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Sigma KEE - DirectionalControlValve
KB Term: 
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方向控制阀
Valve that controls the direction of flow of a fluid
Relationships      
Parents A Device that regulates, directs or controls the FlowFn of a Fluid (Gas, Liquid, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. (Wikipedia)
Children 滑阀a directional control valve that uses a spool to control the direction of flow


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