In solar thermal power generation, it is necessary to put the heat medium heated by the solar light receiver into the heat exchanger, and exchange heat with the working fluid such as water or air that drives a heat engine such as a turbine. Previously, heat exchange experiments were conducted by directly contacting high-temperature air with a certain amount of alumina particles as a heat storage material. However, continuous heat exchange was not possible due to the batch type heat exchanger. Therefore, it is necessary to develop a heat exchanger that continuously exchanges heat by directly contacting the heat storage particles with the working fluid. For this purpose, a mechanism that allows the heat storage medium to move from the receiver at atmospheric pressure to the heat exchanger at high pressure is required. Since the mechanism uses a poppet valve to discharge heat storage particles, a preliminary experimental device was manufactured to confirm the operation.