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:
Jan. 14, 1992
Filed:
Feb. 05, 1991
Werner Gnauert, Iserlohn, DE;
Hans-Jurgen Jensen, Welver-Scheidingen, DE;
Friedrich Grohe Armaturenfabrik GmbH & Co., Hemer, DE;
Abstract
A backflow preventer used in combination with a plumbing fixture has a pressurizable supply line, an output hose that can be equipped with a sprayer or shower, and a drain. It further has a valve casing having an inlet valve seat forming an inlet port connected to the supply line, a vent valve seat forming a vent port opening to the atmosphere, and an outlet port opening laterally between the seats and connected to the supply hose. A valve body is movable in the casing between a normal-flow position on the vent seat blocking the vent and permitting flow between the inlet and outlet ports and a backflow-preventing position on the inlet seat blocking the inlet port and permitting flow between the outlet and vent ports. A spring or the like biases the valve body toward the inlet seat into the backflow-preventing position with a pressure sufficient to overcome atmospheric pressure at the inlet port so as to permit movement of the valve body into the normal-flow position when pressure at the inlet port substantially exceeds atmospheric pressure.