基本回路定义:由有关液压元件组成，并能完成某一特定功能的典型（简单）油路结构 基本回路分类: 按功用分:方向控制回路、压力控制回路、速度控制回路、多缸工作控制回路 速度控制回路功能:改变执行元件的速度 速度控制回路分类：调速、换速、增速回路等 调速回路调速原理 液压缸：v=q/A 液压马达：n=q/Vm 由上两式知： 改变q、Vm、A，皆可改变v或n，一般A是不可改变的。
液压缸：改变q，即可改变v；液压马达：既可改变q，又可改变Vm 调速回路调速方法 节流调速——改变q 容积调速——改变泵和马达的V 容积节流调速——既可改变q，又可改变V 对调速回路的要求 调速范围大，速度稳定性好，效率高 节流调速回路组成：定量泵、流量阀、溢流阀、执行元件等。
节流调速回路的工作原理：通过改变流量控制阀口的流量面积，控制执行器的流量，调整其运动速度 节流调速回路分类 按采用流量阀不同 分为节流阀节流调速、调速阀节流调速、 按流量阀安装位置不同分为进油路、回油路、旁油路 节流阀进口节流调速回路的特点：在步入液压缸油的路上串联节流阀，即在泵与缸之间串联，调整a节，可改变q，改变速度，必须与溢流阀一起使用。
节流阀进口 qp：节流阀 → 液压缸，溢流阀 → 油箱 节流阀进口节流速度回路工作特点分析 1）速度负载特性 2）最大承载能力 3)功率和效率 速度负载特性 液压缸稳定工作时的受力平衡方程 p1A=F+p2A ∵ p2→T pp=pS=C ∴ p2=0 p1=F/A 故 节流阀两端的压力差为 △p=pP-p1=pP-F/A 通过节流阀进入液压缸的流量为： φ φ q1=CAT△p=CAT（PP-F/A） 液压缸的运动速度 φ v=q1/A=CAT(pP-F/A)/A 结论：v∝AT 改变 AT，即可改变 q1 改变v。
A T 调定，v随F变化而变化 速度负载特性结论 ① AT=C,F↑,v↓ ∴ 速度负载特性软，即轻载时刚性好 ② F=C,AT越小，v刚性越好，即低速时刚性好 最大承载能力 ∵PP=pS=C， ∴不论AT如何变化，其最大承载能力 不变即Fmax=p P AT 故 称为恒推力调速（或恒转矩调速） 90-L-075-MA-1-NN-80-S-3-C6-E-03-GBA-42-42-24 90L075MA1NN80S3C6E03GBA424224 90-L-075-MA-1-NN-80-S-3-C7-D-03-GBA-35-35-24 90L075MA1NN80S3C7D03GBA353524 90-L-075-MA-1-NN-80-S-3-C7-D-04-FAC-38-38-24 90L075MA1NN80S3C7D04FAC383824 90-L-075-MA-1-NN-80-S-3-C7-D-09-GBA-42-42-20 90L075MA1NN80S3C7D09GBA424220 90-L-075-MA-1-NN-80-S-3-C7-E-03-GBA-32-32-20 90L075MA1NN80S3C7E03GBA323220 90-L-075-MA-1-NN-80-S-3-S1-D-03-GBA-26-26-20 90L075MA1NN80S3S1D03GBA262620 90-L-075-MA-1-NN-80-S-3-S1-D-03-GBA-35-35-20 90L075MA1NN80S3S1D03GBA353520 90-L-075-MA-1-NN-80-S-3-S1-D-03-GBA-35-35-24 90L075MA1NN80S3S1D03GBA353524 90-L-075-MA-1-NN-80-S-3-S1-D-03-GBA-42-42-24 90L075MA1NN80S3S1D03GBA424224 90-L-075-MA-1-NN-80-S-3-S1-E-03-GBA-35-35-24 90L075MA1NN80S3S1E03GBA353524 90-L-075-MA-1-NN-80-S-3-T1-E-03-GBA-42-42-24 90L075MA1NN80S3T1E03GBA424224 90-L-075-MA-1-NN-80-S-3-T2-D-03-GBA-42-42-24 90L075MA1NN80S3T2D03GBA424224 90-L-075-MA-1-NN-80-S-3-T2-E-04-GBA-35-35-24 90L075MA1NN80S3T2E04GBA353524 90-L-075-MA-1-NN-80-S-4-S1-C-03-GBA-35-35-24 90L075MA1NN80S4S1C03GBA353524 90-L-075-MA-1-NN-80-S-4-S1-D-03-GBA-26-26-24 