| 摘要 |
PURPOSE:To completely close a valve even if a valve seat is somewhat displaced, simplify the centering of the valve seat, simplify the assembly after disassembly, and assemble with no leakage by closing the valve seat with a ball held in an idle condition. CONSTITUTION:An annular rubber-like elastic body 11 is inserted inside the upper end of a through port 1 so that a valve seat gets in close contact with a ball 6 more airtightly. A ball holder 7 holds the ball 6 directly above the through port 1 so that the ball 6 can block the through port 1 of the valve seat 2. The ball 6 held by the ball holder 7 is held so that it can be somewhat moved up and down and to the left and right in the figure, i.e., in a slightly idle condition. Therefore, the inner diameter of the ball holder 7 is formed larger than the diameter of the ball by about 0.5-3mm., for example. |
