调速阀的节流调速回路特点 1 在负载变化较大，v稳定性要求较高的场合，则用调速阀替代节流阀，当△P>△P min，qV不随△P而变化，所以速度刚性明显优于节流阀调速 2 虽解决了速度稳定性问题，但因既有△P溢，又有△P节，还有△P减，所以，△P更大，一般用于P较小，但F变化较大而v稳定性要求较高的场合。
容积调速回路特点 ∵节流调速回路效率低、发热大，只适用于小功率场合 ∴而容积调速回路，因无节流损失或溢流损失 故效率高，发热小，一般用于大功率场合 容积调速回路分类 按油路循环方式分为 开式和闭式 按所用执行元件不同分为泵—缸式 和泵—马达式 变量泵和定量电机容积调速回路的工作特点 ① nM=qP/VM ②∵ VM=定值 ∴ 调节qP即可改变nM ② 若不计损失，在调速范围内， ∴ 称恒转矩容积调速 定量泵-变量电机容积调速回路的工作特点 nM=qP/VM ∵ qP=定值 ∴ 调节VM即可改变nM 定量泵 ∵ nM与VM成反比 TM与VM成正比 ∴ VM↑，nM↓，TM↑； VM↓，nM↑，TM↓， 以致带不动负载，使马达“自锁”。
故 这种回路很少单独使用 变量泵-变量电机容积调速回路工作原理 第一段：先将VM调至最大并固定，然后将VP由小→大,分两段调节就，nM从0 ↑nM’（变—定） 第二段：将VP固定至最大，VM由大→小，nM从nM’↑nMmax（定—变） ∴调速范围大，λ可达100。
变量泵-变量电机容积调速回路的特点 ∵ nM低时TM大，nM高时TM小 ∴ 正好符合大部分机械要求 故 多用于机床主运动、纺织机械、矿山机械 容积节流调速回路 ∵ 容积调速回路虽然效率高，发热小，但仍存在速度负载特性较软的问题（主要由于泄漏所引起）。
∴ 常用于低速、稳定性要求高的场合(如机床进给系统) 特点 1 qP自动与流量阀调节相吻合，无△P溢，η高 2 进入执行元件的q与F变化无关，且自动补偿泄漏，速度稳定性好 3 因回路有节流损失，所以η<η容 4 便于实现快进—工进—快退工作循环 限压式变量泵和调速阀调速回路工作原理 联合调速，v由调速阀调定，qP与q1自动适应。
qP>q1，pP↑，通过反馈，qp↓qP=q1 >v=c q P 0、5Mpa(中低压) 若△P<过小，v稳定性不好 限压式变量泵和调速阀调速回路特点 ∵ 本回路的pP为一定值 又∵ 若负载变化大时，节流损失大，低速工作时，泄漏量大，系统效率降低 ∴ 用于低速、轻载时间较长且变载的场合时，效率很低。
故本回路多用于机床进给系统中 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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