Fourthly, after the pneumatic butterfly valve is installed, the threads of the connecting parts should be tightened according to the specified torque requirements of the whole vehicle to ensure that the connecting parts are tightened reliably. After no looseness is found, the fastening parts should also be coated with anti rust paint. How to select a pneumatic butterfly valve with a damping ball valve at an appropriate price? 1. Load range of pneumatic butterfly valve of ball valve: equipment operating weight M * 130%/installed quantity of pneumatic butterfly valve N=load range of pneumatic butterfly valve of ball valve; For example, the operating weight of the fan is 1 ton; Four ball valve pneumatic butterfly valves shall be installed for a single fan; What is the load of a single ball valve pneumatic butterfly valve? According to the formula: 1000kg * 130%/4=325kg, check the specifications and parameters of the ball valve pneumatic butterfly valve manufacturer to find the specifications of the ball valve pneumatic butterfly valve suitable for the fan