Lip seal ring and its plug valve

Abstract

The invention discloses a lip-shaped sealing ring and a plug valve thereof and belongs to the technical field of drilling devices. The lip-shaped sealing ring comprises an annular sealing ring body. The lips of the lip-shaped sealing ring are located on the two side faces of the sealing ring body, and a lip opening facing the external diameter of the sealing body is formed between the two lips; the plug valve comprises a lower valve seat, an upper valve seat, a valve core and a valve rod which are assembled in a valve body in a matched mode, a first sealing piece is arranged between the lower valve seat and the valve body, and a second sealing piece is arranged between the valve rod and the valve body; and a third sealing piece is arranged between the upper valve seat and the valve body, and the first sealing piece is the lip-shaped sealing ring and arranged between the end surface of the lower valve seat and the end surface of the valve body. According to the lip-shaped sealing ring, sealing between panels can be achieved, the plug valve is simple in structure, and the problem that drilling operation is influenced by the condition that a traditional square drilling rod plug valve is large in opening difficulty under the high pressure is solved, a low-torque plug valve opened through a single person under the 70 MPa differential pressure can be achieved, and the requirements for markets and production sites are well met.

Description

technical field

[0001] The invention relates to a lip-shaped sealing ring and a cock valve using the lip-shaped sealing ring, in particular to a lip-shaped sealing ring and a cock valve structural design for a kelly cock valve with depressing torque, belonging to the technical field of drilling equipment . Background technique

[0002] The kelly plug valve is a ball valve structure, and the seal is formed by the steel ball and the cone surface of the valve seat. The function of the kelly cock valve is to prevent the formation pressure from pushing the mud to be ejected upward along the drill string water hole when the formation pressure exceeds the mud hydrostatic column pressure during the drilling process, so as to protect the hose from being suffocated due to high pressure. The use of the kelly cock valve can not only prevent the mud from spraying out from the water hole of the drilling tool, protect the hose from the damage of the formation high pressure, but also play ...

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