self-operated differential pressure control valve
...自力式压差控制阀；分户热计量 [gap=463]Key words：variable flow system，self-operated differential pressure control valve，measurable heat-supply system ...
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self-operated differential pressure control valve
自力式压差控制阀
以上为机器翻译结果，长、整句建议使用 人工翻译 。