調(diào)速閥也可以設(shè)計(jì)成先節(jié)流后減壓的結(jié)構(gòu)。
調(diào)速閥是由定差減壓閥于節(jié)流閥竄連而成的組合閥。其中節(jié)流閥用來調(diào)節(jié)通過的流量，定差減壓閥則自動(dòng)補(bǔ)償負(fù)載變化的影響，使節(jié)流閥前后的壓差為定值，消除了負(fù)載變化對(duì)流量的影響。
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