【正文】 control valves including throttle, adjusting the valves, flow diversion valve sets, etc.。根據(jù)控制功能的不同，液壓閥可分為壓力控制閥、流量控制閥和方向控制閥。根據(jù)控制方式不同，液壓閥可分為開關(guān)式控制閥、定值控制閥和比例控制閥。 Hydraulic oil in the hydraulic system is the work of the energy transfer medium, there are a variety of mineral oil, emulsion oil hydraulic molding Hop categories. 液壓油是液壓系統(tǒng)中傳遞能量的工作介質(zhì)，有各種礦物油、乳化液和合成型液壓油等幾大類。主要是由執(zhí)行元件把壓力變成轉(zhuǎn)動或往復(fù)運動。 Part of the hydraulic power means that the circuit diagram used to show the different functions of the interrelationship between ponents. Containing the source of hydraulic pump, hydraulic motor and auxiliary ponents。 operative or hydraulic cylinder with hydraulic motors, according to the actual requirements of their choice. 液壓動力部分采用回路圖方式表示，以表明不同功能元件之間的相互關(guān)系。 In the analysis and design of the actual task, the general block diagram shows the actual operation of equi pment. Hollow arrow indicates the signal flow, while the solid arrows that energy flow. 在分析和設(shè)計實際任務(wù)時，一般采用方框圖顯示設(shè)備中實際運行狀況。 Basic hydraulic circuit of the action sequence Control ponents (two fourway valve) and the spring to reset for the implementation of ponents (doubleacting hydraulic cylinder), as well as the extending and retracting the relief valve opened and closed . For the implementation of ponents and control ponents, presentations are based on the corresponding circuit diagram symbols, it also introduced ready made circuit diagram symbols. 基本液壓回路中的動作順序 — 控制元件（二位四通換向閥）的換向和彈簧復(fù)位、執(zhí)行元件（雙作用液壓缸）的伸出和回縮以及溢流閥的開啟和關(guān)閉。 Working principle of the system, you can turn on all circuits to code. If the first implementation of ponents numbered 0, the control ponents associated with the identifier is 1. Out with the implementation of ponents corresponding to the identifier for 4 the even ponents, then retracting and implementation of ponents corresponding to the identifier for the odd ponents. Hydraulic circuit carried out not only to deal with numbers, but also to deal with the actual device ID, in order to detect system failures. 根據(jù)系統(tǒng)工作原理，您可對所有回路依次進(jìn)行編號。如果與執(zhí)行元件伸出相對應(yīng)的元件標(biāo)識符為偶數(shù)，則與執(zhí)行元件回縮相對應(yīng)的元件標(biāo)識符則為奇數(shù)。 DIN ISO12192 standard definition of the number of ponent position, which includes the following four parts: device ID, circuit ID, ponent ID and ponent ID. The entire system if only one device, device number may be omitted. DIN ISO12192 標(biāo)準(zhǔn)定義了元件的編號組成，其包括下面四個部分：設(shè)備編號、回路編號、元件標(biāo)識符和元件編號。 Practice, another way is to code all of the hydraulic system ponents for numbers at this time, ponents and ponent code should be consistent with the list of numbers. This method is particularly applicable to plex hydraulic control system, each control loop are the corresponding number with the system 實際中，另一種編號方式就是對液壓系統(tǒng)中所有元件進(jìn)行連續(xù)編號，此時，元件編號應(yīng)該與元件列表中編號相一致。 2, light weight, small size, small inertia, fast response. 重量輕、體積小、運動慣性小、反應(yīng)速度快。 4, to achieve overload protection automatically. 可自動實現(xiàn)過載保護(hù) 。 一般采用礦物油作為工作介質(zhì)，相對運動面可自行潤滑，使用壽命長； 6, it is easy to achieve linear motion / 很容易實現(xiàn)直線運動 / 7, it is easy to achieve the automation of machines, when the joint control of the use of electrohydraulic, not only can achieve a higher degree of process automation, and remote control can be achieved。 5 The shortings of the hydraulic system: 液壓系統(tǒng)的缺點： 1, as a result of the resistance to fluid flow and leakage of the larger, so less efficient. If not handled properly, leakage is not only contaminated sites, but also may cause fire and explosion. 由于流體流動的阻力和泄露較大，所以效率較低。 2, vulnerable performance as a result of the impact of temperature change, it would be inappropriate in the high or low temperature conditions. 由于工作性能易受到溫度變化的影響，因此不宜在很高或很低的溫度條件下工作。 4, due to the leakage of liquid medium and the pressibility and can not be strictly the transmission ratio. 由于液體介質(zhì)的泄露及可壓縮性影響，不能得到嚴(yán)格的傳動比。 the use and maintenance requirements for a higher level of technolo