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:
Nov. 13, 1990
Filed:
Feb. 07, 1990
Applicant:
Inventor:
John G Graves, Tulsa, OK (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
1372695 ; 13763015 ;
Abstract
A reversible flow check valve includes a valve body and a clapper extending across a flow passageway. A mechanism is provided to retract the clapper to permit essentially unobstructed fluid flow through the flow passageway. Further, mechanisms are provided for rotating the clapper to a first position or an opposite second position or an intermediate position to permit fluid flow in either direction. The retraction of the clapper permits the valve seats and seals to be unaffected by the rotation of the clapper, thereby preventing damage to the internal sealing mechanisms of the valve when the flow direction of the valve is reversed.