[化] 减压阀

reducing valve的用法和样例：

例句

No relief valve is required where two pressure reducing valves are installed.如果装上两个减压阀，就不需要安全阀。
Look for any signs of leaking between the gun and the unloader valve.检查一下水枪和减压阀是否有泄漏的迹象。

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