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. 22, 1977
Filed:
Sep. 17, 1975
Applicant:
Inventor:
Heinz Werner Braukmann, Willowdale, CA;
Assignee:
Braukmann Armaturen AG, Rothrist, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E03C / ;
U.S. Cl.
CPC ...
137218 ;
Abstract
A back flow preventer valve has an annular resilient diaphragm secured to the valve body between the inlet and outlet valves; the diaphragm supports an annular wall member which closes off a vent. In the event of back flow, the pressure on the membrane raises the annular wall from the vent to open the latter and the back flow does not cause contamination. The feature of the valve is a seal formed by the valve body and the annular wall engaging in the event of diaphragm failure, thus ensuring that the back flow travels through the vent.