| 摘要 |
<p>PCT No. PCT/FR96/00674 Sec. 371 Date Feb. 13, 1998 Sec. 102(e) Date Feb. 13, 1998 PCT Filed May 3, 1996 PCT Pub. No. WO96/35055 PCT Pub. Date Nov. 7, 1996A vertically reciprocating pump is described, characterized by a piston which has a support including a hub extending downwards and supporting reinforcement legs, the hub having a rod to which it is translatably coupled passing therethrough, and by a valve overlying the support, which seals the piston under the weight of the column of liquid above it or allows the passage of liquid when the piston moves down the water column in the drainage pipe.</p> |
