减压阀功用 功用：降低系统某一支路的油液压力，使同一系统有两个或多个不同压力 减压阀分类：直动式、先导式??定值减压阀/定差减压阀 减压阀减压原理 减压原理：利用油液在某处的压力损失，使出口压力低于进口压力，并保持恒定，因此也称为定值减压阀。
工作原理 p2导阀关闭，主阀左位，f最?大，不减压 p2>pt时，导阀打开，主阀两端产生压差 当△P软t时，同上 当△P>F软t时，主阀阀芯右移，f↓，p2↓ 先导式减压阀调压原理 调压原理：调节调压弹簧，改变?硬弹簧力，即可改变出口压力。
减压阀特点 特点：在减压阀出口油液不再流动时，由于先导阀卸油仍未停止，减?压口仍有油液流动，阀就处于工作状态，出口压力也就保持调定压力不变 减压阀与溢流阀比较 溢流阀、减压阀 a保持进口压力不变出口压力 b内部回油外部回油 c阀口常闭阀口常开 d阀芯二凸肩阀芯三凸肩 e??一般并联于系统一般串联于系统 顺序阀功用 功能：液压系统压力变化?控制油路的通断，实现多个液压元件按一定顺序移动。
顺序阀分类 按结构形式:直动式、先导式 按泄漏方式：内泄式、外泄式 直动式顺序阀工作原理 pA阀口关闭，AB pA>Ft,阀口打开，AB，下一个执行元件动作 直动式顺序阀调节原理 调节原理：调节调压螺钉，改变弹簧?力，即可改变开启压力。
压力继电器功用 功用：根据系统压力变化，自动接通或断开电路，实现程?序控制或安全保护 压力继电器组成 压力—位移转换器：柱塞式、弹簧管式、膜片式、波纹管式 微动开关 压力继电器主要性能 1调压范围,即发出电信号的最低和?最高工作压力的范围。
调整调压螺帽，即调整工作压力 2通断调节区间（返回区间） 开启压力-闭合压力=返回区间 压力继电器工作原理 pk>pT时，柱塞上升，发出信号 pk柱塞下降，断开信号 90-L-075-KA-1-AB-60-L-3-T1-D-00-GBA-29-29-24 90L075KA1AB60L3T1D00GBA292924 90-L-075-KA-1-AB-60-P-3-C6-D-03-GBA-35-35-20 90L075KA1AB60P3C6D03GBA353520 90-L-075-KA-1-AB-60-P-3-C7-D-02-GBA-42-42-24 90L075KA1AB60P3C7D02GBA424224 90-L-075-KA-1-AB-60-P-3-C7-D-03-GBA-42-42-24 90L075KA1AB60P3C7D03GBA424224 90-L-075-KA-1-AB-60-P-3-S1-D-03-GBA-32-32-24 90L075KA1AB60P3S1D03GBA323224 90L075-KA-1-AB-60-P-3-T2-D-03-GBA-38-14-24 90L075KA1AB60P3T2D03GBA381424 90-L-075-KA-1-AB-60-P-3-T2-D-03-GBA-38-14-24 90L075KA1AB60P3T2D03GBA381424 90-L-075-KA-1-AB-60-P-3-T2-D-03-GBA-38-26-24 90L075KA1AB60P3T2D03GBA382624 90-L-075-KA-1-AB-60-P-4-C6-D-03-GBA-21-21-24 90L075KA1AB60P4C6D03GBA212124 90-L-075-KA-1-AB-60-P-4-S1-E-03-GBA-26-26-24 90L075KA1AB60P4S1E03GBA262624 90L075-KA-1-AB-60-P-4-S1-E-03-GBA-35-35-24 90L075KA1AB60P4S1E03GBA353524 90-L-075-KA-1-AB-60-P-4-S1-E-03-GBA-35-35-24 90L075KA1AB60P4S1E03GBA353524 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90-L-075-KA-1-AB-80-R-3-S1-D-02-GBA-35-35-24 90L075KA1AB80R3S1D02GBA353524 90-L-075-KA-1-AB-80-R-3-S1-E-03-GBA-35-35-24 90L075KA1AB80R3S1E03GBA353524 90-L-075-KA-1-AB-80-R-3-T1-E-03-EBC-38-14-24 90L075KA1AB80R3T1E03EBC381424 90-L-075-KA-1-AB-80-R-4-S1-D-03-GBA-38-38-24 90L075KA1AB80R4S1D03GBA383824 90L075-KA-1-AB-80-S-3-C7-D-03-GBA-32-32-26 90L075KA1AB80S3C7D03GBA323226 90-L-075-KA-1-AB-80-S-3-C7-D-03-GBA-32-32-26 90L075KA1AB80S3C7D03GBA323226 90L075-KA-1-AB-80-S-3-S1-C-02-GBA-42-42-24 90L075KA1AB80S3S1C02GBA424224 90-L-075-KA-1-AB-80-S-3-S1-C-02-GBA-42-42-24 90L075KA1AB80S3S1C02GBA424224 90-L-075-KA-1-AB-80-S-3-S1-D-03-GBA-35-35-24 90L075KA1AB80S3S1D03GBA353524 90-L-075-KA-1-AB-81-S-3-T2-E-00-GBA-35-35-20 90L075KA1AB81S3T2E00GBA353520 90-L-075-KA-1-AC-80-L-4-S1-D-00-GBA-35-35-24 90L075KA1AC80L4S1D00GBA353524 90-L-075-KA-1-AC-80-S-3-S1-E-00-GBA-42-42-24 90L075KA1AC80S3S1E00GBA424224 90-L-075-KA-1-BB-60-S-3-C6-C-03-GBA-35-35-24 90L075KA1BB60S3C6C03GBA353524 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