Air Pressure Regulator can regulate inlet air pressure of the Air-Operated Double Diaphragm Pump, and maintain the stability of inlet air pressure supply. The pressure of regular air compressor can reach up to 8.3 bar, which might cause damage to the parts of AODD pump in the long run. With the air pressure regulator installed on the AODD pump, not only can it achieve energy efficiency, the service life of Air-Operated Double Diaphragm Pump can be extended by controlling the air pressure at an appropriate level through the air pressure regulator.