Patent ID: 8205858

Claim:
An electromagnetic pressure regulating valve, comprising: a valve portion for conducting and regulating a pressure of a working medium, such as oil; a magnet portion for actuating the valve portion for regulating the pressure of the working medium and having a magnet housing with a pole piece, said pole piece being provided with a bore; an adjusting ball provided in bore of the pole piece, wherein said adjusting ball is press-fit in said bore such that the adjusting ball seals an inner region of the pressure regulating valve; an armature, upon which magnetic force can be exerted as needed, located in the magnet housing; and a spring with a spring force generating a pressure activation threshold to be overcome in a regulation and located between the armature and the adjusting ball, wherein the spring is positioned to contact the adjusting ball with one end and the armature with another end, wherein the spring has regions of different diameter, wherein the spring has a thickened region, in which the spring has an outside diameter which is slightly smaller than an inside diameter of the bore in which the adjusting ball is located, wherein the spring has a thinned region with an outside diameter that is smaller than a different region of the spring, and the thinned region is provided in a middle of the spring, wherein the thickened region rests substantially without friction on an inside of the bore.