| 摘要 |
In the check valve having a valve seat member and the valve member, the valve seat member is provided with first and second conical seats. The second conical seat is positioned upstream the first conical seat. An angle of the second conical seat to an axis of the valve member is more acute than that of the first conical seat. Since the check valve has the second conical seat, contact pressure applied to the first conical seat is uniformly dispersed and, thus, the first conical seat is less worn out. Further, the second conical seat prevents the valve member from cutting into and sticking to the valve seat member, even if the wear has been progressed. Accordingly, an operation of the check valve is stable for a longer period of time.
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