Functions 1. Graded automatic filling: when gas cylinders (tanks) are used for gas supply, the system automatically selects high, medium, and low pressure to take gas according to the pressure in the container. 2. Direct charging of tube bundle truck: when the pressure of the tube bundle truck is much higher than the pressure of the filled gas cylinder, the tube bundle truck can be preferentially used to fill the gas cylinder. 3. Storage: when the pressure of the gas storage facility is lower than the set value, the gas cylinder (tank) will be replenished automatically.