Kelly Swivel Valve

Definition(s)


Kelly swivel valve (kelly cock or upper kelly valve)

A valve located between the kelly swivel and the kelly, used for well control when the kelly is in the hole. It works like a check valve when engaged.

Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards