Patent ID: 6575189
Filing Date: 2003-06-10
Classification: G05D,Y10T

Abstract:
An automatic valve comprising:a housing having an inlet passage and a passage to outlet; a linearly movable shaft disposed in said housing having two stops separated by a predetermined distance; a hydraulic unit connected to said housing and to said linearly movable shaft; and, a sealing flange having at least one aperture accommodating said linearly movable shaft, said sealing flange being movable on said linearly movable shaft to close and open said passage to outlet through force of one of said stops on said sealing flange, said linearly movable shaft being biased to urge said sealing flange toward said passage to outlet by contact with one of said stops wherein said sealing flange in position to close said passage to outlet from said inlet passage despite limited movement of said linearly movable shaft, and at least one relatively small aperture for transferring part of the flow from said inlet passage to said passage to outlet.