調速閥也可以設計成先節流后減壓的結構。
調速閥是由定差減壓閥于節流閥竄連而成的組合閥。其中節流閥用來調節通過的流量，定差減壓閥則自動補償負載變化的影響，使節流閥前后的壓差為定值，消除了負載變化對流量的影響。
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