密封装置功用：防止液压油的泄漏 对密封装置的要求：良好的密封性、耐磨性、经济性 常见密封形式 （1）间隙密封 （2）密封圈密封 间隙密封密封原理：利用相对运动零件配合面之间的微小间隙来防止泄漏 间隙密封平衡槽作用 1）自动对中心，减小摩擦力 2）增大了泄漏阻力，减小了偏心量，提高了密封性能。
3）储存油液，自动润滑间隙密封特点应用 ∵ 结构简单，摩擦阻力小，耐高温，但泄漏较大，并且随着时间的增加而增加，加工要求高 ∴ 主要用于尺寸小，压力低，速度高的液压缸或各种阀 密封圈类型：O、LX、Y、V型和组合式等 密封圈材料：耐油橡胶、尼龙 O型密封圈密封原理:密封圈的安装变形用于密封 O型密封圈特点 ∵ O型圈截面为圆形，结构简单，制造方便，密 封性能好，摩擦力小。
∴ 一般安装在外圆或内圆上截面为矩形的沟槽 内以实现密封 又∵ O型圈一般为橡胶制成 运动密封（动）— p>10Mpa ∴ 压力高时32Mpa， O型密封圈应用相当广泛,既可用于动密封,又可用于静密封 Y型密封圈密封原理:密封圈受油压作用使两唇张开并贴紧在轴或孔的表面实现密封。
Y型密封圈分类 根据截面长宽比例不同 分为宽断面 和窄断面 Y型密封圈特点 ∵ Y型圈靠唇边张开后实现密封 ∴ 安装时唇边必须对着压力油腔 又∵ Y型圈密封可靠，摩擦力小，寿命长 ∴ 常用于速度较高的液压缸 Y型密封圈应用 宽断面Y型密封圈：p<20Mpa 00 T在-30—+100 通常 窄断面Y型密封圈：p<32Mpa 00 T在-30—+100 V型密封圈结构：截面为V型，由支承环、密封环、压紧环叠合而成，开口面向高压侧。
V型密封圈密封原理：当压紧环压紧密封环时，支承环使密封环产生变形而实现密封 V型密封圈特点应用 ∵ V型密封圈是组合装置 ∴ 密封效果良好，耐高压，寿命长，增 加密封环可提高密封效果，但摩阻力增大，尺寸大，成本高。
故 常用于压力较高p<50Mp），温 度为-400—+800，运动速度较低的场合实现密封 油封的功用：设置在液压泵或液压马达的伸轴处，对外防尘，对内防漏 油封的分类：骨架式、无骨架式 油管 ——传递工作液体 管接头——连接油管与 油管 或元件 要 求：足够的强度、良好的密封、较小的压力损失、方便的装拆性。
油管尺寸的计算 计算依据：q、p 计算参数：d、δ 公式：d=2√q/πv 对橡胶软管，由p和d选标准 d算出后<中低压，选标准规格 金属管0、5 mm 管接头要求：连接牢固、密封可靠、装配方便、工艺性好、外形尺寸小、通油能力强。
管接头分类 按接头分 1 硬管接头 2 插入快换式接头 3 胶管接头 4 快速接头 按连接体形式分 普通细牙螺纹（高压） 锥螺纹（中低压） 90-L-075-KA-1-CD-60-S-3-T2-D-03-GBA-35-35-24 90L075KA1CD60S3T2D03GBA353524 90L075-KA-1-CD-60-S-3-T2-E-03-GBA-29-29-24 90L075KA1CD60S3T2E03GBA292924 90-L-075-KA-1-CD-60-S-3-T2-E-03-GBA-29-29-24 90L075KA1CD60S3T2E03GBA292924 90-L-075-KA-1-CD-60-S-4-S1-D-03-GBA-42-42-24 90L075KA1CD60S4S1D03GBA424224 90-L-075-KA-1-CD-80-L-3-S1-D-03-GBA-23-23-24 90L075KA1CD80L3S1D03GBA232324 90-L-075-KA-1-CD-80-L-4-S1-D-00-GBA-14-14-24 90L075KA1CD80L4S1D00GBA141424 90-L-075-KA-1-CD-80-L-4-S1-D-00-GBA-35-35-24 90L075KA1CD80L4S1D00GBA353524 90-L-075-KA-1-CD-80-P-3-C7-E-00-GBA-42-42-24 90L075KA1CD80P3C7E00GBA424224 90L075-KA-1-CD-80-R-3-C7-D-03-GBA-35-35-24 90L075KA1CD80R3C7D03GBA353524 90-L-075-KA-1-CD-80-R-3-C7-D-03-GBA-35-35-24 90L075KA1CD80R3C7D03GBA353524 90-L-075-KA-1-CD-80-R-3-S1-D-03-GBA-35-35-24 90L075KA1CD80R3S1D03GBA353524 90-L-075-KA-1-CD-80-R-3-S1-D-03-GBA-38-38-24 90L075KA1CD80R3S1D03GBA383824 90-L-075-KA-1-CD-80-R-4-C6-E-02-GBA-29-29-24 90L075KA1CD80R4C6E02GBA292924 90-L-075-KA-1-CD-80-R-4-S1-D-03-GBA-26-26-24 90L075KA1CD80R4S1D03GBA262624 90-L-075-KA-1-CD-80-R-4-S1-D-03-GBA-29-29-24 90L075KA1CD80R4S1D03GBA292924 90-L-075-KA-1-CD-80-R-4-S1-D-03-GBA-38-38-24 90L075KA1CD80R4S1D03GBA383824 