| 摘要 |
A pump apparatus for use with a vessel to selectively expel fluid from the vessel, the apparatus comprising a housing with an internal chamber having first and second portions, the first portion includes an inlet port and an outlet port that communicates with the outside of the vessel; a conduit connected to the inlet port and in fluid communication with the inside of the vessel; a stopper mounted within the first portion and being movable to seal and unseal the outlet port for regulating the expulsion of fluid from the chamber; a reciprocating member moveably mounted within the second portion and being dimensioned for a close fit therein, and further being connected to the stopper and having a larger exposed surface area than the stopper, such that the reciprocating member moves in a first direction in response to an increase in fluid pressure in the first portion causing the stopper to unseal the outlet port, and moves in an opposite second direction when the fluid pressure in the first portion returns to that of the resting state of the apparatus, thereby enabling the stopper to seal the outlet port; and a means for selectively increasing the fluid pressure in the first portion of the chamber to actuate the reciprocating member.
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