A screw vacuum pump is a gas extraction device that utilizes a pair of screws rotating synchronously at high speed in opposite directions within the pump casing to achieve suction and exhaust. It is an upgraded product of oil-sealed vacuum pumps, capable of extracting gases containing large amounts of water vapor and small amounts of dust. It is widely used in domestic industries such as pharmaceuticals, chemicals, and semiconductors, where high cleanliness vacuum requirements are critical.

      The Roots screw vacuum unit is composed of a Roots pump as the main pump and a screw pump as the fore pump connected in series, which enhances the ultimate vacuum and pumping speed.