武漢力士樂節流閥Z2DB10VD3-4X/200V 節流閥是通過改變節流截面或節流長度以控制流體流量的閥門。將節流閥和單向閥并聯則可組合成單向節流閥。節流閥和單向節流閥是簡易的流量控制閥，在定量泵液壓系統中，節流閥和溢流閥配合，可組成三種節流調速系統，即進油路節流調速系統、回油路節流調速系統和旁路節流調速系統。節流閥沒有流量負反饋功能，不能補償由負載變化所造成的速度不穩定，一般僅用于負載變化不大或對速度穩定性要求不高的場合
節流閥的性能要求是：
·流量調節范圍大，流量一壓差變化平滑；
·內泄漏量小，若有外泄漏油口，外泄漏量也要小；
·調節力矩小，動作靈敏。
節流閥(Choke valve)的外形結構與截止閥并無區別，只是它們啟閉件的形狀有所不同。
節流閥的啟閉件大多為圓錐流線型，通過它改變通道截面積而達到調節流量和壓力。節流閥供在壓力降極大的情況下作降低介質壓力之用。介質在節流閥瓣和閥座之間流速很大，以致使這些零件表面很快損壞－即所謂氣蝕現象。為了盡量減少氣蝕影響，閥瓣采用耐氣蝕材料（合金鋼制造）并制成頂jian角為140～180的流線型圓錐體這還能使閥瓣能有較大的開啟高度，一般不推薦在小縫隙下節流。由于節流閥的流量不僅取決于節流口面積的大小，還與節流口前后的壓差有關，閥的剛度小，
故只適用于執行元件負載變化很小且速度穩定性要求不高的場合。
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