| 摘要 |
PCT No. PCT/GB86/00491 Sec. 371 Date Apr. 30, 1987 Sec. 102(e) Date Apr. 30, 1987 PCT Filed Aug. 18, 1986 PCT Pub. No. WO87/01170 PCT Pub. Date Feb. 26, 1987.A face seal has a sealing ring (7) with a frusto-conical margin (12) diverging from the plane of the contact band (8), so as to define a sealing region (13) which enlarges toward the sealed side "S," and a peripheral shoulder (14) which has a non-constant axial clearance from the counter-face to produce liquid pulsation which slightly reciprocates the sealing ring to effect, by displacement pumping, positive action toward the sealed side.
|
