调节阀,节制阀;阶段制动阀

graduating valve的用法和样例：

例句

Install a shutoff valve upstream of the regulator.在调节阀的上游安装关闭阀。
If uneven pressure should cause the regulator to pulsate, its action can be stabilized by throttling the valve.如果不稳定的压力导致调节阀波动，则这种波动通过对阀门节流将稳定下来。

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