| 摘要 |
PROBLEM TO BE SOLVED: To provide a check valve less producing impact noise between the inner wall surface of a casing and a valve element even when a fluid velocity fluctuates (including such a case that a fluid flows intermittently). SOLUTION: In this check valve K, a valve element 2 is stored in the casing 1 having a valve seat 10 formed on the circular inner wall surface thereof movably in the valve axial direction and a valve element stopper 3 is fixedly disposed on the downstream side of the valve element 2, and a compression coiled spring 4 is interposed between the valve element 2 and the valve element stopper 3. The valve element 2 comprises a plurality of grooved fluid invading passages 20 extending from the upstream side to the downstream side in the outer peripheral surface at equal angular intervals. The fluid flows to the downstream side through mainly the fluid invading passages 20. The overall flow passage area of the fluid invading passages 20 is set smaller than the flow passage area on the upstream side. COPYRIGHT: (C)2006,JPO&NCIPI
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