化工控制回路中调节器作用方向判断是《化工自动化及仪表》课程中的教学难点。

Judgement of direction of the regulator function in a control circuit is a teaching jungle of the course Automation and Meters in Chemical industry.

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但在液压回路中需要油流反向流动时又可利用控制油压，打开单向阀，使油流在两个方向都可流动。

However, the need for oil flow in hydraulic circuit reverse flows can use hydraulic control, opening a one-way valve, so that the flow of oil can flow in both directions.

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在化工控制回路中判断调节器作用方向时，可根据回路中负反馈环节个数来确定，当形成回路负反馈时，反作用方向的环节数应为单数个。

When the direction is judged the feedback - sector Numbers must be identified. When the minus feedback is formed, the factors in the opposite direction should be odd number.

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