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:
Nov. 09, 2004
Filed:
Apr. 07, 2003
Applicant:
Inventor:
Masao Kajitani, Tsukuba-gun, JP;
Assignee:
SMC Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16K 3/1143 ; F16K 3/1163 ; F16K 3/1363 ; F16K 3/1383 ;
U.S. Cl.
CPC ...
F16K 3/1143 ; F16K 3/1163 ; F16K 3/1363 ; F16K 3/1383 ;
Abstract
A first piston and a second piston are accommodated in a piston chamber of a cylinder. The first piston is connected to a main valve member which opens and closes a main flow passage. The second piston is connected to a second rod having a stopper whose position can be adjusted. Pressure fluid is supplied to the second pressure chamber to move the second piston forward to a position where the stopper abuts against the abutting portion. In this state, pressure fluid is supplied to the first pressure chamber to move the first piston to a position where the first piston abuts against the second piston, thereby opening the main valve member by a stroke of the first piston.