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:
Oct. 12, 1999
Filed:
Sep. 30, 1998
Applicant:
Inventors:
Kazuo Hiramatsu, Ibaraki, JP;
Makoto Ishikawa, Ibaraki, JP;
Assignee:
SMC Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
F15B / ;
U.S. Cl.
CPC ...
137270 ; 13762564 ;
Abstract
A valve body of a main valve comprises a first and a second body portions, and grooves and shallow dents are formed in both body portions to form pilot fluid channels and a plug chamber in which a switching plug is accommodated. The switching plug that switches a directional control valve between the internal and external pilot types is accommodated in such a way that its axial direction can be changed by 180.degree..