| 摘要 |
<p>A self-closing valve is provided at a zone of a circumferential wall section of its housing that bounds a relief chamber with a stripping and holding-back arrangement which includes a saw-tooth formation constituted by a plurality of teeth and is situated at an end portion of the wall section that is close to the inlet of the valve housing. The teeth of the formation have respective substantially radially extending flanks and steep inclined flanks which are operative for stripping off contaminant particles which are entrained for joint movement by a sealing lip of a piston seal that is mounted for joint movement on a valve piston received in the wall section from the sealing lip during the movement of the valve toward its closing position, and for holding such contaminant particles back during the movement of the valve piston towards its open position. The zone provided with the formation is exposed to the action of the fluid medium flowing between the inlet and the outlet of the valve housing when the valve piston is out of its closing position, so that the contaminant particles are flushed by the flow of the fluid medium away from the zone containing the saw-tooth formation.</p> |
