the butterfly plate of the wafer butterfly valve is installed in the diameter direction of the pipeline, and it mainly plays the role of cutting off and throttling on the pipeline. the opening and closing part of the wafer butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjustment. wafer butterfly valve adopts worm gear reducer, which can not only make the butterfly plate have self-locking ability, make the butterfly plate stop at any position, but also improve the operation performance of s valve. the valve is not only simple in structure, small in size, light in weight, low in material consumption, small in installation size, small in driving torque, easy and fast to operate, but also has good flow regulation and closing and sealing characteristics at the same time. the wafer butterfly valve is connected between two pipe flanges with stud bolts.