The additional stroke of the ball valve shall be at least equal to 50% of the rated static deflection; The number of ball valve coils shall not be too small, generally not less than six; The ball valve manufactured in this way can ensure that the horizontal rigidity of the pneumatic butterfly valve is enough so that the equipment is stable and not prone to toppling, the elasticity is durable, and the valve capacity is durable. However, the price of this ball valve pneumatic butterfly valve is often higher. It needs to be pointed out that at present, a ball valve pneumatic butterfly valve is popular in the market, which hides the ball valve inside the shell, The reason why the state of the ball valve cannot be seen directly outside is that it is not correct. If the ball valve is seriously rusted after a period of time, the manager cannot detect and replace it in time, which may lead to the terrible consequences of the ball valve breaking, the water pump sinking, and the pipeline breaking