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:
Jan. 30, 2007
Filed:
Apr. 29, 2005
Masao Kajitani, Ibaraki, JP;
Masao Kajitani, Ibaraki, JP;
SMC Corporation, Tokyo, JP;
Abstract
Disclosed is a two-port valve in which a fluid passage between two ports is gradually openable without a rapid flow rate, by stepwise lifting a valve member off a valve sent using two pistons, to open the valve in a phased manner. A cylinder portionfor driving a valve memberhas a first pistonthrough which a valve shaftslidably extends, a sleevemovably disposed in a second pressure chamberto limit an operating stroke of the first piston, and a second pistonslidably disposed in the sleeveand connected to the shaft. In an initial phase of opening of the valve, the pistonsacting like a unit are together moved to a position at which the first pistoncontacts the sleeve, to slightly open the valve member. Thereafter, the valve memberis moved by the second pistonto its fully open position.