Patent ID: 7017611
Filing Date: 2006-03-28
Classification: B01D

Abstract:
1. A flow restrictor defining a restricted flow path for liquid, said flow restrictor comprising: a housing defining an elongated conduit having a tapering conical wall defining a first screw thread and a water-channel thread extending therealong including generally between a first opening into a distal region of the conduit for receiving a flow of liquid and a second opening into a proximal region of the conduit, and an axially elongated plug received into said conduit, with a surface of said plug opposed to said tapering conical wall and defining a second screw thread and a smooth tapering surface, said second screw thread disposed in threaded engagement with said first screw thread defined by said tapering conical wall of said housing, and opposed surfaces of said water-channel thread of said housing and said tapering surface of said plug being disposed in sealing engagement within said conduit, said water-channel thread of said housing and said tapering surface of said plug cooperatively defining a generally spiral liquid flow path along said conduit for flow of liquid generally between said first opening and said second opening for delivery of liquid from the conduit; wherein the plug comprises a first material, the housing compnses a second material harder than the first material, and sealing engagement comprises penetrating engagement of the water-channel thread of the housing with the tapering surface of the plug.