压差变量泵和节流阀调速回路的工作原理 工进时，节流阀调节q1，qP与之适应 qP>q1时，pP↑，定子右移，e↓，qP↓ qP定子左移，e↑，qP↑ 直至qP=q1，v=c 差压变量泵和节流阀调速回路的特点： 虽用了节流阀，但具有调速阀的性能，即q1不受负载变化影响 ∵定子受力平衡方程 pPA1+pP(A2-A1)=p1A2+FS ∴ △p=pP-p1=FS/A2=c 又∵ pP随负载变化而变化，p1也变化， ∴ 它被称为变压积节流调速回路，又称变压型容积节流调速回路△qP小η高因采用固定阻尼孔，防止定子快速移动 而振动。
差压差压变量泵和节流阀调速回路:适用于负载变化大、速度低的中小功率系统 快速回路功用：使执行元件获得必要的高速，以提高效率，充分利用功率 快速回路分类 双泵供油增速 蓄能器供油增速 变量泵供油增速 液压缸差动连接增速 液压缸差连接快速回路工作原理 液压缸差动连接快速回路的特点:实质性↓A以↑v，简单易行，应用广泛，但由于部分差动qV↑，管道和阀门应大规格。
速度换接回路功用：完成系统中执行元件依次实现几种速度的换接实质上是一种分级（或有级）调速回路，但速度是根据需要事先调好，这是和调速回路的不同之处 速度换接回路分类： 快速与慢速的换接 两种慢速的换接 速度换接方法 各种增速回路 电磁阀的换接回路 行程阀的换接回路 快速与慢速的换接回路举例 1 二位二通电磁阀与调速阀 电磁阀与调速阀换接回路特点：安装连接比较方便，易于实现自动控制，但速度换接平稳性和可靠性以及换接精度都较差。
行程阀的快慢速换接回路工作原理：液压缸快进，压下行程阀，液压缸工进24S左位，液压缸快退 行程阀的快慢速换接回路特点：速度换接平稳，动作可靠，换接精度较好，但行程阀必须安装在液压缸附近 两种进给速度更换回路 1.调速阀串联的换接回路 特点：v1>v2，否则2不起作用 2.调速阀并联的换接回路 特点：v1、v2互不影响，但因A、B任意一个工作时，另一个减压阀阀口最大，一旦换接易前冲。
所以改为下图所示，可避免前冲，但△P↑ 90-L-075-MA-1-CD-60-S-3-T1-D-05-GBA-42-42-24 90L075MA1CD60S3T1D05GBA424224 90-L-075-MA-1-CD-61-S-3-S1-D-03-GBA-35-35-24 90L075MA1CD61S3S1D03GBA353524 90-L-075-MA-1-CD-80-L-3-S1-D-03-GBA-35-35-24 90L075MA1CD80L3S1D03GBA353524 90-L-075-MA-1-CD-80-L-3-S1-E-03-GBA-17-17-24 90L075MA1CD80L3S1E03GBA171724 90-L-075-MA-1-CD-80-L-3-T2-E-03-GBA-17-17-24 90L075MA1CD80L3T2E03GBA171724 90-L-075-MA-1-CD-80-P-4-S1-D-03-GBA-35-35-20 90L075MA1CD80P4S1D03GBA353520 90-L-075-MA-1-CD-80-R-3-C7-E-03-GBA-35-35-28 90L075MA1CD80R3C7E03GBA353528 90-L-075-MA-1-CD-80-R-3-S1-D-03-GBA-42-42-24 90L075MA1CD80R3S1D03GBA424224 90-L-075-MA-1-CD-80-S-3-C6-D-03-GBA-35-35-24 90L075MA1CD80S3C6D03GBA353524 90-L-075-MA-1-CD-80-S-3-C6-D-03-GBA-42-42-24 90L075MA1CD80S3C6D03GBA424224 90-L-075-MA-1-CD-80-S-3-S1-D-03-GBA-29-29-24 90L075MA1CD80S3S1D03GBA292924 90-L-075-MA-1-NN-60-D-3-S1-L-03-GBA-38-38-24 90L075MA1NN60D3S1L03GBA383824 90-L-075-MA-1-NN-60-L-3-C6-D-03-GBA-42-42-24 90L075MA1NN60L3C6D03GBA424224 90-L-075-MA-1-NN-60-L-3-C6-E-03-GBA-35-35-24 90L075MA1NN60L3C6E03GBA353524 90L075-MA-1-NN-60-L-4-C6-D-04-GBA-35-35-24 90L075MA1NN60L4C6D04GBA353524 90-L-075-MA-1-NN-60-L-4-C6-D-04-GBA-35-35-24 90L075MA1NN60L4C6D04GBA353524 90-L-075-MA-1-NN-60-L-4-S1-E-03-GBA-32-32-24 90L075MA1NN60L4S1E03GBA323224 