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:
Dec. 26, 1995
Filed:
Jun. 16, 1994
Koichi Hashida, Itami, JP;
Masato Yoshino, Itami, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A flow control valve having a housing having a first port and a second port and a spool mounted in the housing. A first fluid chamber and a second fluid chamber which impart a fluid pressure to both ends of the spool communicate with each other through a fluid passage formed with an orifice. As the spool moves, thrust to the spool produced by a difference in pressure at both ends of a spool balances with a biasing force produced by the biasing mechanism. The flow control valve is provided with an annular seal made of an elastic material together with a seal member. When the edge of the land portion on the outer periphery of the spool is brought into contact with the annular seal, the first port is completely shut off from the second fluid chamber. Thus, leakage will become zero when the valve portion is closed.