The compressor is responsible for the production of compressed air and generally consists of a mechanical reciprocating compressor coupled to the combustion engine. Pressure Regulator (2)
A pressure regulator follows the compressor. The regulator is nothing but an automatic switching valve which controls the operating pressure in the air-brake circuit. If the operating pressure set by a spring is achieved (approx. 8-10 bar), the air is blown off through a separate connection. The steadily-running compressor then only works against atmospheric pressure.