| 摘要 |
PROBLEM TO BE SOLVED: To effectively suppress a hunting phenomenon even in when the differential pressure between the front and rear of a check valve is small.SOLUTION: This check valve 1 includes: a cylindrical body 10 having an introduction port 23 of a refrigerant on an upstream side and a lead-out hole 24 of the refrigerant on a side part; a valve seat 22 provided between the introduction port 23 in the body 10 and the lead-out hole 24; and a valve element 12 having an attachment/detachment part 32 slidably stored in the body 10 and attached and detached to and from the valve seat 22 in order to open and close a first valve part, and a sliding part opening and closing a second valve part having an effective pressure receiving diameter larger than the first valve part depending on a slidable contact position with an inner peripheral surface of the body 10, and opening and closing the lead-out hole 24. When the length of the sliding part on the first valve part side compared to the lead-out hole 24 in the valve close state of the first valve part is L, the effective pressure receiving diameter of the first valve part is a, an inside diameter of the body is b, and an outside diameter of the sliding part is c, the following relationship is satisfied; L≥4b(b-c)/a. |
