| 摘要 |
<p>PCT No. PCT/EP95/02115 Sec. 371 Date Feb. 7, 1996 Sec. 102(e) Date Feb. 7, 1996 PCT Filed Jun. 3, 1995 PCT Pub. No. WO95/34776 PCT Pub. Date Dec. 21, 1995The invention concerns a back-flow check valve having a flat valve seat with a plurality of openings which are covered by a head of a mushroom-shaped closing member manufactured of a soft-elastic material. A fine mesh sieve is arranged between the head of the closing member and the valve seat for covering the openings. The fine mesh sieve prevents the head from being partially pulled into the openings so that knobs would be formed on an interior surface of the head.</p> |
