| 摘要 |
<p>PCT No. PCT/SE98/00972 Sec. 371 Date Nov. 29, 1999 Sec. 102(e) Date Nov. 29, 1999 PCT Filed May 22, 1998 PCT Pub. No. WO98/53670 PCT Pub. Date Dec. 3, 1998A pulsator comprises a first circuit having a first outlet (2) and a second outlet (3), connected alternatively to a first pressure level and a second pressure level, respectively. Furthermore, the pulsator comprises a second circuit, which comprises a first inlet (17a, 17b) connected to the first pressure level, a second inlet (18a, 18b) connected to the second pressure level, and valve members (19a, 19b) for its adjustment by a short connection of a control inlet (26a, 26b) of the valve members to the second pressure level between a first stable position at which the first inlet is connected to a first chamber (10) at the same time as the second inlet is connected to a second chamber (11) or a second stable position at which the first inlet (17b) is connected to the second chamber (11) at the same time as the second inlet (18a) is connected to the first chamber (10).</p> |
