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:
Oct. 18, 1994
Filed:
Jun. 04, 1993
Herbert W Hoeptner, III, Morgan Hill, CA (US);
Other;
Abstract
An automatic draining back flow prevention apparatus, for use with hydrant structure, comprising tubular body structure having main passage structure between flow entrance and exit ports; the body structure having a first side port communicating with the passage structure; diaphragm structure carried by the body structure to be exposed to flow in the passage structure; a stopper in the passage structure cooperating with the diaphragm structure to pass forward fluid flow from the hydrant structure, while the diaphragm structure is positioned to block exit flow of fluid through the first side port, and to block back flow of fluid through the main passage structure when the diaphragm structure moves to unblock flow of fluid through the first side port; a first seat in the body structure exposed to the passage structure, and seating the first diaphragm as it moves to block flow of fluid through the first side port; and spring structure carried by the body structure to urge the stopper toward the first diaphragm, the spring structure and first diaphragm sized to allow the movement of the diaphragm to pass forward fluid flow when the pressure of the flow exceeds a predetermined level.