?調速閥的節流調速回路特點 1 在負載變化較大，v穩定性要求較高的場合，則用調速閥替代節流閥，當△P>△P min，qV不隨△P而變化，所以速度剛性明顯優于節流閥調速 2 雖解決了速度穩定性問題，但因既有△P溢，又有△P節，還有△P減，所以，△P更大，一般用于P較小，但F變化較大而v穩定性要求較高的場合。
容積調速回路特點 ∵節流調速回路效率低、發熱大，只適用于小功率場合 ∴而容積調速回路，因無節流損失或溢流損失 故效率高，發熱小，一般用于大功率場合 容積調速回路分類 按油路循環方式分為 開式和閉式 按所用執行元件不同分為泵—缸式 和泵—馬達式 變量泵和定量電機容積調速回路的工作特點 ① nM=qP/VM ②∵ VM=定值 ∴ 調節qP即可改變nM ② 若不計損失，在調速范圍內， ∴ 稱恒轉矩容積調速 定量泵-變量電機容積調速回路的工作特點 nM=qP/VM ∵ qP=定值 ∴ 調節VM即可改變nM 定量泵 ∵ nM與VM成反比 TM與VM成正比 ∴ VM↑，nM↓，TM↑； VM↓，nM↑，TM↓， 以致帶不動負載，使馬達“自鎖”。
故 這種回路很少單獨使用 變量泵-變量電機容積調速回路工作原理 第一段：先將VM調至最大并固定，然后將VP由小→大,分兩段調節就，nM從0 ↑nM’（變—定） 第二段：將VP固定至最大，VM由大→小，nM從nM’↑nMmax（定—變） ∴調速范圍大，λ可達100。
變量泵-變量電機容積調速回路的特點 ∵ nM低時TM大，nM高時TM小 ∴ 正好符合大部分機械要求 故 多用于機床主運動、紡織機械、礦山機械 容積節流調速回路 ∵ 容積調速回路雖然效率高，發熱小，但仍存在速度負載特性較軟的問題（主要由于泄漏所引起）。
∴ 常用于低速、穩定性要求高的場合(如機床進給系統) 特點 1 qP自動與流量閥調節相吻合，無△P溢，η高 2 進入執行元件的q與F變化無關，且自動補償泄漏，速度穩定性好 3 因回路有節流損失，所以η<η容 4 便于實現快進—工進—快退工作循環 限壓式變量泵和調速閥調速回路工作原理 聯合調速，v由調速閥調定，qP與q1自動適應。
qP>q1，pP↑，通過反饋，qp↓qP=q1 >v=c q P 0、5Mpa(中低壓) 若△P<過小，v穩定性不好 限壓式變量泵和調速閥調速回路特點 ∵ 本回路的pP為一定值 又∵ 若負載變化大時，節流損失大，低速工作時，泄漏量大，系統效率降低 ∴ 用于低速、輕載時間較長且變載的場合時，效率很低。
故本回路多用于機床進給系統中 90-L-075-MA-1-AB-60-L-3-C6-D-03-GBA-42-42-24 90L075MA1AB60L3C6D03GBA424224 90-L-075-MA-1-AB-60-L-3-C7-D-03-GBA-32-32-20 90L075MA1AB60L3C7D03GBA323220 90-L-075-MA-1-AB-60-P-3-C6-D-03-GBA-42-42-20 90L075MA1AB60P3C6D03GBA424220 90-L-075-MA-1-AB-60-P-3-S1-D-03-GBA-29-29-24 90L075MA1AB60P3S1D03GBA292924 90-L-075-MA-1-AB-60-P-3-S1-D-03-GBA-38-38-20 90L075MA1AB60P3S1D03GBA383820 90-L-075-MA-1-AB-60-R-3-T1-E-03-GBA-26-26-24 90L075MA1AB60R3T1E03GBA262624 90-L-075-MA-1-AB-60-S-3-C6-D-03-GBA-35-35-24 90L075MA1AB60S3C6D03GBA353524 90-L-075-MA-1-AB-60-S-3-C6-D-03-GBA-42-42-24 90L075MA1AB60S3C6D03GBA424224 90-L-075-MA-1-AB-60-S-3-C7-D-04-GBA-42-42-20 90L075MA1AB60S3C7D04GBA424220 90-L-075-MA-1-AB-60-S-4-S1-D-05-GBA-35-35-24 90L075MA1AB60S4S1D05GBA353524 90-L-075-MA-1-AB-61-P-3-T1-D-03-GBA-32-32-24 90L075MA1AB61P3T1D03GBA323224 90-L-075-MA-1-AB-61-P-3-T1-D-03-GBA-42-42-24 90L075MA1AB61P3T1D03GBA424224 90-L-075-MA-1-AB-61-S-3-T2-D-03-GBA-35-35-24 90L075MA1AB61S3T2D03GBA353524 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