The most common control valves are the parabolic plug and the V-ported valve.

最常用的控制阀具有抛物线形阀芯和V形开口阀芯。

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The most common control valves are the parabolic plug and the V-ported valve.

最常用的控制阀具有抛物线形阀芯和V形开口阀芯。

youdao