Kelly splash valve is a wellhead drilling tool capable of utilizing the fluid flow pressure of a drilling fluid to open and close a kelly nozzle channel automatically and being connected to a lower protecting joint of the kelly. With the adoption of the kelly splash valve, the drilling fluid is prevented from splashing from a kelly nozzle to a drilling platform even after the kelly is detached during single joint connection or tripping operation; and therefore, not only can the waste of the drilling fluid be reduced, but also the pollution on operation environment caused by the drilling fluid is avoided.
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