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根据用途不同分为方向阀组件、压力阀组件和流量阀组件。同一通径的三种组件安装尺寸相同，但阀芯的结构形式和阀套座直径不同。三种组件均有两个主油口A和B、一个控制口x。
插装阀基本组件：1-阀套2-密封件3-阀芯4-弹簧5-盖板6-阻尼孔7-阀芯。

插装阀主要组合与功能
1、插装方向控制阀
插装阀可以组合成各式方向控制阀。
1)作单向阀
将x腔和A或B腔连通，即成为单向阀。连接方法不同，其导通方式也不同。若在控制盖板上如图5c连接一个二位三通液动换向阀，即可组成液控单向阀。
2)
作二位二通阀
二位三通阀，即可组成二位二通电液阀。
3)作二位三通阀
连接二位四通阀，即可组成二位三通电液换向阀。
4)作二位四通阀
连接二位四通阀，即可组成二位四通电液换向阀。
5)作三位四通阀0型换向阀
连接三位四通阀换向阀和单向阀，即可组成三位四通阀中位为0型电液换向阀。
6)作多机能四通阀
连接换向阀，利用对电磁换向阀的控制实现多机能功能。
2、插装压力控制阀
对插装阀的x腔进行压力控制，便可构成压力控制阀。
1)作溢流阀或顺序阀
在压力型插装阀芯的控制盖板上连接先导调压阀(溢流阀) ,当出油口接油箱，此阀起溢流阀作用;当出油口接另一工作油路，则为顺序阀。
2)作卸荷阀
连接二位二通换向阀，当电磁铁通电时，出口接油箱，则构成卸荷阀。
3)作减压阀
采用插装阀芯和溢流阀连接，则构成减压阀。液压油P从1流入P2流出，出口油液通过阀芯上的中心阻尼孔、盖板和先导阀接通。当减压阀出口的压力较小，不足以顶开先导阀芯时，主阀芯上的阻尼孔只起通油作用，使主阀芯上、下两腔的液压力相等，而上腔又有一个小弹簧作用，必使主阀芯处在F端极限位置，减压阀芯大开，不起减压作用; 当压力增大到先导阀的开启压力时，先导阀打开，泄漏油液单独流回油箱，实行外泄。减压阀在调定压力下正常工作时，由于出口压力与先导 阀溢流压力和主阀芯弹簧力的平衡作用，维持节流降压口为某定值。当出口压力增大，由于阻尼孔液流阻力的作用产生压力降，主阀芯所受的力不平衡，使阀芯上移，减小节流降压口，使节流降压作用增强;反之，出口的压力减小时，阀芯下移，增大节流降压口，使节流降压作用减弱，控制出口的压力维持在调定值。
3、插装流量控制阀
插装流量阀同样有节流阀和调速阀等型式。
1)作节流阀
在方向控制插装阀的盖板上安装阀芯行程调节器，调节阀芯和阀体间节流口的开度便可控制阀口的通流面积，起节流阀的作用，如图12a。实际应用时，起节流阀作用的插装阀芯一般采用滑阀结构，并在阀芯上开节流沟槽。
2)作调速阀
插装式节流阀同样具有随负载变化流量不稳定的问题。如果采取措施保证节流阀的进、出口压力差恒定，则可实现调速阀功能。如图12b连接的减压阀和节流阀就起到这样的作用。

液压机是对金属材料塑料、橡胶和粉末冶金制品进行压力加工的设备，在工业部门得到了广泛应用,如金属材料的拉伸、冲裁弯曲翻边冷挤压以及成型加工等，还用于校正、压装、粉末冶金制品和磨料制品的压制成型及塑料制品、绝缘材料的压制成型等。为完成上述工作,液压机应能产生较大的压力,因此,液压系统工作压力、尺寸和流量也大,对其设计要求也高,是较典型的高压大流量系统。①液压系统压力应能经常变换和调节,并能产生较大压力，以满足不同的工作要求。②空程速度大、加压时推力大,系统功率大,要求功率利用率高。③空程与压制时,其速度与压力相差甚大,所以多采用高低压泵组或恒功率变量泵供油系统.以满足低压快速行程和高压慢速行程要求。

