| 摘要 |
The unit (1) is assembled of a housing (2), an inlet (3), an outlet (4), and a valve element (6) working in combination with the valve seat (5) and controlled by a pilot valve (22). A first section of the flow path is positioned in the inner space (7) and a pressure area (17) is located between the housing (2) and the valve element (6) facilitating the built-up of pressure when the pilot valve (22) is closed.
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