New Vacuum Pump Idea
I have a new idea about a new type of positive displacement vacuum pump. Its of the piston variety, but instead of a one way valve which doesn't work when the pressure gets low enough, another piston is used to act as a valve switching between the vessel to be evacuated (when the main piston is pulling a vaccum) and the atmosphere (when the piston pushes the air evacuated out).
This solves the one way valve problem. Could this pull a much lower vacuum? I need a fairly strong vacuum, but I don't want to have to build/buy a turbomolecular pump.
Also, i have a metal lathe, that's why i'm going with the piston variety.