90L075MA1NN80S4S1D03GBA262624 90-L-075-MA-1-NN-80-S-4-S1-D-03-GBA-26-26-24-F058 90L075MA1NN80S4S1D03GBA262624F058 90L075-MA-1-NN-80-S-4-T2-E-04-GBA-32-32-20 90L075MA1NN80S4T2E04GBA323220 90-L-075-MA-1-NN-80-S-4-T2-E-04-GBA-32-32-20 90L075MA1NN80S4T2E04GBA323220 90L075-MA-1-NN-80-S-4-T2-E-04-GBA-32-32-20-F001 90L075MA1NN80S4T2E04GBA323220F001 90-L-075-MA-1-NN-81-R-3-S1-D-03-GBA-32-32-24 90L075MA1NN81R3S1D03GBA323224 90-L-075-MA-1-NN-81-S-3-S1-D-03-GBA-35-35-24 90L075MA1NN81S3S1D03GBA353524 90-L-075-MA-1-NN-81-S-3-T2-E-03-GBA-35-35-20 90L075MA1NN81S3T2E03GBA353520 90L075-MA-2-BB-60-P-3-C7-D-03-GBA-42-42-24 90L075MA2BB60P3C7D03GBA424224 90-L-075-MA-2-BB-60-P-3-C7-D-03-GBA-42-42-24 90L075MA2BB60P3C7D03GBA424224 90L075-MA-2-BC-60-S-3-C7-D-03-GBA-14-32-24 90L075MA2BC60S3C7D03GBA143224 90-L-075-MA-2-BC-60-S-3-C7-D-03-GBA-14-32-24 90L075MA2BC60S3C7D03GBA143224 90-L-075-MA-2-BC-60-S-4-S1-E-05-GBA-26-26-28 90L075MA2BC60S4S1E05GBA262628 90-L-075-MA-2-NN-80-S-3-C6-E-02-GBA-42-42-24 90L075MA2NN80S3C6E02GBA424224 90-L-075-MA-2-NN-80-S-3-S1-D-03-GBA-35-35-24 90L075MA2NN80S3S1D03GBA353524 90-L-075-MA-2-NN-80-S-3-S1-E-03-GBA-42-42-24 90L075MA2NN80S3S1E03GBA424224 90L075-MA-5-AB-60-S-3-C6-D-C6-GBA-29-29-24 90L075MA5AB60S3C6DC6GBA292924 90-L-075-MA-5-AB-60-S-3-C6-D-C6-GBA-29-29-24 90L075MA5AB60S3C6DC6GBA292924 90L075-MA-5-AB-60-S-4-S1-D-C6-GBA-42-42-24 90L075MA5AB60S4S1DC6GBA424224 90-L-075-MA-5-AB-60-S-4-S1-D-C6-GBA-42-42-24 90L075MA5AB60S4S1DC6GBA424224 90L075-MA-5-BB-60-R-3-C7-D-C5-FAC-42-42-24 90L075MA5BB60R3C7DC5FAC424224 90-L-075-MA-5-BB-60-R-3-C7-D-C5-FAC-42-42-24 90L075MA5BB60R3C7DC5FAC424224 90-L-075-MA-5-BB-80-P-3-S1-D-C6-GBA-42-42-24 90L075MA5BB80P3S1DC6GBA424224 90L075-MA-5-BB-80-S-3-C7-D-C6-GBA-40-40-24 90L075MA5BB80S3C7DC6GBA404024 90-L-075-MA-5-BB-80-S-3-C7-D-C6-GBA-40-40-24 90L075MA5BB80S3C7DC6GBA404024 90L075-MA-5-BB-80-S-3-C7-D-C6-GBA-42-42-24 90L075MA5BB80S3C7DC6GBA424224 90-L-075-MA-5-BB-80-S-3-C7-D-C6-GBA-42-42-24 90L075MA5BB80S3C7DC6GBA424224 90L075-MA-5-BC-60-P-3-S1-D-C5-GBA-42-42-24 