| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow rate control valve reducing as much as possible noise (refrigerant passing noise) generated by a refrigerant passing through a groove as a refrigerant delivering throttle portion. SOLUTION: This flow rate control valve includes: a valve seat member 14 having a valve seat portion 14A formed with an inverted conical tapered surface 14a; and a valve rod 20 having a valve element portion 21A formed with an inverted conical tapered surface 21a approaching and separated with respect to the valve seat portion 14A. The valve seat portion 14A is provided with a bleed groove 17 of a predetermined depth in order to throttle and deliver the refrigerant even during a valve closing period when the valve element portion 21A abuts on the valve seat portion 14A. An angleαobtained by subtracting the center angleθb of the tapered surface 21a of the valve element portion 21A from the center angleθa of the tapered surface 14a of the valve seat portion 14A is 0°to 2.5°. COPYRIGHT: (C)2009,JPO&INPIT
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