| 摘要 |
PCT No. PCT/JP97/00499 Sec. 371 Date Jan. 15, 1998 Sec. 102(e) Date Jan. 15, 1998 PCT Filed Feb. 21, 1997 PCT Pub. No. WO97/31206 PCT Pub. Date Aug. 28, 1997A mechanical seal having two balance diameters and balance factors established separately and freely for two fluids which are opposed at a sealing face by providing two seal packings with a seal ring. A sidewall of a packing groove is removed on the sealed fluid side when the sealed fluid contains crystal deposits or solid substances, and a vacuum path is connected between the two seal packings. Also, a seal ring can be divided between the two seal packings into two parts so as to provide flexibility against deflection in a radial direction.
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