Piston type vacuum pumps and compressors are being used where oil-free air is a must. The oil free character of the pump is definitely a guaranty of low maintenance costs. The pumps can be found in capacities of maximum 6 m3/hr plus they are able to reach a vacuum of 10 mbar(a). 
Used as a compressor they reach a pressure of approx. 7 bar(g) maximum.
These pumps are getting used for light commercial functions, medical industry, printing and device industry, plastic, meals and packaging, electronic, chemical Piston Vacuum Pump china substance and textile industry.