液压泵是工程机械设备上常用的动力设备之一，它的工作过程主要是将流体从管道输送到油缸和活塞的中间通过改变液体的粘度和压力来实现流体的压力和流量当流体压力降低到一定程度时，流体在液体中被截留，从而获得液体的流体。
它的产生方法有很多，例如：泵、压力泵、油压泵等为了实现泵的工作时流体的压力能传递给压力容器其压力必须能通过传递介质中压力的介质来实现常用的有液体和气体两种流体. 一、油泵工作原理 油泵是将流体从油管或软管中吸入泵内，通过传动装置将流体送到机械上或者其他设备上。
油泵的作用是把液态介质从油管输送到油缸或活塞中进行工作如果只有气体流体时，用气体泵；如果有液体介质时，用液体泵、液体油泵或油液混合泵液压泵一般采用单级单涡轮活塞式(DCF)泵、双级双涡轮活塞式(DCF)泵。
二、液压阀 液压阀在机械上应用最广泛，它的种类繁多主要分为液压启闭的气动式液压阀门和电动式液压阀两大类其中液压启闭的气动式液压阀称为气动密封阀其主要优点在于：结构简单、维修方便、维护费用低；通用性强、成本低；寿命长；密封性好；维护简单、价格便宜；易于安装维护及清洗；阀体内压差小；压力损失小；噪声低；使用寿命长；制造容易且价格低廉；对工作环境要求不高等。
但是缺点也是非常明显的：阀芯材料易老化且磨损严重；对液压油来说存在两种情况：一是流动介质在阀芯内被截留；二是在流动过程中被流体截留引起密封失效 三、油缸 油缸主要是用于液压传动中的机械设备中使用它包括活塞杆。
这是最常见的两种活塞杆主要由两个零件组成它是用来将液压油或空气压力传递到活塞上的装置油缸也可以由三个零件组成：固定套、密封件 90L100-KA-5-AB-60-S-3-C7-F-03-GBA-42-42-24 90L100KA5AB60S3C7F03GBA424224 90-L-100-KA-5-AB-60-S-3-C7-F-03-GBA-42-42-24 90L100KA5AB60S3C7F03GBA424224 90L100-KA-5-AB-60-S-3-S1-F-00-GBA-42-42-24 90L100KA5AB60S3S1F00GBA424224 90-L-100-KA-5-AB-60-S-3-S1-F-00-GBA-42-42-24 90L100KA5AB60S3S1F00GBA424224 90L100-KA-5-AB-60-S-3-S1-F-04-GBA-35-35-24 90L100KA5AB60S3S1F04GBA353524 90-L-100-KA-5-AB-60-S-3-S1-F-04-GBA-35-35-24 90L100KA5AB60S3S1F04GBA353524 90L100-KA-5-AB-60-S-4-C7-E-03-GBA-30-30-24 90L100KA5AB60S4C7E03GBA303024 90-L-100-KA-5-AB-60-S-4-C7-E-03-GBA-30-30-24 90L100KA5AB60S4C7E03GBA303024 90L100-KA-5-AB-60-S-4-C7-E-03-GBA-35-35-24 90L100KA5AB60S4C7E03GBA353524 90-L-100-KA-5-AB-60-S-4-C7-E-03-GBA-35-35-24 90L100KA5AB60S4C7E03GBA353524 90L100-KA-5-AB-60-S-4-C7-E-03-GBA-42-42-24 90L100KA5AB60S4C7E03GBA424224 90-L-100-KA-5-AB-60-S-4-C7-E-03-GBA-42-42-24 90L100KA5AB60S4C7E03GBA424224 90L100-KA-5-AB-60-S-4-C7-E-05-FAC-38-38-28 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