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:
May. 29, 1990
Filed:
Aug. 07, 1989
John G Graves, Tulsa, OK (US);
Other;
Abstract
A combination plug and two-way check valve formed of a valve body having a flow passageway therethrough, the body having an opening in the top communicating with the passageway, first and second valve seats in the body, a ball member rotatably received in the body between the seats, the ball having a flow passageway therethrough which is alignable with the passageways in the seats and having a top opening therein communicating with the passageway through the ball, a clapper pivotally supported within the ball and pivotal in a closed position blocking the passageway therethrough in an open position, a bonnet removably closing the body top opening, a stem rotatably received in the bonnet having the inner end connected to the ball, the ball being thereby rotatable to permit the flow of fluid in one direction, the clapper blocking flow of fluid in the opposite direction, and by rotating the ball 180.degree. to permit the flow of fluid in the second direction, the clapper blocking flow in the first direction and wherein the ball 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 into the interior of the ball whereby the clapper may be removed and replaced when the valve is in the closed position and subject to fluid pressure.