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:
Sep. 16, 2003
Filed:
Jan. 22, 2002
Shigeru Murata, Tokyo, JP;
Yamada T.S. Co. Ltd., Tokyo, JP;
Abstract
A restarting device of a pump change-over valve in a pump is provided, in which the pump includes; a pump main body and a change-over valve . The change-over valve is provided with a pair of pressure chambers and formed at respective ends on the back face sides of a valve body . The driving fluid is supplied into the chambers to induce a pressure difference to switch the direction of movement of the valve body . Also, the pump main body is provided with a balancing valve whose end portions A and B face driving chambers A and A, respectively. If the change-over valve malfunctions and the pressures in the two driving chambers B and B are balanced, the balancing valve is held in an intermediate position and will then induce a pressure difference between the two pressure chambers and