英语语法分析

Close the shutoff valve upstream of the regulator.

关闭调节阀上游的关断阀。

Globe valves are used where throttling or both throttling and shutoff are required.

截止阀用于需要节流，或既需要节流也需要关闭的应用场合。

Unscrew the aerator from the faucet, turn the water on at the shutoff valves, and open the faucet.

松开水龙头的透气口，打开总阀送水，打开水龙头。