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:
Jul. 30, 1996
Filed:
Aug. 18, 1994
Tetsuzo Yamamoto, Yokohama, JP;
Katsumi Yamada, Fujisawa, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A steam isolation valve system for opening and closing a steam flow passage of a steam flow comprises a valve body, a valve disk accommodated in the valve body to be reciprocatingly movable for opening and closing the steam flow passage, and a drive mechanism for moving the valve disk along an axial direction of the valve body. The steam flow passage has a portion elliptical in section having a short axis in a direction of the reciprocating axis of the valve disk projected on a plane perpendicular to an axis of the steam flow passage. The steam flow passage has a throttling inlet passage which is deformed in shape from a circular tube portion having a diameter D on a steam upstream side to an elliptical tube portion having a long side diameter D and a short side diameter D cos.theta. (45.degree..ltoreq..theta..ltoreq.65.degree.) on a steam downstream side, an intermediate passage which has an elliptical shape of the same diameters as that of the elliptical tube portion of the inlet passage and to which is connected a tube in which the valve disk is reciprocated with an inclination .theta. with respect to the axis of the steam flow line, and enlarging outlet passage which is deformed in shape from an elliptical tube portion having the same diameter as that of the elliptical tube portion of the intermediate passage at a steam upstream side to a circular portion having a diameter D at a steam downstream side.