4WRL25EZ350S-3X/G24Z4/M比例换向阀

4WRL25EZ350S-3X/G24Z4/M比例换向阀由上海韦米机电设备有限公司专业提供

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4WRL25EZ350S-3X/G24Z4/M比例换向阀

换向阀分类

(1)机动换向阀，机动换向阀又称行程阀。

(2)电磁换向阀，电磁换向阀是利用电磁吸引力操纵阀芯换位的方向控制阀。

(3)电液换向阀，电液换向阀是由电磁换向阀和液动换向阀组成的复合阀。

(4)手动换向阀，手动换向阀是用手推杠杆操纵阀芯换位的方向控制阀。

 

优点

动作准确、自动化程度高、工作稳定可靠，但需附设驱动和冷却系统，结构较为复杂；阀瓣式结构则较简单，多用于流量较小的生产工艺上。

在石油、化工、矿山和冶金等行业中，六通换向阀是一种重要的流体换向设备。该阀安装在稀油润滑系统输送润滑油的管道中。通过变换密封组件在阀体中的相对位置，使阀体各通道连通或断开，从而控制流体的换向和启停。

 

换向阀是液压系统中必不可少的方向控制阀，其合理选择与应用是保证液压系统正常工作的关键。

合理选用三位换向阀的中位机能

三位换向阀中位机能要与液控单向阀匹配

液控单向阀因其良好的单向密封性而广泛应用于平衡、保压、锁紧等回路中，为了保证液控单向阀能够良好地锁定，一般采用H型或Y型中位机能的三位换向阀和液控单向阀配合使用。但现场上常出现0型或M型机能换向阀的情况，其锁定性能当然不会很好。

选用卸荷式中位机能电液换向阀要考虑控制压力的建立

电液换向阀由电磁换向阀和液动换向阀组成，其中电磁换向阀起先导作用，即用来改变液动换向阀控制压力油的方向;液动换向阀作为主阀，其工作位置由电磁换向阀的工作位置相应确定。电液换向阀根据控制油和回油方式分为:内控内泄式、内控外泄式、外控内泄式、外控外泄式四种。对于外控式阀，由于控制油是从电液换向阀之外的油路单独引入的，在使用时，无论内泄还是外泄，均不存在什么问题。对以内控方式供油的电液动换向阀，由于先导阀的供液口与主阀的P口是沟通的，若在中间位置是使泵卸荷的状态，如M、H、K等中位机能，在中位时主油路不能为控制油路提供主阀芯换向所必须的控制压力，因此不宜采取这种具有中位卸荷机能的内控式电液换向阀。如果要采取这种形式，在应用时一定注意配以预控压力阀，使在卸荷状态仍然具有一定的控制油压,足以操纵主阀芯换向，否则不能正常工作，即先导阀换向而主阀不能换向。

比例控制阀

采用比例电磁铁(或力矩马达)将输入信号转换成力或阀的机械位移，使阀的输出(压力、流量)也按照其输入量连续、成比例地进行控制的阀。

大型钢厂现场使用的比例阀主要有下表中的几种:伺服比例控制阀、比例控制阀、电液比例控制阀，比例阀，伺服阀。

4WRL25EZ350S-3X/G24Z4/M比例换向阀

 功能、组成部分： 阀芯机能 E. 和 W.

4WRLE 型比例阀是一个带电气位置反馈和集成电子元件 (OBE)

的先导式比例方向控制阀。

装配

阀的基本构成包括 3 个主要组件：

? 先导控制阀 (1) 包含控制阀芯和套筒、复位弹簧、控制线圈

和感应式位置传感器（可选配电子元件保护膜 (5) 和减振板

(4)）

? 带对中弹簧和位置反馈的主阀 (2)

? 带模拟量 (6) 或 IO-Link 接口的集成电子元件 (OBE) (3)

功能

当集成电子元件 (OBE) 处于被关闭或未激活的状态时，先导控

制阀的控制阀芯在弹簧作用下处于 "故障安全" 位置。主阀的控

制阀芯位于其弹簧对中中心位置。

集成电子元件 (OBE) 将****控制值与主阀控制阀芯的位置实际

值进行比较。在有控制偏差的情况下，将激活控制线圈。由于磁

力发生改变，先导控制阀芯进行调节以抵住弹簧。

通过改变控制截面大小而产生的流量可以对主控制阀芯进行调

节。主控制阀芯的行程/控制截面与控制值成比例进行调节。

先导油可通过油口 P 从内部供给先导控制阀，也可通过油口 X

从外部供给先导控制阀。可通过油口 T 从内部实现到油箱的反

馈，也可以通过油口 Y 从外部实现。

控制线圈切断

在以下故障情况下，集成电子元件 (OBE) 使控制线圈断电，先

导控制阀芯将设置为 "故障安全" 位置，并将卸载主阀的先导油

腔。通过弹簧操作，主阀控制阀芯将移动至中心位置。

? 低于较小电源电压

? 仅在当接口为 "F1" 时：

– 值低于较小电流控制值 2 mA（包括控制值线的电缆中断

（电流环））。

? 仅当接口为 "L1" 时：

– 使能未激活，通讯中断（看门狗）

– 内部 IO-Link 发生故障时

? 仅当接口为 "C6" 时：

– 额外的，释放未激活

减振板 "D"

减振板 (4) 降低集成电子元件上的加速振幅（频率 >300 Hz）。

注意：

对于主要为低激励频率 (<300 Hz) 的应用，不建议使用减振

板。

4WRL25EZ350S-3X/G24Z4/M比例换向阀供应型号

力士乐REXROTH高响应换向阀，先导式

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力士乐REXROTH三位四通高响应换向阀、先导式、电气位置反馈和集成电子放大版（OBE）4WRLE

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R901404812 4WRLE27E1-600LJ-4X/MXY/24A1

R901396320 4WRLE27E600LJ-4X/MXY/24A1

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R901439962 4WRLE35E1500LJ-4X/MXY/24A1-905

力士乐REXROTH三位四通高响应换向阀、先导式、电气位置反馈和集成电子放大版（OBE）4WRLE.V

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比例阀的工作原理如下：在不制动时,活塞在感载弹簧通过杠杆施加的推力F的作用下,处 于左端较限位置,这时阀门离开阀座打开,使输入输出油路相通。当开始制动时,来自助力器的压力为P1的制动液由进油口进入,并通过阀门从出油口输至后制动管路.此时输出液压P,等于输入液压P1当制动踏板力加大时,P1和P2同步加大。但由于活塞左侧承压面积大于右侧,致使活塞左侧受到的力也大于右侧.