| 摘要 |
PURPOSE:To reduce resistance loss for fluid by thickening a valve rod while providing a recess in the center of the lower surface of a valve body on the lower end of valve rod. CONSTITUTION:The outer diameters of a valve rod 5 and valve body 5b of a synthetic resin valve rod tip fixed to the lower end of valve rod are enlarged as large as possible and a large recess 25 is provided in the center of the lower surface of said valve body 5b. Thus, in opening a valve, the flow path area of fluid passing through a gap between a valve seat 2a on the bottom in a valve chamber 2 of a valve box 1 and the valve body 5b of lifter valve rod 5 is equalized to or made larger than the path area of a fluid throttled, but sufficient flow is obtained, so that the resistance loss for the fluid is reduced.
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