Center line-type butterfly valve

The invention discloses a center line-type butterfly valve, which belongs to the field of valve design, comprises a valve body, a valve plate and a valve shaft, and is characterized in that a sealing belt vulcanization groove is arranged on the inner wall of the valve body corresponding to the sealing position of the valve plate, and a sealing belt is vulcanized in the sealing belt vulcanization groove. The overall rubber coating sealing face of an inner cavity of a valve body of a traditional rubber hanging center line-type butterfly valve is improved, under the condition that sealing is guaranteed, a sealing belt is simpler, the manufacturing process is simpler, and particularly, a new design and a better manufacturing process are provided for valves with large calibers and ultra-large calibers; therefore, the product series of the center line-type butterfly valve is extended, and the application range is expanded. 本发明公开了一种中线蝶阀，属于阀门设计领域，包括阀体和阀板以及阀轴，其特征在于：所述阀体的内壁对应阀板密封位置设有密封带硫化凹槽，所述密封带硫化凹槽内硫化有密封带。本发明通过将传统挂胶中