HiFluid independently developed Hydrogen Cylinder Hydrogen Cycle Test System in accordance with the standards "GB/T42612-2023" and "GB/T35544-2017". These two standards specifically for fully wrapped carbon fiber reinforced composite cylinders with plastic liners and aluminum liners, respectively, for compressed hydrogen storage on vehicles. The test system is used for fatigue life testing of hydrogen cylinders under high/low-temperature environments and with hydrogen at varying temperatures. It can also perform gas cycle tests on CNG cylinders or other pressure vessels.

The test system uses a hydrogen tube trailer as the gas source. The gas is first transferred to the medium-pressure storage tank via an unloading station. When the pressure in the tube trailer becomes too low, the system switches to the low-pressure storage tank for gas supply. The gas is then pressurized into the medium-pressure storage tank using a recovery compressor.

The high-pressure compressor unit takes gas from the medium-pressure storage tank and further compresses it into the high-pressure hydrogen storage vessel. The gas from the high-pressure vessel is then supplied to the test cylinder through a proportional valve, with the mass flow meter monitoring the gas flow rate. The proportional valve and flow meter operate in a closed-loop control system to adjust the filling rate in real time.

During cylinder deflation, the gas flows through the proportional valve and flow meter into the low-pressure storage tank, with the flow meter ensuring the deflation rate does not exceed the EFV (Excess Flow Valve) limit. The gas in the low-pressure storage tank is then repressurized into the medium-pressure vertical storage tank via the recovery compressor, serving as the gas source for the high-pressure compressor to enable cyclic testing.