Flow-controlled irrigation system

An irrigation system for use with a pressurized source of water comprising a hollow valve housing which defines an upwardly extending hollow cylinder with top and bottom portions, said top portion defining a first annular outlet, said housing also defining an annular inlet in a lower portion thereof which is above said bottom portion by a distance which is approximately equal to the diameter of said annular inlet for connecting said housing to the pressurized source of water, said housing further defining a second annular outlet in said lower portion thereof with said second annular outlet being axially aligned with said annular inlet, an upwardly extending gate member slidably disposed within said hollow cylinder of said housing and adapted to move upwardly and downwardly within said hollow cylinder, said upwardly extending gate member defining a first passageway in an upper portion thereof for connecting said first annular outlet and said inlet when said gate member is in a first position so that water can flow through said housing and out of said first annular outlet, said upwardly extending gate member further defining a second passageway in a lower portion thereof for connecting said annular inlet and said second annular outlet when said gate member is in a second position so that water can flow through said housing, an upwardly extending pipe connected to said first annular outlet and means for directing a flow of water outwardly from said upwardly extending pipe, flow responsive means operatively associated with said gate member for moving said gate member from its first to its second position in response to a predetermined volume of water passing through said flow responsive means so that the flow of water passing through said inlet will flow through said second passageway and out of said second outlet and in which said flow responsive means includes a cylindrical element having a pair of slightly resilient arms which define an S-shaped stop means for rotating said cylindrical element in a first direction and for preventing rotation in an opposite direction.