This equipment system is a supply system specially designed for the supply of dangerous gases such as flammable, explosive, corrosive, and toxic. Its basic functions include automatic purging, automatic switching, and automatic safety cut-off in emergency situations (when the set alarm signal is when triggered). The equipment uses a touch screen as the human-machine interface, detects system-related pressure, weight, flow and other signals through PLC, and then drives the pneumatic valve through the solenoid valve to open and close the valve to achieve a safe supply of gas. The program includes various safety protection chains and alarms and a variety of purging procedures to achieve equipment safety, continuous operation and safety protection of personnel and equipment. The system is equipped with operation passwords and recording operation alarms to achieve full recording of the process.