| 摘要 |
An apparatus for providing a seamless supply of fluid from a first exhaustible fluid supply and a second fluid supply is described, said apparatus comprising: a switching vessel having at least one first inlet for receiving fluid from the first exhaustible fluid supply and at least one second inlet for receiving fluid from the second fluid supply and at least one fluid outlet; and a regulating mechanism arranged to provide fluid from said first exhaustible supply for output at said at least one fluid outlet whilst said first exhaustible supply is not exhausted, and fluid from said second fluid supply when said first exhaustible fluid supply becomes exhausted; the apparatus being further provided with means arranged such that fluid is retained substantially within said first exhaustible fluid supply and said second fluid supply when fluid is not required from said at least one outlet. A helical float valve arrangement for use with such an apparatus is also described. |
