| 摘要 |
PURPOSE:To improve the open/close function and durability of a valve by constructing the packing capable of partitioning a valve to provide a fluid passage without any contact part and provided with sealing function of the valve as well as the valve open/close function. CONSTITUTION:A packing 11 for a fluid changeover valve partitions a valve to provide a fluid passage (b) without any contact part on the outside of said fluid passage by means of valve members, i.e., a hole 16 wall, seal lips 11b, 11b on both ends of said packing, and a flexible cylindrical part 11a, and is provided with valve open/close function that halves and closes a fluid passage (b) while enlarging an outside projection 11c by the expansion of an inside projection 11d isolated from a fluid within a valve, together with sufficient seal function by the seal lips 11b. |
