Click image to view full size image
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.....
