequent phase of operation upon discontinuation of water supplied under pressure to the in-port followed by the supply of water under pressure to the in-port, said first valve being pre-set to supply water received by its in-port to its out-port only during one of said predetermined plurality of phases of operation; said second valve being pre-set to supply water received by its in-port to its out-port only during another of said predetermined plurality of phases of operation, said one and said another of said predetermined plurality of phases of operation being different; tube coupling the output of the master controller to both said in-port of said first valve and said in-port of said second valve, wherein each of said first and second valves includes: a housing having a chamber, said housing including the in-port and the out-port; a piston disposed within the chamber of the housing, the piston including a sealing disk adapted to divide the chamber into separated top and bottom chambers, said sealing disk having a top surface defining a surface of the top chamber and a bottom surface defining a surface of the bottom chamber, said in-port being coupled to the bottom chamber, said out-port being disposed above the sealing disk, said piston being movable upwards and downwards within the chamber in accordance with pressure on the piston; said piston being adapted to rotate within the chamber of the housing a first predetermined distance when the piston rises within the chamber to a predetermined first position; said piston being adapted to rotate within the chamber of the housing a second predetermined distance when the piston descends within the chamber, in accordance with a release of pressure, to a predetermined second position; said sealing disk including a sealing disk port hole extending between the top and bottom surfaces of the sealing disk and having substantially the same size as the out-port of the housing, said sealing disk port hole being adapted to supply water within the bottom chamber of the housing to the out-port when the sealing disk port hole is at an angular position in coincidence with the out-port.