Air compressor is working, pressure switch two set points in the closed state, the compressed air from the air tank into the switch connector and vent valve, when the reservoir pressure to switch the preset pressure highs, through a cushion of air pressure control switch, pressure lever up, quickly, in under the action of the spring put electric contact parts of the moving contact and the static contact release. Cut off the power supply, the motor will stop working, and the top rod of the vent valve will be pressed down at the same time, so that the compressed air in the pipeline will be discharged through the vent valve, and the starting load of the motor will be reduced.

On the contrary, when the pressure of the gas storage tank drops to the lower limit, the above mentioned components move in reverse to make the circuit connected and the air compressor starts working again.

(note: the control bolt on the top of the switch works when pulling out and stops when pressing down).