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:
Apr. 02, 1991
Filed:
Apr. 09, 1990
John G Graves, Tulsa, OK (US);
Other;
Abstract
A combination valve formed of a valve body having a flow passageway therethrough and an opening in the top communicating with the passageway. A rotating member is received in the body, within the flow passageway, the rotating member having a flow passageway therethrough which is alignable with the passageway in the body and having a top opening therein communicating with the passageway through the rotating member. A checking mechanism is supported within the rotating member and moveable from a closed position blocking the passageway therethrough to an open position. A bonnet removably closes the body top opening. A stem is rotatably received in the bonnet having the inner end connected to the rotating member, the member thereby rotatable to permit the flow of fluid in one direction, the checking mechanism blocking fluid flow in the opposite direction, and by rotating the member to permit the flow of fluid in the second direction, the checking mechanism blocks flow in the first direction and wherein the rotating mechanism may be rotated to a third position wherein fluid flow is blocked in either direction and in which the bonnet may be removed to provide access to the interior of the valve and the interior of the rotating member whereby the checking mechanism may be removed and replaced when the valve is in the closed position and subject to fluid pressure.