QiLing" spraying pump ,type SB750, it use kinetic energy between water and vapor to pump gas, and make the equipment turn vacuum. It is used widely in chemical, medical, and light industry and so on. Its construction is easy and it can be operated quickly. It cost you about 1/4 of the cost of W4 vacuum pump. It does not need condenser, can save steel, It is easy to maintain, and to check. It can deal with something in the eroding gas condition. It does not need a special