液压泵是液压系统的动力元件，其功用是给液压系统提供压力油，从能量转换角度讲，它将是原动机（如发动机）输出的机械能转换为便于输送的液体的压力能。液压马达则属于执行元件，它能将输入液体的压力能转换为输出轴转动的机械能，用来拖动负载做功。根据结构形式，液压泵与液压马达具体可分为齿轮式、叶片式、柱塞式等类型。
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1.液压泵压力
液压泵工作压力是指泵（或马达）在实际工作时输出（或输入）油液的压力，由外负载决定。
额定压力是指在正常工作条件下，按试验标准规定能连续运转的高压力。其大小受寿命的限制，若超过额定压力工作，泵（或马达）的使用寿命将会比设计的寿命短。当工作压力大于额定压力时称超载。
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2.转速
工作转速是指泵（或马达）在工作时的实际转动速度。
额定转速是指在额定压力下，能连续长时间正常运转的高转速。若泵超过额定转速工作将会造成吸油不足，产生振动和大的噪声，零件会遭受气蚀损伤，寿命降低。
低稳定转速是指马达正常运转所允许的低转速。在此转速下，马达不出现爬行现象。
3.排量、流量
排量是指泵（或马达）每转一周，由密封容腔几何尺寸变化而得的排出（或输入）液体的体积，常用单位是ml/r（毫升/转）。排量可以通过调节发生变化的成为变量泵（或变量马达），排量不能变化的成为定量泵（或定量马达）。
实际流量是指泵（或马达）工作时出口处（或进口处）的流量。由于泵本身存在内泄漏，其实际流量小于理论流量。由于马达本身也存在内泄漏，要实现使用转速，为补偿泄漏量，其输入实际流量大于理论流量。
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4.效率
容积效率，对液压泵是指其实际流量与理论流量的比值。对液压马达是指其理论流量与实际流量的比值。
机械效率，对液压泵是指其理论转矩与实际输入转矩的比值。对液压马达其实际输出的转矩为理论转矩克服摩擦力后的转矩，因此其机械效率为实际输出转矩与理论转矩的比值。
总效率是指泵（或马达）的输出功率与输入功率的比值。总效率等于容积效率与机械效率的乘积。
叶片泵安装要求
1.泵转向改变，则其吸排方向也改变叶片泵都有规定的转向，不允许反。因为转子叶槽有倾斜，叶片有倒角，叶片底部与排油腔通，配油盘上的节流槽和吸、排口是按既定转向设计。可逆转的叶片泵专门设计。
2.叶片泵装配配油盘与定子用定位销正确定位，叶片、转子、配油盘都不得装反，定子内表面吸入区部分易磨损，必要时可将其翻转安装，以使原吸入区变为排出区而继续使用。
3.拆装 注意工作表面清洁，工作时油液应很好过滤。
4. 叶片在叶槽中的间隙太大会使漏泄增加，太小则叶片不能自由伸缩，会导致工作失常。
5.叶片泵的轴向间隙 对ηv影响很大。
1)小型泵-0.015～0.03mm
2)中型泵-0.02～0.045mm
6.油液的温度和粘度 一般不宜超过55℃，粘度要求在17～37mm2/s之间。粘度太大则吸油困难;粘度太小则漏泄严重。
叶片泵
PV7…A型直接控制变量叶片泵；
PV7…A型液压泵是直接控制（手动）的变量叶片泵。
公称规格10到25，1X/2X系列；工作压力100bar；
规格排量：10/14/20/25，流量；14.5/20/29/36L/min；
机型规格BG06/06/20/20-公称规格NS10/14/20/25等于规格10/14/20/25；
PV7…A型直接控制变量叶片泵：在工作时拥有很短的控制时间，运行时候噪声低，泵的装配和连接尺寸符合VDMA 24 560/1和ISO 3019/2标准；
PV7叶片泵拥有的工作效率，工作时效率高，可以长时间使用的寿命长，是一个可变排量泵；
PV7…A直接控制叶片泵：PV7…A型带1X系列BS 06（10到29），和2X系列BS 20（20到29）；
PV7…A型叶片泵用于两种BG和NS型机型规格与公称规格；
06-10/06-14/20-20/20-25；
泵从轴端看所适用的旋转方向是向右R顺时针，两种驱动轴A圆柱形驱动轴和E圆柱形驱动轴带通轴驱动；油管连接01是进，出油的连接；
叶片泵的密封元件用于NBR密封M，和FKM轴封K密封；
三种泵的调节元件：0调节螺钉标准型，3的一次带可断的可锁旋钮，3带锁的控制器；
PV7型变量叶片泵多种零排量压力范围：05/10/04/07/02/05/10/；
变量叶片泵PV7…A型直接控制：泵主要是由泵体，端盖，转子，叶片，定子环，压缩弹簧，调节螺钉和配油盘等组成。
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