Abstract: A bistable solenoid valve with an armature in the form of a movable core disposed within a core guide tube. The armature is resettable by a spring force with one single electromagnetic winding surrounding the tube. The movable core is mechanically coupled with a locking mechanism which is alternately engageable and releasable. A second locking member is longitudinally displaceable against a first member and, in its lifted position, is rotatable through a preset angle. The two locking members, as well as the spring and the movable core, are supported within the core guide tube and surrounded by the fluid medium. The core guide tube is open at one end facing the valve chamber and closed at the other end.