| 摘要 |
A movable bellows (14) is fitted in ther inner chamber (13) of a fixed housing (10). One end is connected to one wall (11) of the housing and the free end is connected liquid tight to a base (15). Two pipe lines (18,21) are respectively connected to the two chambers (13,16) so formed, as well as respectively to two outlets (22,23) for the liquid. They are connected across two, three way valves (25) to give two positions so that in each switching position respectively the supply of one chamber is connected to the input line and the discharge of the other chamber is connected to the outlet line. The bellows is fitted at the top wall of the housing suspended so that it can move in a vertical direction. Both chambers are designed with conically tapered bases.
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