90-L-075-KA-1-CD-80-R-4-S1-D-03-GBA-42-42-24 90L075KA1CD80R4S1D03GBA424224 90L075-KA-1-CD-80-S-3-C7-C-02-FAC-42-42-24 90L075KA1CD80S3C7C02FAC424224 90-L-075-KA-1-CD-80-S-3-C7-C-02-FAC-42-42-24 90L075KA1CD80S3C7C02FAC424224 90L075-KA-1-CD-80-S-3-C7-D-03-GBA-35-35-24 90L075KA1CD80S3C7D03GBA353524 90-L-075-KA-1-CD-80-S-3-C7-D-03-GBA-35-35-24 90L075KA1CD80S3C7D03GBA353524 90-L-075-KA-1-CD-80-S-3-C7-E-03-GBA-42-42-24 90L075KA1CD80S3C7E03GBA424224 90-L-075-KA-1-CD-80-S-3-S1-D-03-EBC-38-38-24 90L075KA1CD80S3S1D03EBC383824 90-L-075-KA-1-CD-80-S-3-S1-E-03-GBA-42-42-24 90L075KA1CD80S3S1E03GBA424224 90-L-075-KA-1-CD-80-S-4-S1-D-03-GBA-35-35-24 90L075KA1CD80S4S1D03GBA353524 90L075-KA-1-NN-60-L-3-C7-D-03-GBA-38-38-20 90L075KA1NN60L3C7D03GBA383820 90-L-075-KA-1-NN-60-L-3-C7-D-03-GBA-38-38-20 90L075KA1NN60L3C7D03GBA383820 90-L-075-KA-1-NN-60-L-3-S1-D-03-EBC-38-38-24 90L075KA1NN60L3S1D03EBC383824 90-L-075-KA-1-NN-60-P-3-C6-E-02-GBA-42-42-24 90L075KA1NN60P3C6E02GBA424224 90-L-075-KA-1-NN-60-P-3-C7-E-04-GBA-42-42-24 90L075KA1NN60P3C7E04GBA424224 90-L-075-KA-1-NN-60-P-3-S1-D-00-GBA-38-38-24 90L075KA1NN60P3S1D00GBA383824 90-L-075-KA-1-NN-60-P-3-S1-D-03-GBA-23-23-20 90L075KA1NN60P3S1D03GBA232320 90-L-075-KA-1-NN-60-P-3-S1-D-03-GBA-32-32-24 90L075KA1NN60P3S1D03GBA323224 90-L-075-KA-1-NN-60-P-3-S1-D-03-GBA-35-35-20 90L075KA1NN60P3S1D03GBA353520 90-L-075-KA-1-NN-60-P-3-S1-D-03-GBA-42-42-20 90L075KA1NN60P3S1D03GBA424220 90-L-075-KA-1-NN-60-P-3-S1-E-03-GBA-42-14-24 90L075KA1NN60P3S1E03GBA421424 90-L-075-KA-1-NN-60-P-3-T2-D-03-GBA-38-26-24 90L075KA1NN60P3T2D03GBA382624 90-L-075-KA-1-NN-60-R-3-S1-D-03-EBC-38-38-24 90L075KA1NN60R3S1D03EBC383824 90-L-075-KA-1-NN-60-R-3-S1-D-03-GBA-29-29-24 90L075KA1NN60R3S1D03GBA292924 90-L-075-KA-1-NN-60-R-3-S1-D-03-GBA-35-35-24 90L075KA1NN60R3S1D03GBA353524 90-L-075-KA-1-NN-60-R-4-S1-C-03-GBA-29-29-24 90L075KA1NN60R4S1C03GBA292924 90-L-075-KA-1-NN-60-R-4-S1-D-00-GBA-26-26-24 90L075KA1NN60R4S1D00GBA262624 90-L-075-KA-1-NN-60-R-4-S1-D-03-GBA-42-42-24 90L075KA1NN60R4S1D03GBA424224 90-L-075-KA-1-NN-60-S-3-C6-C-03-GBA-35-35-24 90L075KA1NN60S3C6C03GBA353524 90-L-075-KA-1-NN-60-S-3-C6-D-03-GBA-35-35-24 90L075KA1NN60S3C6D03GBA353524 90L075-KA-1-NN-60-S-3-C7-D-03-GBA-23-23-24 90L075KA1NN60S3C7D03GBA232324 90-L-075-KA-1-NN-60-S-3-C7-D-03-GBA-23-23-24 90L075KA1NN60S3C7D03GBA232324 90L075-KA-1-NN-60-S-3-C7-D-03-GBA-35-35-24 