| 摘要 |
PROBLEM TO BE SOLVED: To reduce abrasion by reducing sliding between a lower end of an outer circumference of a disc-shaped valve element and a lower end of a circumferential wall in a valve casing. SOLUTION: In this check valve, an inlet 2, an annular valve seat 3, and an outlet 4 are coaxial formed in a valve casing 1. On an inner circumferential wall of the valve casing 1, four ribs 5 are provided, and spaces for fluid to pass are formed between the ribs 5. Inner surfaces of the ribs 5 are all positioned concentrically, and formed at a constant distance from an axial center of the inlet 2 and outlet 4. A disc-shaped valve element 6 is disposed on the outlet 4 side of the annular valve seat 3. The diameter of the disc-shaped valve element 6 is a little smaller than that of the inner surface of the rib 5, and its outer circumference loosely gets in contact with the inner surface of the rib 5 to slide. An outer circumference of a spring bracket 7 is disposed to be engaged in a groove in the rib 5. The spring bracket 7 is inclined to be disposed so that the lower side of it is closer to the disc-shaped valve element 6, and that a distance to the disc-shaped valve element 6 is narrower on the lower side. A coil spring 8 to energize the disc-shaped valve element 6 to the annular valve seat 3 is disposed between the disc-shaped valve element 6 and the spring bracket 7 formed narrower on the lower side, more compressed on the lower side.
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