Patent ID: 9328584
Filing Date: 2016-05-03
CPC Classification: E21B

Claim Text:
1. A wellbore ball valve, comprising: a ball-type valve closure having an interior, central bore; a ball carrying assembly defining an annular, sealing seat surface in contact with and adapted to seal with the exterior of the valve closure, the seat surface defining a first through hole that communicates with the central bore when the valve closure is open and is sealed from the central bore when the valve closure is closed; and an upper assembly defining an annular ball contacting surface in contact with the exterior of the valve closure, the ball contacting surface defining a second through hole that overlaps an opening of the central bore when the valve closure is open and does not overlap the opening of the central bore when the valve closure is closed, the second through hole being non-circular shaped to at least partially overlap with the central bore while the first through hole is sealed from the central bore when the valve closure is between open and closed.