| 摘要 |
A pump for raising liquids through a height exceeding the barometric height has adjacent to an outlet of the pump a pumping chamber whereof one end is defined by a reciprocable center portion and a rubber annulus which is in non-sliding engagement with the center portion and with a peripheral wall of the chamber. Openings in the center portion are normally closed by a flap valve. The valve is held closed whenever the center portion is being moved in a direction to reduce the volume of the pumping chamber. Adjacent to an inlet to the pump, there is a chamber having a wall portion formed by an elastomeric sleeve which can store potential energy. Contraction of the sleeve is limited by a perforate metal support.
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