Kelly cock

Rotary equipment refers to the pieces of surface equipment in drilling operations that actually rotate or impart rotating motion to the drill pipe. This equipment includes the upper members of the drill string such as the swivel, swivel sub kelly cock, kelly, lower kelly valve, and kelly sub (Figure 4-87), as well as the kelly bushing and rotatary table [13]. 

The kelly cock and lower kelly valve are manually operated valves in the circulating system. 

Close the safety valve (kelly cock) on the drillpipe. 

Kelly hose burst during well control procedure, Kelly cock and in-line safety valve could not be closed. 

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