Fluid flow control valve especially for use in heating installations for

Abstract

A fluid control valve, controlling flow of hot water through a heating arrangement for motor vehicles, comprises a pot-shaped guide sleeve in which the armature of an electromagnet is movable in axial direction, and to which a valve member is connected by a push rod, which extends through an axial bore of a magnet core fixed in the guide sleeve. The facing ends of armature and core are spaced a small distance when the valve member engages a valve seat in the valve housing between an inlet and an outlet socket. The guide sleeve is flowed through by water passing through the valve. The magnet core is clamped in the guide sleeve with a clamping force greater than the axial force acting on the core. The magnet core is positioned in the guide sleeve by first moving the core closer to the armature and then imparting to the latter a predetermined axial force in closing direction of the valve. The armature strikes the core with the great sudden impact and displaces the core until the valve member is pressed with a predetermined force against the valve seat to thus absorb the axial force. Thereafter the desired distance will be maintained when the normal closing force is applied to the armature. The valve member is normally held in open position by a coil spring and the opening stroke of the valve member is limited by a rubber disk abutting against a planar sieve disk fixed to the valve housing between the core and the valve member. The sieve disk, is supported by a bowl-shaped spacer member.