pressure difference control valve
pressure difference control valve
压差控制阀
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Performance experiments about ZY47 pressure -difference control valve and ZL47 flux control valve have been done, based on their structure and work principle, presented the method of type selection.
对ZY 47型自力式压差控制阀和ZL47型流量控制阀进行了性能实验，并依据它们的结构特点和工作原理，提出了选型方法。
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