Screw Vacuum Pump: A rotary screw pump is one of the earliest designed constructive displacement pumps which was known as the Archimedes‘ screw. In its easiest form, this pump is made up of one screw inside of a hollow cylinder. Modern-day designs incorporate double or triple screws meshing from one https://nngmi32086.ageeksblog.com/26433156/about-air-compressors