| 摘要 |
Valve arrangements for suction tubes, characterized by at least two pistons which are mutually mechanically connected and so designed that the one piston always is subject to pressure variations in the one end of the suction tube and the other piston always is subject to pressure variations in the other end of the suction tube. An underpressure in either one of the tube parts results in the effective piston surface which is exposed to the underpressure causing the valve to open.
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