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:
May. 04, 1999
Filed:
Sep. 03, 1997
Applicant:
Inventor:
Koichi Yoshihara, Fujisawa, JP;
Assignee:
Freudenberg-NOK General Partnership, Plymouth, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
251331 ; 251 611 ; 92 96 ;
Abstract
A diaphragm valve having a diaphragm functioning as a valve body. Unlike the conventional valve of this type, the retainer for pressing the sealing section of the diaphragm against the valve seat is provided with a predetermined number of rectangular apertures or concave portions at specified positions thereon so that when the valve is operated in a low temperature atmosphere or a high temperature atmosphere, the diaphragm is prevented from sticking firmly to the valve sheet due to freezing or heating thereby allowing the valve to perform an accurate valve opening operation without changing its pressure and flow rate characteristics.