Oxygen generator incorporated with oxygen high pressure compressor for filling cylinders creates a system called Oxygen generating and filling station. System consists of essentials such as air compressor, dryer, filtration etc. and standard features including molecular sieve protection, stainless steel piping and many more. Oxygen filling plant can be enhanced with optional features to make the operation more comfortable for the end-user, for instance remote control, flow meter and flow control valve or energy saving valve, etc.