Machines or mechanical apparatus for separating gases, in particular for separating air gases, in particular for the generation of gaseous oxygen; gas separators on an adsorptive basis with adapted pressure guide; pressure regulators or safety valves for gas separators of all kinds, in particular valves, particularly butterfly valves, safety valves, relief valves, check valves; pressure boosters for gas separators of the aforesaid kind, in particular compressors or compactors, in particular for air or oxygen; pressure reducers for gas separators of the aforesaid kind, in particular valves or pumps [machines]; parts of aforesaid machines and apparatus