
Kelly valve is a manually operated ball type drill stem valve; it
is divided into upper Kelly valve and lower Kelly valve. 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 connected between lower end of
Kelly saver subs. The Kelly valve can be opened on or closed off by
only turning the special operating wrench at 90° according to
indicating direction. During drilling operation, the Kelly valve
shall be connected at upper end and lower end of Kelly.
The sealing principle for Kelly valve is that the ball is
positioned and provided with proceeding stress by the lower seat
supported by spring load and a close seal between ball and ball
seat is provided. During normal drilling operation, the hole is
kept unblocked by turning the stem to be "on" position; In case of
kick or blowout, turn the operating stem to be "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
between ball and ball seat.
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
O.D. (mm) | Thread connection (LH) | I.D. (mm) | Max.sealing pressure(Mpa) | |
146 | 4 1/2 REG | 50 | 68.6 | |
200 | 6 5/8 REG | 76.2 | 68.6 |
Specifications - Lower Kelly Valve
Model | O.D. (mm) | Thread connection | I.D. (mm) | Max.sealing pressure(Mpa) |
105 | NC31 | 41.3 | 68.6 | |
121 | NC38 | 50 | 68.6 | |
127 | NC38 | 50 | 68.6 | |
165 | NC46 | 61 | 68.6 | |
178 | NC50 , 5 1/2FH | 71.4 | 68.6 |
KSQ Technologies (Beijing) Co. Ltd
KSQ Technologies (Beijing) Co. Ltd. has significant experience and know-how in the supply of materials, components, finished goods, specially designed/engineered equipment, and services from China. The company caters to medium to large scale clients who are doing projects and capital expansion, as well as to firms who require support with consumable products, maintenance, and repair operations.
Our operations are based on the unique expertise of our people and knowledge with customer processes. Our portfolio includes:
KSQ Technologies (Beijing) Co. Ltd. is a company that shall cater to the needs of the construction and mining industries, with consideration on providing solutions to the following unique problems:
Covering markets worldwide, KSQ Technologies (Beijing) Co. Ltd. is distinct due to its business missions:
KSQ is guided by the following values: