As mechanical type vacuum pump equipped with a pair of varying pitch screws in pump housing, LG series screw vacuum pump can realize the gas intake and exhaust by the synchronous rotation of the two screws in high speed.

The two dynamic balanced screws are supported by bearings and installed within pump chamber. There are clearances between the two screws and the pump housing, so the pump operation can be smooth and with a low noise and free of lubricant in the pump chamber. The dry screw pump can be used to pump the gases that contain a mass of vapor and a small quantity of particles. The screw pump with varying pitch structure has lower ultimate pressure and power consumption compare with that of constant pitch structure. Generally the pump has the advantages in energy conservation and easy maintenances, and it is the updated vacuum pump replacing an oil seal vacuum pump.