?液壓泵的輸出功率 PP=pPqP=常數 液壓缸的輸出功率 P1=Fv=Fq1/A=p1q1 回路的功率損失 △p=pP-p1=pPqP-p1q1=pP（q1+△q）-(pP-△p)q1=pP△q+△pq1 △q=qP-q1 溢流損失 △pY=pP△q 節流損失 △pT=△pq1 回路的效率 η=p1/p,P=Fv/pPqP=p1q1/pPqP ∵存在兩部分功率損失 ∴這種調速回路效率較低 節流閥出口節流調速回路特征：將節流閥串聯在液壓缸的回油路上，即串聯在缸和油箱之間，調節AT，可調節q2以改變速度，仍應和溢流閥聯合使用，pP=pS。
與進口節流調速回路相同處 ∵v—F特性基本與進口節流相似 ∴上述結論都適用于此? 不同于進口節流調速回路 1）承受負值負載能力 2）實現壓力控制的方便性 3）最低穩定速度? 承受負值負載能力 ∵回油路節流閥使缸有一定背壓 ∴能承受負值負載，并↑v穩定性，而進油路則需在回油路上增加背壓閥方可承受，△P↑。
實現壓力控制的方便性 ∵進油路調速中工作臺碰到死擋鐵后，活塞停止，缸進油腔油壓上升至pS? ∴便于實現壓力（升壓）控制而回油路調?速在上述工況時，進油腔壓力變化很小，無法控壓，而回油腔p↓0，可降壓發訊，但電路復雜。
最低穩定速度 ∴在缸徑、缸速相同情況下，進油節流調速回路流量閥開?口較大，低速時不易堵塞 ∵若回路使用單桿缸，無桿腔進油量大于有桿腔回油流量? 節流閥旁路節流調速回路特征：將節流閥裝在與執行元件并聯的支路上，即與缸并聯，溢流閥做安全閥，pP取決于負載，pP=p1=△p=F/A 缸（q1） q< 節流閥→T 節流閥旁節流調速回路工作特點分析 （1）速度負載特性 （2）最大承載能力 （3）功率和效率 q1=qP-qT=(qtP-△qP)-qT φ =(qtP-kLpP)-CAT△p φ =qtp-kL(F/A)-CAT(F/A) 故液壓缸的工作速度為： φ v=q1/A=[qtp-kL(F?/A)-CAT(F/A)]/A 結論：①AT=C，F↑，v↓,F↓，v↑，即v—F特性更軟 ②F=C,↑AT，v↓;↓AT↑v，即速度隨AT而變化 節流閥旁路節流調速回路最大承載力 AT↑，阻力↓，Fmax↓，即低速承載能力小，AT至一定值時，即使F很小，qp→節→T,V=0，所以Fmax既與AT有關，又受安全閥調定壓力的限制。
節流閥旁路節流調速回路功率和效率? ∵pP隨F變化而變化，只有△P節，而無△P溢 ∴η高，發熱少 節流閥旁節流調速回路應用 ∵v—F特性較軟，低速承載能力差 ∴一般用于高速、重載、對速度平?穩性要求很低的較大功率場合，如：牛頭刨床主運動系統、輸送機械液壓系統、大型拉床液壓系統、龍門刨床液壓系統等。
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