Patent ID: 6973941

Claim:
A control valve comprising: a valve housing defining an inlet port and an outlet port; a metal ring defining a central orifice and being permanently attached to the valve housing, the metal ring connecting the inlet port and the outlet port and including a tapered external surface for engaging a matching tapered bore within the valve housing; and a movable valve plug disposed between the inlet and the outlet, the moveable valve plug having a cylindrical skirt portion slidably engaged within the central orifice, the cylindrical skirt defining a plurality of tapered openings cooperating with the inlet port and outlet port, the cylindrical skirt portion including a lower terminating end incorporating one or more concave openings wherein at least one of the plurality of openings is a slot that expands from the outside diameter of the cylindrical skirt portion at an angle of no less than approximately 8 degrees and no more than approximately 30 degrees.