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. 08, 2001
Filed:
Jul. 13, 1999
Stuart M. Dennistoun, Carrollton, TX (US);
Halliburton Energy Services, Inc., Dallas, TX (US);
Abstract
A flapper valve assembly (,) having a biasing flapper closure assembly (,) is disclosed. The flapper valve assembly (,) comprises tubular valve housing (,) having a hinge (,) and a longitudinal hole (,). A valve seat (,) is mounted within the housing (,) having a flow passage therethrough. A flapper closure plate (,) is rotatably disposed within the housing (,) about the hinge (,). The flapper closure plate (,) is rotatable between a valve open position and a valve closed position. The flapper closure plate (,) has a notch (,) on the side opposite its sealing surface (,) that is spaced a distance (,) from the hinge (,). The flapper closure assembly (,) includes a spring (,) mounted within the longitudinal hole (,) and a connection member (,) operably coupled to the spring (,) and engaging the notch (,) such that when the flapper closure plate (,) is moved toward the open position, the spring (,) is compressed causing the connection member (,) to urge the flapper closure plate (,) toward the closed position.