CNG Storage Cascade Stores CNG at different pressures in groups. After high pressure vaporization, water bath vaporizer, CNG into the priority panel, through automatic distribution, stored in three groups of high, medium and low pressure CNG cylinders. When the distributor refuels the vehicle, the system automatically controls three groups of CNG cylinders to supply gas to the distributor. The process has a high degree of automation, realizing one-click filling, reducing the start-up frequency of the high-pressure pump and reducing the probability of failure.