力士乐二通插装阀控制盖板LFA40H2-71/FX20

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液压挖掘机主要由发动机、液压系统、工作装置、行走装置和电气控制等部分组成。液压系统由液压泵、控制阀、液压缸、液压马达、管路、油箱等组成。电气控制系统包括监控盘、发动机控制系统、泵控制系统、各类传感器、电磁阀等。
液压挖掘机一般由工作装置、上部车体和下部车体三大部分组成。据其构造和用途可以区分为：履带式、轮胎式、步履式、全液压、半液压、全回转、非全回转、通用型、专用型、铰接式、伸缩臂式等多种类型。
工作装置是直接完成挖掘任务的装置。它由动臂、斗杆、铲斗等三部分铰接而成。为了适应各种不同施工作业的需要，液压挖掘机可以配装多种工作装置，如挖掘、起重、装载、平整、夹钳、推土、冲击锤，旋挖钻等多种作业机具。
回转与行走装置是液压挖掘机的机体，转台上部设有动力装置和传动系统。发动机是液压挖掘机的动力源，大多采用柴油要在方便的场地， 也可改用电动机。
液压传动系统通过液压泵将发动机的动力传递给液压马达、液压缸等执行元件，推动工作装置动作，从而完成各种作业。

挖掘机械一般由动力装置、传动装置、行走装置和工作装置等组成。单斗挖掘机和斗轮挖掘机还有转台，多斗挖掘机还有物料输送装置。动力装置有柴油机、电动机、柴油发电机组或外电源变流机组。柴油机和电动机大多用于中、小型挖掘机械，用一台原动机集中驱动，两者可互换。柴油发电机组和外电源变流机组用于大、中型挖掘机械，用多台电机分散驱动。行走装置主要用来支承机器、使机器变换工作位置和转移作业场地；另外，链斗式挖掘机和环轮式挖掘机的铲斗，随着行走装置的连续行走而切削土壤。行走装置有履带式、轮胎式、步行式、轨行式、浮游式和拖挂式等几种。作业场地固定、要求接地比压较低时用履带式；作业场地多变时用轮胎式；因施工条件特殊而必须架设专用轨道时，用轨行式；挖掘水下泥土用浮游式；小型单斗挖掘机的行走装置无动力源时，用拖挂式；作业场地固定、机器重量大时，用步行式。步行式行走装置大多用于单斗挖掘机中的大、中型拉铲挖掘机和斗轮挖掘机。

工作装置是液压挖掘机的主要组成部分，挖掘机配置的是反铲工作装置，它主要用于挖掘停机面以下的土壤，但也可以挖掘最大切削高度以下的土壤，除了可以挖坑、开沟、装载外还可以进行简单平整场地工作。挖掘作业适应于开挖Ⅰ~Ⅳ级土，Ⅴ级以上用液压锤或需爆破手段。反铲工作装置由动臂、斗杆、铲斗、摇杆、连杆及包含动臂油缸、斗杆油缸、铲斗油缸在内的工作装置液压管路等主要部分组成。

动力传输路线表
1.行走动力传输路线：柴油机—联轴节—液压泵（机械能转化为液压能）—分配阀—中央回转接头—行走马达（液压能转化为机械能）—减速箱—驱动轮—轨链履带—实现行走2回转运动传输路线：柴油机—联轴节—液压泵（机械能转化为液压能）—分配阀—回转马达（液压能转化为机械能）—减速箱—回转支承—实现回转3动臂运动传输路线：柴油机—联轴节—液压泵（机械能转化为液压能）—分配阀—动臂油缸（液压能转化为机械能）—实现动臂运动4斗杆运动传输路线：柴油机—联轴节—液压泵（机械能转化为液压能）—分配阀—斗杆油缸（液压能转化为机械能）—实现斗杆运动5铲斗运动传输路线：柴油机—联轴节—液压泵（机械能转化为液压能）—分配阀—铲斗油缸（液压能转化为机械能）—实现铲斗运动
动力系统的构成及功能
·进气系统——网罩→胶管→空滤→胶管→增压器→胶管→中冷器→胶管→发动机 ·排气系统——增压器→膨胀节→消声器→排气管 ·冷却系统——水箱→胶管→节温器→水泵→柴油机→胶管→水箱 ·油门控制系统——步进电机→减速机→蜗轮蜗杆传动→油门拉线→柴油机油门—高怠速、低怠速限位开关 ·燃油系统进油系：燃油箱→胶管→手油泵→粗滤器→精滤器→柴油机回油系：柴油机→胶管→燃油箱 （回油量比较大，用它来进行部份冷却）