| 摘要 |
<p>Liquid recovery apparatus comprises first and second liquid holding vessels (110, 112), a vacuum pump (156) adapted to apply a vacuum selectively to one or other of the vessels and control means (140) adapted to switch the vacuum from one vessel to the other when the liquid level in the one vessel reaches a maximum level, the liquid contained in the one vessel being discharged therefrom while liquid continues to be collected in the other vessel. The apparatus operates in a cyclic manner to continuously recover liquid into the vessels alternately. The liquid level is monitored by uppermost float valves (134, 136). Liquid discharge is facilitated by pressurising the vessel after the liquid reaches the uppermost level, the pressure being removed when the liquid falls to a lowermost level detected by lowermost level detectors (176, 178). The apparatus is pneumatically powered and controlled, and utilises a venturi type vacuum pump.</p> |
