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 most straightforward variety, this pump includes only one screw inside a hollow cylinder. Modern day designs integrate double or triple screws meshing from each other. https://admission-bhopal-school46922.post-blogs.com/48248146/an-unbiased-view-of-air-compressors