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