The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 25, 1989
Filed:
Sep. 06, 1988
Bruce E Latvala, Grafton, OH (US);
Allied-Signal Inc., Morristown, NJ (US);
Abstract
A proportioning control valve for heavy duty fluid pressure braking system includes a proportioning piston which is normally held in engagement with an abutment by control pressure. A tare pressure spring urges a caging member into engagement with a stop which is spaced a predetermined distance from the end of the proportioning piston, which is less than the distance between the valve engaging member carried by the proportioning piston in the proportioning valve member. Upon loss of pressure at the control pressure port, the proportioning piston is urged toward the caging member. The proportioning piston moves between the gap defined between the end of the proportioning piston and the caging member without opposition from the tare pressure spring, thereby permitting the full force of fluid pressure to break seal friction between the seals carried by the proportioning piston and the wall of the housing.