Ethylene oxide sterilization cabinet door seal pressure constant system with alarm device

The invention discloses an ethylene oxide sterilization cabinet door seal pressure constant system with an alarm device. The ethylene oxide sterilization cabinet door seal pressure constant system with the alarm device is characterized in that pneumatic ball valves comprise a first pneumatic ball valve and a second pneumatic ball valve, the first pneumatic ball valve and the second pneumatic ballvalve are connected with the signal output end of a PLC through RS232 buses, the first pneumatic ball valve communicates with an air inlet pipe, and the first pneumatic ball valve communicates with anair cylinder; the air cylinder communicates with a door seal inflation sealing gasket, and the air cylinder communicates with the second pneumatic ball valve and is discharged through the second pneumatic ball valve; and a digital pressure gauge communicating with the interior of the air cylinder is arranged outside the air cylinder, the digital pressure gauge is connected with a pressure gauge signal end of the PLC throu