| 摘要 |
PROBLEM TO BE SOLVED: To prevent a valve body member from being separated from a valve rod and deforming, in a pressure reduction valve.SOLUTION: To a large diameter part 82, an umbrella part 84 and an equal diameter part 86 of a valve rod 80, a valve body 68 is externally fitted as a valve body member. Between the valve rod 80 and the valve body 68, a seal ring 90 is interposed. Further, between the umbrella part 84 and the equal diameter part 86, a relief groove 88 is formed. The relief groove 88 communicates the space between the rod 80 and the valve body 68 with a valve hole 72 without depending on whether the valve body 68 is seated or separated with respect to a valve seat 74. Consequently, when fluid enters between the valve rod 80 and the valve body 68, the fluid is discharged to the valve hole 72 from the relief groove 88 without depending on whether the valve body 68 is seated or separated with respect to the valve seat 74. |
