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. 06, 2021
Filed:
Nov. 03, 2017
M-i Drilling Fluids Uk Ltd, Aberdeen, GB;
Jonathan Peter Buckland, Aberdeenshire, GB;
James Edward Atkins, Aberdeenshire, GB;
M-l Drilling Fluids UK Limited, Aberdeen, GB;
Abstract
A valve assembly () for use particularly in a deviated wellbore of an oil, gas or water well comprises a body () with an axis and first and second resiliently deformable seats () to seat a valve closure member () such as a ball, the seats being deformable to allow passage of the ball at different first and second fluid pressures acting on the seated valve closure member. The first and second seats are axially spaced from one another on a control sleeve () on opposite sides of an inner end of a selectively operable fluid outlet conduit connecting the bore with an external surface of the valve assembly, and operation of the valve assembly at pressures between the first and second pressures opens and closes the outlet while maintaining the ball between the first and second seats.