?液壓泵是工程機械設備上常用的動力設備之一，它的工作過程主要是將流體從管道輸送到油缸和活塞的中間通過改變液體的粘度和壓力來實現流體的壓力和流量當流體壓力降低到一定程度時，流體在液體中被截留，從而獲得液體的流體。
它的產生方法有很多，例如：泵、壓力泵、油壓泵等為了實現泵的工作時流體的壓力能傳遞給壓力容器其壓力必須能通過傳遞介質中壓力的介質來實現常用的有液體和氣體兩種流體. 一、油泵工作原理 油泵是將流體從油管或軟管中吸入泵內，通過傳動裝置將流體送到機械上或者其他設備上。
油泵的作用是把液態介質從油管輸送到油缸或活塞中進行工作如果只有氣體流體時，用氣體泵；如果有液體介質時，用液體泵、液體油泵或油液混合泵液壓泵一般采用單級單渦輪活塞式(DCF)泵、雙級雙渦輪活塞式(DCF)泵。
二、液壓閥 液壓閥在機械上應用最廣泛，它的種類繁多主要分為液壓啟閉的氣動式液壓閥門和電動式液壓閥兩大類其中液壓啟閉的氣動式液壓閥稱為氣動密封閥其主要優點在于：結構簡單、維修方便、維護費用低；通用性強、成本低；壽命長；密封性好；維護簡單、價格便宜；易于安裝維護及清洗；閥體內壓差小；壓力損失小；噪聲低；使用壽命長；制造容易且價格低廉；對工作環境要求不高等。
但是缺點也是非常明顯的：閥芯材料易老化且磨損嚴重；對液壓油來說存在兩種情況：一是流動介質在閥芯內被截留；二是在流動過程中被流體截留引起密封失效 三、油缸 油缸主要是用于液壓傳動中的機械設備中使用它包括活塞桿。
這是最常見的兩種活塞桿主要由兩個零件組成它是用來將液壓油或空氣壓力傳遞到活塞上的裝置油缸也可以由三個零件組成：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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