90L075MA5BC60P3S1DC5GBA424224 90-L-075-MA-5-BC-60-P-3-S1-D-C5-GBA-42-42-24 90L075MA5BC60P3S1DC5GBA424224 90L075-MA-5-BC-60-S-3-C7-E-C5-GBA-42-42-24 90L075MA5BC60S3C7EC5GBA424224 90-L-075-MA-5-BC-60-S-3-C7-E-C5-GBA-42-42-24 90L075MA5BC60S3C7EC5GBA424224 90L075-MA-5-CD-60-S-3-C6-D-C5-GBA-42-42-24 90L075MA5CD60S3C6DC5GBA424224 90-L-075-MA-5-CD-60-S-3-C6-D-C5-GBA-42-42-24 90L075MA5CD60S3C6DC5GBA424224 90L075-MA-5-CD-60-S-3-S1-D-C6-GBA-21-21-24 90L075MA5CD60S3S1DC6GBA212124 90-L-075-MA-5-CD-60-S-3-S1-D-C6-GBA-21-21-24 90L075MA5CD60S3S1DC6GBA212124 90-L-075-MA-5-NN-60-S-3-C6-D-C3-GBA-35-35-24 90L075MA5NN60S3C6DC3GBA353524 90-L-075-MA-5-NN-60-S-3-C6-D-C5-GBA-35-35-24 90L075MA5NN60S3C6DC5GBA353524 90L075-MA-5-NN-60-S-3-S1-D-C5-GBA-42-42-24 90L075MA5NN60S3S1DC5GBA424224 90-L-075-MA-5-NN-60-S-3-S1-D-C5-GBA-42-42-24 90L075MA5NN60S3S1DC5GBA424224 90L075-MA-5-NN-60-S-4-S1-D-C4-GBA-20-20-20 90L075MA5NN60S4S1DC4GBA202020 90-L-075-MA-5-NN-60-S-4-S1-D-C4-GBA-20-20-20 90L075MA5NN60S4S1DC4GBA202020 90-L-075-MA-5-NN-60-S-4-S1-D-C4-GBA-20-20-24 90L075MA5NN60S4S1DC4GBA202024 90L075-MA-5-NN-80-P-3-C7-D-C4-GBA-45-45-20 90L075MA5NN80P3C7DC4GBA454520 90-L-075-MA-5-NN-80-P-3-C7-D-C4-GBA-45-45-20 90L075MA5NN80P3C7DC4GBA454520 90L075-MA-5-NN-80-P-4-C6-D-C4-GBA-35-35-24 90L075MA5NN80P4C6DC4GBA353524 90-L-075-MA-5-NN-80-P-4-C6-D-C4-GBA-35-35-24 90L075MA5NN80P4C6DC4GBA353524 90-L-075-MA-5-NN-80-R-3-S1-D-C5-GBA-32-32-24 90L075MA5NN80R3S1DC5GBA323224 90-L-075-MA-5-NN-80-R-4-S1-E-C5-GBA-23-23-24 90L075MA5NN80R4S1EC5GBA232324 90L075-MA-5-NN-80-S-3-C7-D-C5-GBA-17-17-24 90L075MA5NN80S3C7DC5GBA171724 90-L-075-MA-5-NN-80-S-3-C7-D-C5-GBA-17-17-24 90L075MA5NN80S3C7DC5GBA171724 90-L-075-MA-5-NN-80-S-3-S1-D-C5-GBA-35-35-24 90L075MA5NN80S3S1DC5GBA353524 90-L-075-MA-5-NN-80-S-3-S1-D-C5-GBA-38-38-24 90L075MA5NN80S3S1DC5GBA383824 90L075-MA-5-NN-80-S-4-C6-C-C5-GBA-42-42-24 90L075MA5NN80S4C6CC5GBA424224 90-L-075-MA-5-NN-80-S-4-C6-C-C5-GBA-42-42-24 90L075MA5NN80S4C6CC5GBA424224 90-L-075-MA-5-NN-81-R-3-S1-D-C5-GBA-42-42-24 90L075MA5NN81R3S1DC5GBA424224。
