| 摘要 |
A pump device comprises a supply tube (1) for a liquid with a relatively low head, an accumulator (3) connected to the same via a non-return valve (2), an outlet tube (4) from the accumulator for liquid with a relatively high head, and an outlet valve, provided at the supply tube (1) after the accumulator. The outlet valve opens and shuts an outlet at the supply tube (1). The outlet valve comprises a damper (6) movable between a position, in which the opening is left open, and a position, in which the opening is closed.
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