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diverter van , reversal valve
The pneumatic control system is designed to control either of two valves by using a panel mounted selector switch to choose the valve to be controlled.
气动控制系统采用一个控制面板，安装选择开关来选择所控制的阀门，实现对两个阀门的任何一个单独控制的功能。
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The writ also alleges the problem with the fuel selector valve was the cause of the crash and states that Ravenair were responsible for its maintenance.
BBC: Joel McNicholls
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