The moving parts of the device are placed in the initial position by spring force after the actuating force has been removed (e.g. in spring-centred directional valves or spring pre-load on check valves).
Fluidlexikon
The moving parts of the device are placed in the initial position by spring force after the actuating force has been removed (e.g. in spring-centred directional valves or spring pre-load on check valves).
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