API Kelly valve/kelly cock/Drill Pipe Safety Valve

1. Descriptions:

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 or 15,000psi