?調(diào)速閥的節(jié)流調(diào)速回路特點 1 在負載變化較大，v穩(wěn)定性要求較高的場合，則用調(diào)速閥替代節(jié)流閥，當△P>△P min，qV不隨△P而變化，所以速度剛性明顯優(yōu)于節(jié)流閥調(diào)速 2 雖解決了速度穩(wěn)定性問題，但因既有△P溢，又有△P節(jié)，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(wěn)定性要求較高的場合。
容積調(diào)速回路特點 ∵節(jié)流調(diào)速回路效率低、發(fā)熱大，只適用于小功率場合 ∴而容積調(diào)速回路，因無節(jié)流損失或溢流損失 故效率高，發(fā)熱小，一般用于大功率場合 容積調(diào)速回路分類 按油路循環(huán)方式分為 開式和閉式 按所用執(zhí)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(diào)速回路的工作特點 ① nM=qP/VM ②∵ VM=定值 ∴ 調(diào)節(jié)qP即可改變nM ② 若不計損失，在調(diào)速范圍內(nèi)， ∴ 稱恒轉(zhuǎn)矩容積調(diào)速 定量泵-變量電機容積調(diào)速回路的工作特點 nM=qP/VM ∵ qP=定值 ∴ 調(diào)節(jié)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(diào)速回路工作原理 第一段：先將VM調(diào)至最大并固定，然后將VP由小→大,分兩段調(diào)節(jié)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(diào)速范圍大，λ可達100。
變量泵-變量電機容積調(diào)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(jié)流調(diào)速回路 ∵ 容積調(diào)速回路雖然效率高，發(fā)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(wěn)定性要求高的場合(如機床進給系統(tǒng)) 特點 1 qP自動與流量閥調(diào)節(jié)相吻合，無△P溢，η高 2 進入執(zhí)行元件的q與F變化無關(guān)，且自動補償泄漏，速度穩(wěn)定性好 3 因回路有節(jié)流損失，所以η<η容 4 便于實現(xiàn)快進—工進—快退工作循環(huán) 限壓式變量泵和調(diào)速閥調(diào)速回路工作原理 聯(lián)合調(diào)速，v由調(diào)速閥調(diào)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(wěn)定性不好 限壓式變量泵和調(diào)速閥調(diào)速回路特點 ∵ 本回路的pP為一定值 又∵ 若負載變化大時，節(jié)流損失大，低速工作時，泄漏量大，系統(tǒng)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(tǒng)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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