HiFluid independently developed Hydrogen Cylinder Hydrogen Cycle Test Bench is designed and manufactured in accordance with the standards "GB/T 42612-2023 Fully Wrapped Carbon Fiber Reinforced Composite Cylinders with Plastic Liners for Compressed Hydrogen Storage on Vehicles" and "GB/T 35544-2017 Fully Wrapped Carbon Fiber Reinforced Composite Cylinders with Aluminum Liners for Compressed Hydrogen Storage on Vehicles." It is used for fatigue life testing of hydrogen cylinders under high/low-temperature environments and with hydrogen at varying temperatures. The equipment can also perform gas cycle tests on CNG cylinders or other pressure vessels.

The test bench 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.