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:
Aug. 13, 1996
Filed:
Jan. 21, 1994
Takashi Ogawa, Hiratsuka, JP;
Kazuo Yoshimoto, Hiratsuka, JP;
Kensuke Uchiyama, Hiratsuka, JP;
Harushige Ibe, Yokohama, JP;
Yoshiharu Arai, Yokohama, JP;
Taketoshi Shiraishi, Yokohama, JP;
Yoshinori Gotoh, Yokohama, JP;
Japan Tobacco Inc., , US;
Mitsubishi Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A rotary valve apparatus comprises a rotor housing having an inlet and an outlet, a rotor rotatably fitted in the rotor housing, a plurality of pockets arranged at regular intervals in the circumferential direction on the outer peripheral surface of the rotor and adapted to be connected successively to the inlet and the outlet of the rotor housing as the rotor rotates, two communication ports arranged in separate regions extending from the inlet to the outlet of the rotor housing and from the outlet to the inlet, respectively, with respect to the rotating direction of the rotor, and pressure equalizing pipes for connecting one communication port in one region with the corresponding communication port in the other region. As the rotor rotates, the pockets moving from the inlet toward the outlet and the pockets moving from the outlet toward the inlet are subjected to two cycles of pressure equalization by means of one and the same equalizing pipe.