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:
Feb. 25, 1992
Filed:
May. 07, 1990
Philip L Cowan, Houston, TX (US);
Other;
Abstract
A low friction proportional unloading valve mechanism for pressurized fluid circuits incorporating a valve housing forming primary and bypass fluid circuits. A normally closed unloading valve normally prevents the flow of incoming fluid to the bypass fluid circuit and is opened by a pressure responsive valve actuator. The valve actuator forms a pressure responsive wall and may take the form of spaced diaphragms or a deformable flexible hose that induces opening force to the unloading valve in direct proportion to the pressure in the primary fluid circuit. Upon opening of the unloading valve, a check valve in the primary fluid circuit prevents back flow and thus maintains valve controlling pressure on the movable wall structure of the valve actuator.