| 摘要 |
The invention relates to a control arrangement (10) for a shutoff valve, actuated by application of negative pressure, for use in a negative pressure wastewater system. The control arrangement includes a chamber (28) in which a main piston (22) is displaced as a function of negative pressure and a driver by way of which valves (70, 72) are actuated so as to operate independently of each other; the valves (70, 72) transmit or inhibit negative pressure to open or close a wastewater aspiration valve and a ventilation valve.
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