Refer to flow direction arrow on valve nameplate or body.

参照阀门铭牌或阀体上的流向箭头。

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Install regulator in the line with the arrow on the body pointing in the direction of flow.

在管道上安装调节阀，将阀体上的箭头指向水流方向。

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Install the Watts regulator in the supply line to the boiler with the arrow on the valve body pointing in the direction of flow to the boiler.

在锅炉的供水管道上安装美国瓦茨调节阀，将调节阀阀体上的箭头指向锅炉的水流方向。

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That's what this arrow at the right shows, the direction of the flow of information.

这就是右边这个箭头的含义,即信息流动的方向

耶鲁公开课 - 生物医学工程探索课程节选