SUPERCOOLING DEGREE CONTROL TYPE EXPANSION VALVE

摘要

PROBLEM TO BE SOLVED: To obtain a supercooling degree control type expansion valve for use in refrigeration cycle in which generation of noise is prevented by urging a valve disc for opening/closing a refrigerant channel in a direction inclining against the axial direction through an urging means thereby suppressing the vibration of the valve disc due to refrigerant flow. SOLUTION: A supercooling degree control type expansion valve 10 placed in a pipe line for passing high pressure refrigerant is closed when a valve disc 14 is pushed against a valve seat 13 formed in a tubular case 12. The valve disc 14 comprises three guide legs 14c, and three supporting leg pieces 14d extending along the inner circumferential surface of a downstream side channel 16b and the valve disc 14 is positioned oppositely to the valve seat 13 while being urged by a compression coil spring 18 from the downstream side. The compression coil spring 18 has no end turn at either end and the valve disc 14 is prevented from being vibrated due to refrigerant flow by urging the valve disc with spring force in the direction inclining against the axial direction thereby pushing the valve disc 14 against the inner circumferential surface of a refrigerant channel 16.