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Profile: kelly cock is drillstring circulatory system manual control valve, is one of the effective tools to prevent the blowout. Kelly kelly cock cock into upper and lower kelly cock two kinds of party. Between the upper kelly cock faucet for the lower and upper kelly lower kelly kelly cock for the lower and upper end of the drill pipe or kelly joint between the upper protection. With a special wrench instructed the rotary key switch 90 can be realized. In the drilling operation, in order to avoid the occurrence of accidents blowout, shall in kelly, kelly cock and lower ends meet. How it works: kelly cock valve includes kelly kelly and lower valve, were placed in the upper and lower ends of the kelly. 90 ° rotation can be achieved with a special wrench switch, plug sealed by a spherical body and the valve seat by a rigid sphere with, plus auxiliary rubber seal to complete, end-plus spring preload, if time after blowout, close stopcock , the well pressure the greater the pressure on the valve seat, plug sealing the better. |