SL20PA1-42力士乐液控单向阀

SL20PA1-42力士乐液控单向阀 德国进口博世力士乐REXROTH单向阀 液控单向阀

库存现货力士乐液压元件: 柱塞泵A10VSO、电磁阀4WE、电磁阀3WE、溢流阀DBW、DBDS、DB、3DR、节流阀Z2S、Z2F、叶片泵PV7、PVV、齿轮泵PH2,PH4,PGF、HM20/HM17压力传感器、压力继电器HED、博世放大器、放大板 、阀0811、0820 、齿轮泵0510、减压阀DR、ZDR、4WREE,马达伺服驱动 电机等系列产品

SL20PA1-42力士乐液控单向阀

型号SV和SL阀是锥阀结构的液控单向阀，它可在关闭方向开启而让油液自由流动。

此类阀用于有液压回路部分的隔离，当管路破裂时，作为防止负载失压的安全措施，或避免执行器在液压闭锁时的爬行或漂移。

其组成主要包括阀体、阀芯 、压缩弹簧和控制活塞和一个可选的释压球阀。

型号SV...

油液可以由A至B自由流动。在相反方向，阀芯被压缩弹簧和系统压力牢固的保持在其阀座上。

通过向控制口X提供压力，控制活塞被推向右侧。这样阀芯离开阀座，油液由B至A流动。

为了确保阀开启，需要一定的低控制压力作用于控制活塞上

为了确保通过施加到控制阀芯上压力阀能打开，要求一定的小先导压力

型号SV..A..和SL..A.. (带卸压功能，)

该阀有一个附加的印载机构，当向X口提供控制压力时，控制活塞被推向右侧。它首先推开球阀芯，然后主阀芯离开其阀座。这样，油液从B流向A,从而避免可能的压力冲击。

由于这种预开启特征，可以实现缸中受压液体的平稳释压。

型号SL..

此阀的功能与SV型相同。

不同之处在于增加了泄油口Y。此处控制活塞 的环形面积与A口隔离。来自A口的压力只作用于控制活塞 的面积A_上。

SL20PA1-42力士乐液控单向阀

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。当控制油路有控制压力输入时，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。

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。

单向阀主要特点

(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加大，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。

注意事项。

(1)必须保证液控单向阀有足够的控制压力，较好不允许控制压力失压。应注意控制压力是否满足反向开启的要求。如果液控单向阀的控制引自主系统时，则要分析主系统压力的变化对控制油路压力的影响，以免出现液控单向阀的误动作。

(2)根据液控单向阀在液压系统中的位置或反向出油腔后的液流阻力（背压）大小，合理选择液控单向阀的结构（简式或复式）及泄油方式（内泄或外泄）。对于内泄式液控单向阀来说，当反向油出口压力超过一定值时，液控部分将失去控制作用，故内泄式液控单向阀一般用于反向出油腔无背压或背压较小的场合；而外泄式液控单向阀可用于反向出油腔背压较高的场合，以降低较小的控制压力，节省控制功率。系统若采用内卸式，则柱塞缸将断续下降发出振动和噪声。

SL20PA1-42力士乐液控单向阀型号

力士乐液控单向阀SV 10...32

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力士乐REXROTH液控单向阀SL 6

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调节阀执行机构的选择

为了使调节阀正常工作，配用的执行机构要能产生足够的输出力来保证高度密封和阀门的开启。

对于双作用的气动、液动、电动执行机构，一般都没有复位弹簧。作用力的大小与它的运行方向无关，因此，选择执行机构的关键在于弄清较大的输出力和电机的转动力矩。对于单作用的气动执行机构，输出力与阀门的开度有关，调节阀上的出现的力也将影响运动特性，因此要求在整个调节阀的开度范围建立力平衡。

执行机构类型的确定

对执行机构输出力确定后，根据工艺使用环境要求，选择相应的执行机构。对于现场有防爆要求时，应选用气动执行机构。从节能方面考虑，应尽量选用电动执行机构。若调节精度高，可选择液动执行机构。如发电厂透平机的速度调节、炼油厂的催化装置反应器的温度调节控制等。