A reciprocating compressor is a compressor whose essential part is a piston performing reciprocating reciprocating movement in a cylinder. It belongs to the subgroup of volumetric compressors. As the piston moves in the cylinder, the gas is gradually sucked in, compressed and pushed out. The valves that let the gas into and out of the cylinder work automatically, based on the pressure difference. They are smaller and cheaper than screw compressors, they are suitable for home and craft work or small and medium-sized businesses.