4、 The electric on-off butterfly valve has great flow capacity and excellent sealing performance, so there will be no leakage. This type of valve can instantly achieve the sealing effect, so that the service life of the electric butterfly valve can be maximized, and there will be no strike after a short period of time. In addition, what other attractions does it have? 　　

As the piston moves through air compression, it is well known that the fluid resistance is very small. At this time, the resistance coefficient is equal to that of pipes of the same length.