| 摘要 |
An equalizing ball valve member and valve apparatus for use in a tubing string in a well bore of an oil or gas well to isolate a lower portion of the well bore below a packer including a body having a longitudinal bore therethrough connectible in a well tubing string, a lower annular valve seat supported in the body for limited sliding movement, fluid seal means between the lower valve seat and the body, an upper annular valve seat supported in longitudinal spaced relation from the lower valve seat within the body, an equalizing ball valve member supported for rotation between opened and closed positions between the valve seats, pivot members secured with the ball valve member for rotating the valve member, and a longitudinally movable operator member coupled with the pivot members for moving the pivot members longitudinally while permitting the members to traverse an arcuate path as the ball valve member rotates between an open and closed positions. The ball valve member has equalizing flow courses which reduce valve and valve seat wear and improve operating characteristics. The valve apparatus is useful in various types of well installations for production and testing procedures. The ball valve member is useful in various valve apparatus design.
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