| 摘要 |
<p>A changeover valve has a valve body formed on a valve rod in such a manner as to be detached from forming molds and easily and securely mounted on a projection formed on the valve rod. The valve body is bisected at the center of the projection on the valve rod and has a mechanism for effectively preventing the downward penetration of compressed air from the edge of the bisected segment. The changeover valve has a valve rod carrying a valve body that switches the flow of fluid between individual ports by coming in and out of contact with two opposite valve seats. The valve rod has an annular projection on which the valve body of elastic substance is to be fitted. While a first annular groove is provided on each side of the annular projection, a second annular groove is cut at the center of the annular projection. The valve body is bisected into two segments that are individually mounted on both sides of the second groove. Each valve body segment has an integrally formed first and a second fitting projection adpated to fit in the first groove and the common second groove. The second fitting projection on the bisected valve body segment has an annular flange extending inward toward the valve rod. The flange has a bore whose diameter is reduced to a minimum within such a limit as will not interfere with the detachment of forming molds.</p> |
