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. 05, 1994
Filed:
Jul. 08, 1993
Miyoshi Kimura, Yabutsukahonmachi, JP;
Benkan Corporation, , JP;
Abstract
An improved metal diaphragm valve is disclosed, in which the bed of the valve casing is made wider in its surface where the valve seat is mounted, than in conventional valves. The sufficiently spacious bed surface enables polishing easier, particularly in assembling micronized sizes of a valve. The simple design also makes it possible to use multiple-stage electropolishing, a technology used to obtain a mirror-like surface of casing bed. Since the bed of the valve casing has a wide enough space between the inner casing wall and the annular valve seat, the likelihood of fluid stagnation is lessened, causing fluid to flow smoothly from the inlet to outlet passage. The widened casing bed surface design is obtained because the annular valve seat caulked in position by expanding the rim of the inlet port in the fluid entrance passage that is bored concentrically of the central annular seat. This arrangement eliminates the conventional pair of collars used to securely fix the annual valve seat along both circumferences thereof.