| 摘要 |
PURPOSE:To simplify construction of a valve so as to improve its reliability and reduce its cost, by reciprocally moving a slide valve through a piston, being actuated by two kinds of solenoid valves in high and low pressure sides and having different diameters, so as to select a flow of fluid in normal and reverse directions. CONSTITUTION:At room cooling operation, high pressure gas delivered from a compressor is allowed to flow into a valve structure 1' from an inflow pipe 4' and through a flow pipe 6', being allowed to flow in two kinds of heat exchangers and then becoming low pressure gas, thus the low pressure gas is allowed to flow again into the valve structure 1' from a flow pipe 7' and through a slide valve 2, being sucked to the compressor from an outflow pipe 5'. Here the gas is communicated through solenoid valves 14, 15 respectively in high and low pressure sides to the large bore side of a piston 3 with different diameters interlocking to the slide valve 2. Then for instance, at room heating operation, a pressure is applied to the large bore side of the piston 3 with different diameters so as to move the slide valve 2 leftward against piston force in the small bore side and selece a flow path by closing the low pressure side solenoid valve 14 further opening the high pressure side solenoid valve 15. |
