| 摘要 |
The invention relates to a valve, in particular, a proportional seat valve or gate valve, comprising a valve housing ( 10 ) and at least three fluid connections ( 1, 2, 3 ), extending through the valve housing a main piston ( 18 ), running in the valve housing ( 10 ) and a pilot piston ( 24 ), for executing a pilot control ( 26 ), which may be controlled by means of a current-carrying magnetic device ( 28 ), whereby during an open pilot control ( 26 ), fluid from one ( 2 ) of the both connectors ( 1, 2 ), controlled by the main piston ( 18 ), reaches the connector ( 3 ), controlled by the pilot piston ( 24 ), by means of a cross-sectional narrowing ( 38 ) in the main piston ( 19 ) and the pilot control ( 26 ) and hence, as a result of the corresponding pressure drop, the main piston ( 18 ) achieves a control position, controlling both fluid connections ( 1, 2 ) with regard to fluid amount.
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