Low-torque high-temperature high-pressure bidirectional three-eccentric center butterfly valve

The invention provides a low-torque high-temperature high-pressure two-way three-eccentric center butterfly valve which can achieve two-way sealing, is small in torque, not prone to being stuck and long in service life. The invention relates to a reverse flow check valve, which comprises a valve rod and a valve plate, two ends of the valve rod are respectively arranged on a valve body through a bearing support structure, a valve seat is sleeved on the valve body on one side of reverse flow, and a sealing ring structure is arranged between the valve plate and the valve seat, and is characterized in that the sealing ring structure comprises a sealing ring, the sealing ring is arranged on the valve plate, and the sealing ring is arranged on the valve plate. A bearing of the bearing supporting structure extends into the valve body to reach or exceed the position of a sealing line between the sealing ring and the valve seat, and the distance between the position of the supporting tail end of the bearing and the se