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Drilling Tools Kelly Valve, Kelly Cock for Drilling Rig

Kelly Valve also named Kelly Cock/Drill Pipe Safety Valve allowing free passage of drilling fluid without pressure loss. The valve can be used as a dill pipe safety valve or upper Kelly valve to control blowout pressures, or as a lower Kelly Valve to prevent loss of drilling fluid when the Kelly is disconnected. It has a pressure rating of 5,000psi or 10,000psi or 15,000psi.
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Drilling Tools Kelly Valve, Kelly Cock for Drilling Rig


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Descriptions

Kelly Valve also named Kelly Cock/Drill Pipe Safety Valve allowing free passage of drilling fluid without pressure loss. The valve can be used as a dill pipe safety valve or upper Kelly valve to control blowout pressures, or as a lower Kelly Valve to prevent loss of drilling fluid when the Kelly is disconnected. It has a pressure rating of 5,000psi or 10,000psi or 15,000psi.



Specifications


Kelly valve is a manually operated ball type drill stem valve; it is divided into upper Kelly valve and lower Kelly valve.



Kelly Valve features:


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


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


Specifications - Lower Kelly Valve

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



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