About this document
Kelly Valve Operation in Drilling by octgdrillstem.inspectionreports is a document available to read on EtoBox.
The document summarizes the Kelly valve/cock, which is a manually operated ball type drill stem valve. The Kelly valve can be opened or closed by turning a special operating wrench 90 degrees. It is divided into upper and lower Kelly valves, with the upper connecting the swivel to the Kelly and the lower connecting the drill pipe to the Kelly. The Kelly valve seals by a ball positioned and stressed by a lower seat and spring, providing a close seal between the ball and seat.
- Author
- octgdrillstem.inspectionreports
- Language
- EN