(2) It has certain damping characteristics; (3) Be able to withstand the change of temperature and other environmental conditions (temperature, corrosive fluid, etc.); (4) Be able to bear the specified load; (5) It can provide the required amount of vibration reduction; This paper briefly introduces the working principle of the electric butterfly valve. In order to improve the ride comfort of the car, the electric butterfly valve is installed in parallel with the elastic element in the suspension. In order to slow down the valve movement, the electric butterfly valve used in the car suspension system is mostly hydraulic electric butterfly valve. Its working principle is that when the frame (or body) and axle vibrate and there is relative movement, The piston in the electric butterfly valve moves up and down, and the oil in the electric butterfly valve cavity flows from one cavity to another repeatedly through different pores