Pilot middle cavity balance pressure-type ultrahigh pressure ball valve for oil and gas production equipment

Abstract

The invention relates to a pilot middle cavity balance pressure-type ultrahigh pressure ball valve for oil and gas production equipment. The pilot middle cavity balance pressure-type ultrahigh pressure ball valve comprises a main valve body, a first sealing valve seat, a second sealing valve seat and a pressure relief structure, wherein an auxiliary valve body is arranged at one side of the main valve body; a mounting cavity is formed in the main valve body; a valve ball is rotationally connected to the interior of the mounting cavity; a flow guide channel is formed in the middle of the valve ball; the first sealing valve seat and the second sealing valve seat are movably connected to the main valve body and oppositely arranged at two sides of the valve ball; and the pressure relief structure is arranged on the valve ball and is used for guiding a high-pressure medium to the mounting cavity to form a pressure balance state after the valve ball rotates to be opened at a preset angle. Due to the arrangement of the pressure relief structure, when the valve ball is rotated until the pressure relief structure corresponds to the flow guide channel, the high-pressure medium firstly enters the pressure relief structure to communicate with the mounting cavity, and at the moment, the pressure between the mounting cavity and the auxiliary valve body is balanced, so that quick opening and quick pressure relief are realized, the opening torque is reduced, the pressure relief stroke is shortened, damage to the sealing surface in the opening process is reduced, and the service life of the ball valve is prolonged.

Description

technical field

[0001] The invention relates to the technical field of valves, in particular to a pilot middle-cavity pressure-balanced ultra-high pressure ball valve for oil and gas exploitation equipment. Background technique

[0002] The valve is a control component in the pipeline fluid conveying system, which is used to change the passage section and the flow direction of the medium, and has the functions of diversion, cut-off, throttling, check, diversion or overflow and pressure relief. Ball valve is one of the most widely used valves. Its opening and closing part is a valve ball. The valve ball is driven by the valve stem and rotates around the axis of the valve stem to realize the opening and closing action. In the field of high-pressure equipment, the valve ball will be subjected to the high pressure generated by the fluid. The pressure bearing capacity of the existing ball valve is generally below 70MPa. The design ratio of the ball will cause the opening stroke ...

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