| 摘要 |
<p>A liquid pump has a housing (11) with a chamber (19) therein adapted to receive liquid from a liquid source via a first one-way valve (23) which is arranged to allow liquid to pass therethrough into the chamber (19) while preventing return flow of the liquid. The pump also has a liquid outlet (31) with an outlet opening (33) communicating with the chamber. A second one-way valve (35) is provided in or connected to the liquid outlet (31) to allow liquid to pass therethrough out of the chamber (19) while preventing return flow of the liquid. The pump also has an air inlet (25) with an inlet opening (27) communicating with the chamber (19) at a location above the outlet opening (33). The air inlet (25) is adapted for connection to a supply of compressed air. A vent (37) is provided for venting air in the chamber (19). The vent is adapted to be opened and closed by a valve (39), whereby on closing of the vent (37) said compressed air effects expulsion of the liquid in the chamber (19) through the liquid outlet (31).</p> |