90-L-075-MA-1-NN-60-P-3-C7-D-03-GBA-42-42-24 90L075MA1NN60P3C7D03GBA424224 90-L-075-MA-1-NN-60-R-3-S1-D-03-GBA-32-32-24 90L075MA1NN60R3S1D03GBA323224 90-L-075-MA-1-NN-60-R-4-T1-D-03-GBA-29-29-20 90L075MA1NN60R4T1D03GBA292920 90-L-075-MA-1-NN-60-S-3-C6-C-03-GBA-35-35-20 90L075MA1NN60S3C6C03GBA353520 90-L-075-MA-1-NN-60-S-3-C6-D-03-GBA-35-35-24 90L075MA1NN60S3C6D03GBA353524 90-L-075-MA-1-NN-60-S-3-C6-E-03-GBA-35-35-20 90L075MA1NN60S3C6E03GBA353520 90-L-075-MA-1-NN-60-S-3-C6-E-03-GBA-35-35-24 90L075MA1NN60S3C6E03GBA353524 90-L-075-MA-1-NN-60-S-3-C6-E-03-GBA-38-38-20 90L075MA1NN60S3C6E03GBA383820 90-L-075-MA-1-NN-60-S-3-C6-E-03-GBA-38-38-24 90L075MA1NN60S3C6E03GBA383824 90-L-075-MA-1-NN-60-S-3-C7-D-03-GBA-26-26-24 90L075MA1NN60S3C7D03GBA262624 90-L-075-MA-1-NN-60-S-3-C7-D-03-GBA-35-35-20 90L075MA1NN60S3C7D03GBA353520 90-L-075-MA-1-NN-60-S-3-C7-D-03-GBA-35-35-24 90L075MA1NN60S3C7D03GBA353524 90-L-075-MA-1-NN-60-S-3-C7-D-03-GBA-42-42-24 90L075MA1NN60S3C7D03GBA424224 90-L-075-MA-1-NN-60-S-3-C7-E-03-GBA-38-38-24 90L075MA1NN60S3C7E03GBA383824 90-L-075-MA-1-NN-60-S-3-S1-D-02-GBA-35-35-20 90L075MA1NN60S3S1D02GBA353520 90-L-075-MA-1-NN-60-S-3-S1-D-03-GBA-26-26-24 90L075MA1NN60S3S1D03GBA262624 90-L-075-MA-1-NN-60-S-3-S1-D-03-GBA-32-32-24 90L075MA1NN60S3S1D03GBA323224 90-L-075-MA-1-NN-60-S-3-S1-D-03-GBA-35-35-24 90L075MA1NN60S3S1D03GBA353524 90-L-075-MA-1-NN-60-S-3-S1-D-03-GBA-38-38-24 90L075MA1NN60S3S1D03GBA383824 90-L-075-MA-1-NN-60-S-3-S1-D-03-GBA-42-42-24 90L075MA1NN60S3S1D03GBA424224 90-L-075-MA-1-NN-60-S-3-S1-D-03-GBA-42-42-28 90L075MA1NN60S3S1D03GBA424228 90L075-MA-1-NN-60-S-3-S1-D-05-GBA-42-42-24 90L075MA1NN60S3S1D05GBA424224 90-L-075-MA-1-NN-60-S-3-S1-D-05-GBA-42-42-24 90L075MA1NN60S3S1D05GBA424224 90L075-MA-1-NN-60-S-3-S1-D-C6-GBA-42-42-24 90L075MA1NN60S3S1DC6GBA424224 90-L-075-MA-1-NN-60-S-3-S1-D-C6-GBA-42-42-24 90L075MA1NN60S3S1DC6GBA424224 90-L-075-MA-1-NN-60-S-3-S1-E-03-GBA-35-35-24 90L075MA1NN60S3S1E03GBA353524 90-L-075-MA-1-NN-60-S-3-S1-E-03-GBA-42-42-24 90L075MA1NN60S3S1E03GBA424224 90-L-075-MA-1-NN-60-S-3-T1-E-05-GBA-42-42-24 90L075MA1NN60S3T1E05GBA424224 90-L-075-MA-1-NN-60-S-4-S1-C-03-GBA-29-29-24 90L075MA1NN60S4S1C03GBA292924 