90L075KA1NN60S3C7D03GBA353524 90-L-075-KA-1-NN-60-S-3-C7-D-03-GBA-35-35-24 90L075KA1NN60S3C7D03GBA353524 90-L-075-KA-1-NN-60-S-3-S1-C-03-GBA-35-35-24 90L075KA1NN60S3S1C03GBA353524 90-L-075-KA-1-NN-60-S-3-S1-D-03-EBC-38-38-24 90L075KA1NN60S3S1D03EBC383824 90-L-075-KA-1-NN-60-S-3-S1-D-03-GBA-32-32-24 90L075KA1NN60S3S1D03GBA323224 90-L-075-KA-1-NN-60-S-3-S1-D-03-GBA-35-35-24 90L075KA1NN60S3S1D03GBA353524 90-L-075-KA-1-NN-60-S-3-S1-D-03-GBA-38-38-24 90L075KA1NN60S3S1D03GBA383824 90-L-075-KA-1-NN-60-S-3-S1-E-03-GBA-32-32-28 90L075KA1NN60S3S1E03GBA323228 90-L-075-KA-1-NN-60-S-3-S1-E-03-GBA-35-35-28 90L075KA1NN60S3S1E03GBA353528 90L075-KA-1-NN-60-S-4-C6-E-03-GBA-32-32-24 90L075KA1NN60S4C6E03GBA323224 90-L-075-KA-1-NN-60-S-4-C6-E-03-GBA-32-32-24 90L075KA1NN60S4C6E03GBA323224 90-L-075-KA-1-NN-60-S-4-S1-D-03-GBA-35-35-24 90L075KA1NN60S4S1D03GBA353524 90-L-075-KA-1-NN-60-S-4-S1-D-03-GBA-42-42-24 90L075KA1NN60S4S1D03GBA424224 90-L-075-KA-1-NN-60-S-4-S1-D-04-GBA-35-35-24 90L075KA1NN60S4S1D04GBA353524 90-L-075-KA-1-NN-61-P-3-S1-D-03-GBA-35-35-20 90L075KA1NN61P3S1D03GBA353520 90-L-075-KA-1-NN-80-D-4-S1-L-00-GBA-20-20-24 90L075KA1NN80D4S1L00GBA202024 90-L-075-KA-1-NN-80-D-4-S1-L-03-GBA-42-42-24 90L075KA1NN80D4S1L03GBA424224 90-L-075-KA-1-NN-80-L-3-S1-D-03-GBA-35-35-24 90L075KA1NN80L3S1D03GBA353524 90-L-075-KA-1-NN-80-L-3-S1-D-04-GBA-29-29-28 90L075KA1NN80L3S1D04GBA292928 90-L-075-KA-1-NN-80-P-3-S1-D-03-EBC-35-14-24 90L075KA1NN80P3S1D03EBC351424 90-L-075-KA-1-NN-80-P-3-S1-D-03-GBA-29-29-24 90L075KA1NN80P3S1D03GBA292924 90-L-075-KA-1-NN-80-P-3-S1-D-04-GBA-42-42-24 90L075KA1NN80P3S1D04GBA424224 90-L-075-KA-1-NN-80-P-3-S1-E-00-GBA-42-42-24 90L075KA1NN80P3S1E00GBA424224 90-L-075-KA-1-NN-80-P-4-S1-D-03-GBA-17-17-24 90L075KA1NN80P4S1D03GBA171724 90-L-075-KA-1-NN-80-P-4-S1-D-03-GBA-35-35-24 90L075KA1NN80P4S1D03GBA353524 90-L-075-KA-1-NN-80-P-4-S1-D-03-GBA-38-38-24 90L075KA1NN80P4S1D03GBA383824 90-L-075-KA-1-NN-80-R-3-C7-D-04-GBA-26-26-20 90L075KA1NN80R3C7D04GBA262620 90-L-075-KA-1-NN-80-R-3-C7-E-03-GBA-35-35-24 90L075KA1NN80R3C7E03GBA353524 90-L-075-KA-1-NN-80-R-3-S1-D-03-GBA-23-23-24 90L075KA1NN80R3S1D03GBA232324 90-L-075-KA-1-NN-80-R-3-S1-D-03-GBA-29-29-24 90L075KA1NN80R3S1D03GBA292924 90-L-075-KA-1-NN-80-R-3-S1-D-03-GBA-35-35-24 90L075KA1NN80R3S1D03GBA353524 90-L-075-KA-1-NN-80-R-3-S1-D-03-GBA-38-38-24 90L075KA1NN80R3S1D03GBA383824。
