| 摘要 |
<p>A flow control device adapted to be located in a vessel to control the level of a liquid therein is provided, comprising: a housing defining at least a primary chamber open towards a base portion to effect fluid communication in use with liquid in the said vessel and having a liquid supply aperture through an upper portion of the housing and a one way valve aperture letting into an upper portion of the chamber to allow the egress of air from the chamber but to restrict return flow; a float located within the primary chamber such as to rise and fall therein in use at least between a higher or up position and a lower or down position having a through bore therein for flow of liquid; a fluid conduit fluidly communicating between the liquid supply aperture and the through bore in the float so that the said liquid supply aperture, fluid conduit and through bore together constitute a fluid supply path within the chamber from outside and through the upper portion of the housing towards the base portion (and hence to the said vessel in use); wherein the fluid conduit comprises a flexible tube so configured as to describe an extended state with a substantially open through bore when the float is in the down position and to describe a kinked state with a substantially occluded through bore when the float is in the up position; and wherein the housing includes a lower apertured portion providing fluid communication into the primary chamber, the lower apertured portion opening externally approximate with but extending above a base level of the housing.</p> |
