KELLY VALVE

KELLY VALVE

TECHNICAL SUMMARY

Kelly valve also named kelly cock or drill pipe safety valve, which is located within the drill string that allow for free-passage of drilling fluid without pressure loss. It is a hand control valve in drill string circulating system and it is one of the effective tools to prevent blowout.
Kelly valve is specifically designed for effective control of blow outs and/or mud loss control. It can be divided into upper kelly cock valve and lower kelly cock valve. The upper kelly cock is connected between lower end of swivel and upper end of kelly; the lower kelly valve is connected between lower end of kelly saver sub. 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, both upper and lower Kelly cocks should be connected to prevent accident during drilling operation.

SPECIFICATION

  • Model

    O.D.

    (mm)

    Thread connection

    (LH)

    I.D.

    (mm)

    Max. sealing pressure

    (Mpa)

    CS 146

    146

    4 1/2 REG

    50

    68.6

    CS 200

    200

    6 5/8 REG

    76.2

    68.6

  • Model

    O.D.

    (mm)

    Thread connection

    I.D.

    (mm)

    Max. sealing pressure

    (Mpa)

    XS105

    105

    NC31

    41.3

    68.6

    XS121

    121

    NC38

    50

    68.6

    XS127

    127

    NC38

    50

    68.6

    XS165

    165

    NC46

    61

    68.6

    XS178

    178

    NC50 , 5 1/2FH

    71.4

    68.6