90-L-075-MA-1-NN-60-S-4-S1-D-02-GBA-26-26-24 90L075MA1NN60S4S1D02GBA262624 90-L-075-MA-1-NN-60-S-4-S1-D-05-GBA-35-35-24 90L075MA1NN60S4S1D05GBA353524 90-L-075-MA-1-NN-61-S-3-C6-C-03-GBA-35-35-24 90L075MA1NN61S3C6C03GBA353524 90-L-075-MA-1-NN-61-S-3-C6-D-03-GBA-26-26-20 90L075MA1NN61S3C6D03GBA262620 90-L-075-MA-1-NN-61-S-3-C7-D-03-GBA-29-29-20 90L075MA1NN61S3C7D03GBA292920 90-L-075-MA-1-NN-61-S-3-C7-D-03-GBA-35-35-24 90L075MA1NN61S3C7D03GBA353524 90-L-075-MA-1-NN-61-S-3-S1-D-03-GBA-35-35-24 90L075MA1NN61S3S1D03GBA353524 90-L-075-MA-1-NN-80-L-3-C6-D-03-GBA-35-35-24 90L075MA1NN80L3C6D03GBA353524 90-L-075-MA-1-NN-80-L-3-C6-D-03-GBA-42-42-20 90L075MA1NN80L3C6D03GBA424220 90-L-075-MA-1-NN-80-L-3-C6-E-03-GBA-35-35-24 90L075MA1NN80L3C6E03GBA353524 90-L-075-MA-1-NN-80-L-3-C6-E-03-GBA-42-42-20 90L075MA1NN80L3C6E03GBA424220 90-L-075-MA-1-NN-80-L-3-C7-D-09-GBA-42-42-20 90L075MA1NN80L3C7D09GBA424220 90L075-MA-1-NN-80-L-3-C7-D-09-GBA-42-42-22 90L075MA1NN80L3C7D09GBA424222 90-L-075-MA-1-NN-80-L-3-C7-D-09-GBA-42-42-22 90L075MA1NN80L3C7D09GBA424222 90-L-075-MA-1-NN-80-L-3-S1-D-03-GBA-35-35-24 90L075MA1NN80L3S1D03GBA353524 90-L-075-MA-1-NN-80-L-3-S1-E-03-GBA-32-32-24 90L075MA1NN80L3S1E03GBA323224 90L075-MA-1-NN-80-P-3-C6-C-09-GBA-36-36-20 90L075MA1NN80P3C6C09GBA363620 90-L-075-MA-1-NN-80-P-3-C6-C-09-GBA-36-36-20 90L075MA1NN80P3C6C09GBA363620 90L075-MA-1-NN-80-P-3-C7-D-09-GBA-45-45-20 90L075MA1NN80P3C7D09GBA454520 90-L-075-MA-1-NN-80-P-3-C7-D-09-GBA-45-45-20 90L075MA1NN80P3C7D09GBA454520 90-L-075-MA-1-NN-80-P-3-S1-D-03-GBA-23-23-24 90L075MA1NN80P3S1D03GBA232324 90-L-075-MA-1-NN-80-P-4-S1-E-03-GBA-23-23-24 90L075MA1NN80P4S1E03GBA232324 90-L-075-MA-1-NN-80-P-4-S1-E-03-GBA-35-35-20 90L075MA1NN80P4S1E03GBA353520 90-L-075-MA-1-NN-80-P-4-S1-E-03-GBA-42-42-24 90L075MA1NN80P4S1E03GBA424224 90-L-075-MA-1-NN-80-R-3-C6-D-03-GBA-23-23-24 90L075MA1NN80R3C6D03GBA232324 90-L-075-MA-1-NN-80-R-3-C7-E-03-GBA-26-26-28 90L075MA1NN80R3C7E03GBA262628 90-L-075-MA-1-NN-80-R-3-S1-D-03-GBA-23-23-24 90L075MA1NN80R3S1D03GBA232324 90-L-075-MA-1-NN-80-S-3-C6-D-03-GBA-35-35-24 90L075MA1NN80S3C6D03GBA353524 90-L-075-MA-1-NN-80-S-3-C6-D-03-GBA-42-42-24 90L075MA1NN80S3C6D03GBA424224。
