Upper and Lower Kelly Valve

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......

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