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单向阀、液控单向阀、SV/SL型液控单向阀、Z2S叠加式液控单向阀

1.结构和工作原理

单向阀又称止回阀或逆止阀。用于液压系统中防止油流反向流动。单向阀有直通式和直角式两种。

SV和SL型液控单向阀都是座式阀，由液压开启，能给出反向流。

这种阀用来隔离局部压力回路，即作为在管子破裂时防止负载降落的保护，也可防止负载下爬。这种液控单向阀主要包括阀体、主阀、先导阀、压缩弹簧和控制活塞 。

SV型阀(无泄油口)一一泄漏油内部回油

由A口至B口始终可以流动。反方向上则导阀和主阀被压缩弹簧和系统压力保持在阀座上。若X口供给压力油则控制活塞被推向右。

这首先打开导阀，然后打开主阀。于是油液先通过导阀，然后通过主

导阀。为了保证用控制活塞能可靠地操纵，需要一定的控制压力。

SL型阀(带泄油口)-一-泄漏油外部回油

在原理上，此阀与SV型有相同的功能。不同之处在于增加了泄油口Y,这就可使控制活的环形面积与A口隔离。A口来的油压只作用在控制活塞的面积A4上，从而有效地降低此条件下所需的控制压力。

Z2S型叠加式液控单向阀

Z2S型单向阀是叠加式液控单向阀。它可用于关闭一个或两个工作油口，无泄漏持续时间长，稳定性好。

油液从A到A1或B到B1自由流通，反向则被截止。如果油流通过阀，例如从A到A1，压力油作用在阀芯上，阀芯则向右运动并推动钢球离开阀座。单向阀被控制油打开时，油可从B1到B流通。压力在B1腔卸荷，单向阀全部开启。为保证两个主单向阀在换向阀中位时能可靠的关闭，阀的A、B口与回油路连接。

2.单向阀的主要故障

单向阀可能出现的最主要的故障，是当油液从P2腔反向进入时，锥阀芯(或钢球)不能将油液严格封闭而产生渗漏。这种渗漏现象更容易出现在反向流油的压力比较低的情况。这时需要检查阀芯锥面(或钢球)与阀座的接触是否紧密;或检查阀座孔与阀芯孔是否保证所需要的同轴度要求，或者当阀座压入阀体孔时有没有压歪。如不符合要求，则需将阀芯锥面(或钢球)与阀座重新配研，或者将阀座拆出重新压装，直到与阀芯锥面(或钢球)严密接触为止。

另外单向阀的阀座或阀套与阀体间的密封装配或拆装时挤伤，而造成内部泄漏。

如果单向阀启闭不灵活，这种阀芯有卡阻现象，则需检查阀体孔与阀芯的加工几何精度，以及二者的配合间隙是否符合要求。这种现象有可能出现于正向开启压力很小的单向阀，或者这种开启压力很小的单向阀是阀芯轴线沿水平方向安装使用时的场合;另外，也应检查弹簧是否断裂或者过分弯曲而引起卡阻。这里应该注意的是，不论是直通型单向阀还是直角型单向阀，都不允许阀芯锥面向上安装。

液控单向阀是方向控制阀中的一种。具体分类：

方向控制阀按其在液压系统中的功能分为单向阀和换向阀两大类。

单向阀在液压传动中有普通单向阀和液控单向阀。

(1)保持压力。

滑阀式换向阀都有间隙泄漏现象，只能短时间保压。当有保压要求时，可在油路上加一个液控单向阀，利用锥阀关闭的严密性，使油路长时间保压。

(2)液压缸的“支承"。

在立式液压缸中，由于滑阀和管的泄漏，在活塞和活塞杆的重力下，可能引起活塞和活塞杆下滑。将液控单向阀接于液压缸下腔的油路，则可防止液压缸活塞和滑块等活动部分下滑。

(3)实现液压缸锁紧。

当换向阀处于中位时，两个液控单向阀关闭，可严密封闭液压缸两腔的油液，这时活塞就不能因外力作用而产生移动。

(4)大流量排油。

液压缸两腔的有效工作面积相差很大。在活塞退回时，液压缸右腔排油量骤然增大，此时若采用小流量的滑阀，会产生节流作用，限制活塞的后退速度；若加设液控单向阀，在液压缸活塞后退时，控制压力油将液控单向阀打开，便可以顺利地将右腔油液排出。

