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. 10, 2013
Filed:
Sep. 08, 2008
Atsushi Inoue, Gyoda, JP;
Atsushi Inoue, Gyoda, JP;
Surpass Industry Co., Ltd, Gyoda-Shi, Saitama, JP;
Abstract
A suck-back valve includes a piston and a valve body linked via a shaft portion. An open/close valve, operated by fluid pressure, is provided with a suck-back function. A suck-back chamber formed in an internal channel of the open/close valve and an actuator that operates the piston are separated by a diaphragm linked to and operating with the shaft portion. The shaft portion includes a valve-body-side shaft portion and a piston-side shaft portion. The piston-side shaft portion is loosely fitted to the valve-body-side shaft portion, allowing for independent movement in an axial direction. The closing operation of the valve body involves a two-step operation where, first, the shaft portion, along with the piston and the diaphragm, moves to the fully closed position of the valve body and where, second, the piston-side shaft portion moves with the piston and the diaphragm to increase the volume of the suck-back chamber.