Active Charge Accumulator (ACA) is a new pressure convert technology which does not require any pressure control valve. ACA can be easily reduce or boost the pressure in water hydraulic system by using a multistage piston and on-off valves. This paper was focused on the basic characteristic of ACA especially for decompression process. The both of experimental approach and theoretical one were conducted. As the experimental results, it is revealed that the piston stroke of ACA strongly depends on the output flow rate and switching timing of the on-off valves. Analytical model of ACA was made and validated. As a result, it can be revealed influence of parameters on characteristics of ACA. The pressure change in the system was well estimated by the model.

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