| 摘要 |
PURPOSE:To enable a valve to instantly full opening/full closing a valve seat by providing two valve seats having a small bore and large bore at the valve seat portion, thereby enabling pressure applied to the valve seat having a large bore to exchange pressures of a supply side and a receive side each other. CONSTITUTION:In the course of a conducting hole 12, the first valve seat 13 and a valve chamber 14 formed by swelling the inner diameter of the conducting hole 12 are located. A cylindrical flow passage 15 is formed in such a way as surrounding the conducting hole 12 on the supply side of the first valve seat 13 from the outside. In the flow passage 15, the release side thereof is intercommunicated with the first valve seat 13 and an annular dam 16 is formed along the periphery of the release side and then the slidable second valve seat 7 is mounted inside the dam 16. The second valve seat 17 is formed in a cylindrical shape and on one end thereof a jar 18 which touches or separates to or from the dam 16 is formed.
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