| 摘要 |
<p>PCT No. PCT/SE96/01441 Sec. 371 Date May 6, 1998 Sec. 102(e) Date May 6, 1998 PCT Filed Nov. 8, 1996 PCT Pub. No. WO97/17558 PCT Pub. Date May 15, 1997A valve housing of a diaphragm valve has a first valve chamber, into which open a central channel and first and second channels. Valve seats are arranged in the housing, and a first diaphragm is adapted to seal against at least one of the first and second valve seats. A second valve chamber, into which opens a fourth channel, communicates with the central channel through an opening in the housing. A third valve seat is provided and a second diaphragm is adapted to seal the third valve seat.</p> |
