To obtain a restricting device and a flow control device which enable setting of a different amount of restriction for a refrigerant flow in normal and reverse directions and to obtain air conditioning equipment which can conduct heating, reheating and dehumidifying operations and can reduce the sound of the refrigerant flow.
A communicating flow passage 16a making first and second flow passages 9a and 9b communicate with each other are provided, while a restricting flow passage 16b is provided in parallel to the passage 16a, and first and second restricting parts 13 and 15 are connected to the restricting passage 16b. The passages 16a and 16b are switched over by a switchover means 8 and a flow to the second restricting part 15 is switched over by a check valve 14. A fluid is subjected to pressure reduction by the first restricting part when it flows in the direction A through the restricting passage 16b, and subjected thereto by the second restricting part 15 or by the second restricting part 15 and the first restricting part when it flows in the direction B, so that the amount of restriction is different according to the flowing direction of the fluid. Besides, a porous permeable material is disposed in the restricting flow passage 16b so as to reduce a noise.
HIRAKUNI SATORU
SUMIDA YOSHIHIRO
