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:
Aug. 19, 1980
Filed:
Jun. 16, 1978
Izuru Morita, Sagamihara, JP;
Caterpillar Mitsubishi Ltd., Tokyo, JP;
Abstract
A relief and make-up valve assembly connects first and second passages in a fluid pressure device and includes a hollow housing having an outer valve seat communicating with the first and second passages, an outer valve member for relieving fluid from the first passage to the second passage in response to a preselected high pressure in the first passage, the outer valve member having an inner valve seat, an inner valve member for relieving fluid from the second passage to the first passage in response to a pressure in the second passage above that in the first passage, a first spring for resiliently urging the outer valve member against the outer valve seat, and a second spring for resiliently urging the inner valve member against the inner valve seat.