Product Description
Kelly valve also named Kelly cock or drill pipe safety valve. 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 divided into Upper Kelly Valve and Lower Kelly Valve. Upper Kelly Valve
is connected between swivel sub and Kelly. Lower Kelly valve is connected between lower
end of Kelly and top of drill pipe or lower end of Kelly save sub. Rotating the wrench of
full opening safety valve 90° to realize on and off. In the drilling operation, in order to avoid
malignant accidents, Kelly valves should be connected to both end of Kelly to prevent the
loss of drilling fluid and blowout.
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