| 摘要 |
PROBLEM TO BE SOLVED: To provide a check valve capable of reducing a pressure loss. SOLUTION: This check valve is provided with the first closing part 6 constituted of a valve seat element 2 with a flow hole 4, and an elastic valve element 3 attached to the valve seat element 2, of which the valve element 3 closes the flow hole 4, and an acceleration part 7 for accelerating enlargement of an opening degree of the first closing part 6 in response to pressure of a fluid.
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