Patent ID: 7021605

Claim:
A control valve comprising: a pressure die cast housing including: a cylindrical bore hole for receiving a cylindrical sliding piston, a tapered chamber having an axis generally orthogonal to the bore hole and intersecting the bore hole with an inner surface formed of a housing edge wherein a plane defined by the inner surface of the chamber intersects the bore hole at an incline angle such that each point around a circumference of an intersection between the plane of the inner surface of the chamber and the bore hole is non-symmetric with a corresponding diametrically opposing point around the circumference of intersection and the chamber is formed during casting by a mold slide having a mold incline angle for removal of the mold slide from the cast housing, and a symmetric control edge formed between the chamber and the bore hole, and each point around a circumference of the control edge is located opposite to a corresponding diametrically opposing point along the circumference.