Patent ID: 6186413
Filing Date: 2001-02-13
Classification: B05B

Abstract:
In an irrigation sprinkler having a sprinkler case defining a hollow interior and an inlet fitting for water inflow from a water supply source into said case interior, an inlet control valve including a valve member movable relative to a valve seat between a closed position preventing water inflow into said case interior and an open position permitting water inflow into said case interior at a regulated pressure, and a water-powered sprinkler mechanism mounted within said case interior for delivering irrigation water to a surrounding terrain area when said valve member is in said open position, the improvement comprising:a flow restrictor disposed upstream from said valve seat for producing a pressure drop upstream from said valve seat when said valve member is in said open position; anda seat ring mounted on said sprinkler case at a position generally between said inlet fitting and said case interior, said seat ring having said valve seat formed thereon and further including a generally cylindrical boundary wall extending in an upstream direction from said valve seat to define a flow path at the upstream side of said valve seat; said flow restrictor being carried by said valve member to protrude into said flow path and including a radially outwardly extending metering bead formed thereon and positioned in relatively close clearance with said boundary wall to produce the pressure drop upstream from said valve seat when said valve member is in said open position.