
Kelly cock valve is a manual control valve in the drill string circulation system and is one of the effective tools to prevent blowout . It is upper Kelly valve and lower Kelly valve which is assembled the upper end and lower end of drill pipe. The Kelly valve can be opened on or closed off by the special operating spanner at 90 degrees according to the indicating direction.

It helps extend the life of the bit by reducing the vibration and flutter of the drilling tool.

Model | OD | ID | Conn. type | WP | |
Upper Kelly cock | XS197 | 197(7-3/4) | 76.2(3) | 6-5/8REG LH | 35MPa 70MPa 105MPa |
XS146 | 146.1(5-3/4) | 44.4(1-3/4) | 4-1/2REG LH | ||
Lower Kelly cock | XS111 | 111.1(4-3/8) | 38.1(1-1/2) | NC31 | |
XS121 | 120.7(4-3/4) | 44.4(1-3/4) | NC38 | ||
XS146 | 146.1(5-3/4) | 44.4(1-3/4) | 4-1/2REG | ||
XS165 | 165.1(6-1/2) | 71.4(2-13/16) | NC50 | ||
XS178 | 177.8(7) | 71.4(2-13/16) | NC50 | ||
XS184 | 184(7-1/4) | 71.4(2-13/16) | 5-1/2FH |





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