| 摘要 |
<p>Fluid flow apparatus comprising a housing defining a chamber, a chamber inlet and a chamber outlet for the flow of liquid therethrough, a level sensor providing a control signal having a magnitude related to the level of liquid in the chamber, and a valve hydraulically connected to control flow into the inlet or out of the outlet, and controller operably connected to alternately open and close the valve in a duty cycle responsive to the magnitude of the signal.</p> |