(5)作充油阀。

立式液压缸的活塞在高速下降过程中，因高压油和自重的作用，致使下降迅速，产生吸空和负压，必须增设补油装置。液控单向阀作为充油阀使用，以完成补油功能。

(6)组合成换向阀。

在设计液压回路时，有时可将液控单向阀组合成换向阀使用。例如：用两个液控单向阀和一个单向阀并联（单向阀居中），则相当于一个三位三通换向阀的换向回路。需要指出，控制压力油油口不工作时，应使其通回油箱，否则控制活塞难以复位，单向阀反向不能截止液流。

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力士乐REXROTH单向阀，先导式Z2S 32

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力士乐液控单向阀SV 10 32

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R978901569 SV30PA1-4X/SO43A-1477

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力士乐REXROTH液控单向阀SL 6

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力士乐REXROTH液控单向阀SL 10 32

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液压系统主要由5个部分组成，泵、阀、油缸、马达为核心元件。典型的液压系统由动力元件（主要是液压泵）、控制元件（主要是液压阀）、执行元件（包括液压油缸、液压马达）、辅助元件（包括油箱、过滤器、蓄能器、热交换器）、工作介质（包括矿物油、乳化液、液压油等）5个部分组成，其中泵、阀、油缸、马达的技术难度大、产品附加值高、价值占比较高，是液压系统的核心元件。

液压泵：主要有柱塞泵、齿轮泵、叶片泵和螺杆泵。其中，柱塞泵、叶片泵属于高压泵，齿轮泵属于低压泵。以柱塞泵为例，其密封工作腔构件为圆柱形的柱塞和缸体，容易得到较高的配合精度，特点是泄漏量小，容积效率高，可以在高压下工作；由于柱塞泵压力高、结构紧凑、效率高、流量调节方便，故在需要高压、大流量、大功率的系统中和流量需要调节的场合，如工程机械、矿山冶金机械、船舶、重型刨床及液压机等设备上广泛应用。

液压阀：主要分为方向阀、流量阀、压力阀。方向阀用于控制系统中的油流方向，包括换向阀、单向阀等；流量控制阀，用于控制液压系统中油的流量，包括节流阀、调速阀等；压力控制阀，用于控制系统中的油压，包括溢流阀、减压阀、顺序阀等；上述三类阀可组成各种复合阀。

液压油缸：液压缸由缸体、可移动的活塞和连接活塞的活塞杆组成，缸体两端用端盖进行封闭，端盖可采用螺纹、卡圈、拉杆或焊接等方式与缸体连接；分为双作用式、单作用式、伸缩式。

液压马达：分为单向、双向液压马达，也分为定量马达与变量马达。

液控单向阀是依靠控制流体压力，可以使单向阀反向流通的阀。这种阀在煤矿机械的液压支护设备中占有较重要的地位。液控单向阀与普通单向阀不同之处是多了一个控制油路K，当控制油路未接通压力油液时，液控单向阀就象普通单向阀一样工作，压力油只从进油口流向出油口，不能反向流动。当控制油路油控制压力输入时，活塞顶杆在压力油作用下向右移动，用顶杆顶开单向阀，使进出油口接通。若出油口大于进油口就能使油液反向流动。

结构与工作原理:

锥阀结构的液控单向阀，它可以由液压开启而允许油液在闭锁方向自由流通。

此类阀用于有液压回路部分的隔离，以避免管路破裂时负载失压，或避免执行器在液压闭锁时因滑阀泄漏引起的爬行或漂移。

该阀的组成主要包括阀体(1) 、阀芯(2)、压缩弹簧(3)和控制活塞(4)

液控单向阀

基本功能:

可以由液压开启而允许反向流动，用来隔离局部压力回路，即作为在管子破裂时防止负载降落的保护，也可防止负载下爬。