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

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