Low-flow-resistance self-compensating high-temperature-resistant butterfly valve

The invention relates to a low-flow-resistance self-compensating high-temperature-resistant butterfly valve which comprises a main valve body, a side valve body, a valve rod, a butterfly plate and a high-temperature-resistant combined butterfly valve sealing ring, and the butterfly plate is arranged in the main valve body and the side valve body and connected with the valve rod; the main valve body, the side valve body and the butterfly plate are sealed by adopting a high-temperature-resistant combined butterfly valve sealing ring; the valve rod is of a low-flow-resistance design structure, and a traditional integrated valve rod is changed into an up-down split structure, so that the shielding face when a medium passes through is reduced. Compared with an original rubber sealing ring, the novel structure of the high-temperature-resistant combined butterfly valve sealing ring has the advantages of being low in friction coefficient, excellent in abrasion resistance, good in corrosion resistance, high in bearing