液压系统的作用为通过改变压强增大作用力。一个完整的液压系统由五个部分组成，即动力元件、执行元件、控制元件、辅助元件（附件）和液压油。一个液压系统的好坏取决于系统设计的合理性、系统元件性能的的优劣，系统的污染防护和处理，而Z后一点尤为重要。近年来我国国内液压技术有很大的提高，不再单纯地使用国外的液压技术进行加工。
一个完整的液压系统由五个部分组成，即动力元件、执行元件、控制元件、辅助元件（附件）和液压油。 动力元件的作用是将原动机的机械能转换成液体的压力能，指液压系统中的油泵，它向整个液压系统提供动力。液压泵的结构形式一般有齿轮泵、叶片泵和柱塞泵。 执行元件(如液压缸和液压马达)的作用是将液体的压力能转换为机械能，驱动负载作直线往复运动或回转运动。 控制元件(即各种液压阀)在液压系统中控制和调节液体的压力、流量和方向。根据控制功能的不同，液压阀可分为压力控制阀、流量控制阀和方向控制阀。压力控制阀又分为益流阀(安全阀)、减压阀、顺序阀、压力继电器等；流量控制阀包括节流阀、调整阀、分流集流阀等；方向控制阀包括单向阀、液控单向阀、梭阀、换向阀等。根据控制方式不同，液压阀可分为开关式控制阀、定值控制阀和比例控制阀。 辅助元件包括油箱、滤油器、油管及管接头、密封圈、快换接头、高压球阀、胶管总成、测压接头、压力表、油位油温计等。 液压油是液压系统中传递能量的工作介质，有各种矿物油、乳化液和合成型液压油等几大类。The role of the hydraulic system to increase the force by changing the pressure. A complete hydraulic system consists of five parts， namely， power components， the implementation of components， control components， auxiliary components (Annex) and the hydraulic oil. A hydraulic system is good or bad depends on the system design is reasonable， the merits of the performance system components， system， pollution prevention and treatment， while the last point is particularly important. In recent years， China's domestic hydraulic technology has greatly improved， not simply using hydraulic technology from abroad for processing.A complete hydraulic system consists of five parts， namely， power components， the implementation of components， control components， auxiliary components (Annex) and the hydraulic oil. The role of dynamic components is the original motivation of the mechanical energy into fluid pressure energy， the hydraulic system of pumps， which provide power to the entire hydraulic system. Structure of hydraulic pumps generally have gear pumps， vane pumps and piston pumps.Implementation of components (such as hydraulic cylinders and hydraulic motors) is to pressure the liquid can be converted to mechanical energy to drive the load for a linear reciprocating movement or rotational movement. Control components (ie all kinds of hydraulic valves) in the hydraulic system control and regulation of fluid pressure， flow and direction. According to the different control functions， hydraulic valves can be divided into pressure control valves， flow control valves and directional control valve. Pressure control valve is divided into benefits flow valve (safety valve)， pressure relief valve， sequence valve， pressure switch， etc.; flow control valves including throttle， adjusting valves， flow diversion valve assembly;Directional control valve includes a check valve， check valve， shuttle valve， valve and so on. Under the control of different ways， hydraulic valves can be divided into switching control valves， control valves and the fixed value proportional control valve.Auxiliary components， including fuel tanks， filters， tubing and pipe joints， seals， quick couplings， high pressure ball valve， hose assembly， pressure fittings， pressure gauge， oil level， oil temperature meter and so on. Hydraulic system of hydraulic oil is the work of the energy transfer medium， a variety of mineral oil， emulsion， oil hydraulic molding Hop categories.
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