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:
Jun. 04, 2002
Filed:
Oct. 11, 2000
Burton Addison Featheringill, Carson City, NV (US);
John Merril Grooms, Rochester, IN (US);
Airvac, Inc., Rochester, IN (US);
Abstract
A dual backflow check valve for use in a vacuum sewage system, wherein the check valve includes a valve body and a valve flap pivotally mounted inside the valve body, the valve body having a primary (branch) conduit and a secondary (service) conduit entering the primary conduit at an acute angle. The primary conduit has an upstream portion forming a primary inlet into the valve body and a downstream portion forming a primary outlet out of the valve body, and the secondary conduit forms a secondary inlet into the valve body. The valve flap is pivotable between two positions, a first position in which it prevents fluid from entering the secondary conduit and a second position in which it prevents fluid from entering the upstream portion of the primary conduit. Preferably, the primary conduit and the secondary conduit of the check valve are oriented in a substantially horizontal plane in the vacuum sewage system.