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Kelly Valve
Introduction:
Kelly valve is a manually operated ball type valve for the drill stem, divided into upper and lower sections. The upper Kelly valve is connected between lower end of swivel and upper end of Kelly. The lower Kelly valve is connected between upper end of drill pipe and lower end of Kelly or lower end of Kelly saver subs. The Kelly valve can be opened or closed off by simply turning a special operating wrench 90° according to indicated direction.
Sealing principle:
The sealing principle for Kelly valve is to ensure a close seat between the ball and the ball seat. The lower seat is supported by a spring. The force provided by the spring keep the ball securely in place with lower seat. During normal drilling operation, the hole is kept unblocked by turning the stem to “on” position; In case of kick or blowout, turn the operating stem to “off” position to close off the internal bore of drill string, the kick or blowout accident is avoided due to a high pressure sealing situation betweenball and the ball seat.
Type of kelly valve:
upper kelly valve, lower kelly valve
Available model:
CS146K CS200K XS105K XS121K XS127K XS140K XS159K XS165K XS178K
When ordering please specify:
●Upper or Lower type;
●Tool OD;
●Working pressure: 5,000 / 10,000 / 15,000 psi;
●Tool connection.
Specifications - upper Kelly valve
1 upper kelly valve CS 146K 146 4 1/2 REG 50 68.6
2 upper kelly valve CS 200K 200 6 5/8 REG 76.2 68.6
Specifications - Lower Kelly valve
1 lower kelly valve XS105K 105 NC31 40 68.6
2 lower kelly valve XS121K 121 NC38 44.5 68.6
3 lower kelly valve XS127K 127 NC38 44.5 68.6
4 lower kelly valve XS140K 139.7 NC40 57.2 68.6
5 lower kelly valve XS159K 159 NC46 61 68.6
6 lower kelly valve XS165K 165 NC46 61 68.6
7 lower kelly valve XS178K 178 NC50 , 5 1/2 FH 71.4 68.6
