Pneumatic bellows type hydraulic sealing ball valve

The invention discloses a pneumatic bellows type hydraulic sealing ball valve, belongs to creations in a special valve aspect in the coal chemical industry field, and aims at providing a novel valve for solving the problems that a lock hopper valve, a lock slag value and a silicon powder valve, which are used on an existing device on a production line, are unstable in running, short in service life and the like. According to the provided novel valve, a left bellows valve and a right bellows valve are respectively arranged on two sides of a middle valve, two sets of bellows type hydraulic sealing valve seats are respectively arranged in the left bellows valve and the right bellows valve, and the valve seats are designed as movable contact spherical faces, and are sealed under hydraulic control. When a ball core rotates, seal rings on the valve seats cannot be contacted with the spherical faces, and only when the valve is closed, the seal rings on the valve seats and the spherical faces can be contacted, and th