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. 06, 1993
Filed:
Jun. 05, 1992
Applicant:
Inventors:
Takeki Nogami, Takamatsu, JP;
Kunio Matsushita, Takamatsu, JP;
Susumu Watanabe, Hiratsuka, JP;
Yuzo Hashimoto, Fujisawa, JP;
Assignees:
Shikoku Research Institute Inc., Kanagawa, JP;
Shikoku Electric Power Company, Inc., Kanagawa, JP;
Nippon Gear Co., Ltd., Kanagawa, JP;
Primary Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
137554 ; 137553 ; 137552 ; 25112911 ; 2512495 ; 7442 / ; 73162 ;
Abstract
A valve stem driving apparatus comprises a valve stem which has first and second ends, the second end being connected to a valve body. The valve stem is engaged with a stem nut. A distance measuring device is provided in an upper cover for the valve stem and measures a distance between the upper cover and the first end of the valve stem, so that wear rate of the valve stem and/or the stem nut is determined.