液壓元件可分為動力元件和控制元件以及執行元件三大類。盡管都是液壓元件，它們的自身功能和安裝使用的技術要求也不盡相同，現分別介紹如下：

動力元件：指的是各種液壓泵，齒輪泵、葉片泵、柱塞泵、螺桿泵。

  1、齒輪油泵和串聯泵（包括外嚙合與內嚙合）兩種結構型式。

  2、葉片油泵（包括單級泵、變量泵、雙級泵、雙聯泵）。

  3、柱塞油泵，又分為軸向柱塞油泵和徑向柱塞油泵，軸向柱塞泵有定量泵、變量泵、（變量泵又分為手動變量與壓力補償變量、伺服變量等多種）從結構上又分為端面配油和閥式配油兩種配油方式，而徑向柱塞泵的配油型式，基本上為閥式配油。）；

  執行元件：液壓缸和液壓馬達，液壓缸有活塞液壓缸、柱塞液壓缸、擺動液壓缸、組合液壓缸；液壓馬達有齒輪式液壓馬達、葉片液壓馬達、柱塞液壓馬達；

  控制元件：方向控制閥、單向閥、換向閥；

  壓力控制閥：溢流閥、減壓閥、順序閥、壓力繼電器等；

  流量控制閥：節流閥、調速閥、分流閥；

  輔助元件：除上述三部分以外的其它元件，包括壓力表、濾油器、蓄能裝置、冷卻器、管件{主要包括： 各種管接頭（擴口式、焊接式、卡套式，sae法蘭）、高壓球閥、快換接頭、軟管總成、測壓接頭、管夾等}及油箱等，它們同樣十分重要。

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