-The cold-rolled steel shell is used, and the surface is treated by electrostatic spraying

-DC motor, quiet, longer service life

-No working medium (no oil), no pollution, providing a clean vacuum environment

-Non friction membrane motion is adopted, which does not generate heat, has no friction loss, and extends the working life

-It is small in size, light in weight, easy to move, saves laboratory space, and is convenient for repair and maintenance.