| 摘要 |
PROBLEM TO BE SOLVED: To reduce noise by restraining vibration or the like of a secondary joint pipe, by stabilizing a flow of a refrigerant in a valve port, in an electric valve for controlling a flow rate of the refrigerant by opening-closing the valve port by a needle valve.SOLUTION: A first valve port 11 of an inner diameter D1 and a second valve port 12 of an inner diameter D2 are formed in a cross-sectional circular shape in a valve housing 1. D1<D2<D3 is satisfied to an inner diameter D3 of the secondary joint pipe 22. An inner diameter ratio D2/D1 of the inner diameter D2 of the second valve port 12 and the inner diameter D1 of the first valve port 11 satisfies 1.05≤D2/D1≤1.85. A length ratio L2/L1 of the length L2 of the second port 12 and the length L1 of the first port 11 satisfies 20≤L2/L1≤45. A taper part 13 connecting the first valve port 11 and the second valve port 12 is formed, and the taper angle α3 of the taper part 13 satisfies 90°≤α3≤150°. Pressure is not swiftly restored in the second port 12. The flow of refrigerant is straightened in the second port 12. |
