Based on solenoid valve design theory, by estimating the maximum air pressure and spring force, a direct operated solenoid valve is designed to control the open and close of the air chamber.

This text still abandons the thought that control through the end pressure and put forward a new control method that can consider all factors of the system and direct control the valve.

The factory direct sale compressor meets the skull, to import the expansion valve, to control, various vehicles is warm the original installation pressure transmitter and so on!