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:
Mar. 20, 2001
Filed:
Jun. 18, 1997
Frank A. Stearns, Houston, TX (US);
Valco Instruments Company, Inc., Houston, TX (US);
Abstract
This disclosure sets forth a diaphragm valve operative with N ports deployed in an upper head. The ports all connect to a diaphragm having a bead defining a flow path around the diaphragm connecting all the ports. In the cylinder below the upper head, there are upper and lower pistons which are forced apart to define a fluid receiving chamber. The fluid receiving chamber is enlarged on the introduction of fluid above a certain pressure thereby raising half of the piston rods bearing against the diaphragm and reduction of fluid pressure in the chamber lowers those push rods and raises an alternate set of push rods to accomplish diaphragm switching by deformation of the resilient material defining the diaphragm.