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:
Mar. 01, 1977
Filed:
Oct. 31, 1974
Roydon B Cooper, Locust Valley, NY (US);
Pall Corporation, Glen Cove, NY (US);
Abstract
Hydrostat systems are provided containing a coaxial multidirectional flow control valve interposed between a pump and a hydraulic motor, to direct flow in one direction through one path and to direct flow in the opposite direction through another path, to provide a bypass function, such as to bypass a filter. The valves are space-saving, can be kept closed under low biasing forces, and can be made light in weight, affording a low-mass valve that can be moved in milliseconds from a closed to an open position. The valves can control not only different forward and reverse flow paths, but also a path for a bypass function such as relief flow through one of the forward and reverse flow paths. When two valves are used, unidirectional flow through can be achieved regardless of direction of flow in the fluid line.