Machines and mechanical apparatus for gas preparation, in particular those which work on the basis of liquefied gases/starting media and which are suitable for supplying higher pressures or special gas mixtures; gas compressors, pumps and pressure intensifiers with corresponding framework for increasing the pressure of process gases; pumps, dosing pumps and pressure intensifiers, liquid gas feed pumps and liquid gas pressure boosters; pressure regulators for pressurised gas apparatus; expansion devices for gases, control valves and expansion valves, being parts of pressurised gas systems and gas supply systems, in particular those suitable for use in the production of plastic parts and in the production of plastics; machines and machine tools for the production of plastic parts and for the production of plastics, and fittings therefor, in particular structural gas technology components; machines for deburring, crushing and separating plastic and rubber parts.