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。
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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