Electromagnetic valve and process for setting the stroke of an electromagnetic valve

Electromagnetic valve, comprising:

• a valve housing with a valve seat member and a valve closure member controlled by a magnet armature,
• a valve coil arranged around the magnet armature and delimited by a yoke ring,
• a housing portion which closes the valve housing and on which the magnet armature is supported, wherein the valve housing, the housing portion which closes the valve housing, the yoke ring and the magnet armature are made of a material which is magnetic-flux conductive, wherein the yoke ring bears against a ferromagnetic annular piece that is slipped from outwards on the valve housing on an outside surface of a ferromagnetic accommodating member which carries the valve housing, and
• a magnetic circuit including a stepped portion, wherein the stepped portion is arranged between the valve housing inserted into the accommodating member and the housing portion, and a cylindrical extension adjacent to the stepped portion the cylindrical extension being decreased in its outside diameter and extending into the valve coil to form the closed ferromagnetic housing portion,
• wherein the valve housing includes an opening at an end surface remote from the housing portion, which is conformed to the outside diameter of the valve seat member and in which the valve seat member is inserted without a clearance, the said opening being delimited by the bore bottom of the accommodating member.