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. 12, 1992
Filed:
Jun. 01, 1990
Takaomi Hanyu, Yamato, JP;
Kouki Tada, Yokohama, JP;
Benkan Corporation, Tokyo, JP;
Abstract
A metal diaphragm valve includes a valve casing and an inverted bowl-shaped metal diaphragm made of an elastic material and having a downwardly projecting collar disk made integral with the metal diaphragm in its center. The metal diaphragm defines within the valve casing a valve chamber into which one end of each of a pair of inlet and outlet passages open, with their opposite end being connected to an external pipe system for cleaning fluid. The vertical movement of a valve stem supported in the valve casing causes the metal diaphragm to move into contact with or away from an annular valve seat that is formed above the valve chamber. When the valve stem is forced down, the metal diaphragm is bent downward against its elasticity to bring its collar disk into close contact with the valve seat, closing the valve chamber. When the valve stem is uplifted, the metal diaphragm restores back to its original position, with the collar disk moved away from the valve seat, opening the valve chamber. Because of this design, there will be no waving of the diaphragm when pressed against the valve seat. Also, the valve seat has a hardened top surface where it is contacted with the collar disk, less scratching would occur due to impacts when the collar disk is bumped against the valve seat in its closing action, minimizing the generation of metal particles.