力士乐比例阀4WRTE25E220L-4X/6EG24K31/A1M   REXROTH力士乐换向阀，REXROTH力士乐电磁阀 由上海韦米机电设备有限公司专业提供

换向阀是具有两种以上流动形式和两个以上油口的方向控制阀。是实现液压油流的沟通、切断和换向，以及压力卸载和顺序动作控制的阀门。
可分为手动换向阀、电磁换向阀、电液换向阀等。
又称克里斯阀，阀门的一种，具有多向可调的通道，可适时改变流体流向。
工作时借着阀外的驱动传动机构转动驱动轴，带动摇拐臂，启动阀板，使工作流体时而从左入口通向阀的下部出口，时而从右入口变换通向下部出口，实现了周期变换流向的目的。
这种变换阀在石油、化工生产中有着广泛的应用，在合成氨造气系统中最为常用。此外，换向阀还可作成阀瓣式的结构，多用于较小流量的场合。工作时只需转动手轮通过阀瓣来变换工作流体的流向。

比例阀 阀对流量的控制可以分为两种：
一种是开关控制：要么全开、要么全关，流量要么、要么小，没有中间状态，如普通的电磁直通阀、电磁换向阀、电液换向阀。
另一种是连续控制：阀口可以根据需要打开任意一个开度，由此控制通过流量的大小，这类阀有手动控制的，如节流阀，也有电控的，如比例阀、伺服阀。
所以使用比例阀或伺服阀的目的就是：以电控方式实现对流量的节流控制（当然经过结构上的改动也可实现压力控制等），既然是节流控制，就必然有能量损失，伺服阀和其它阀不同的是，它的能量损失更大一些，因为它需要一定的流量来维持前置级控制油路的工作。

上海韦米机电设备有限公司主营产品:
液压元件：柱塞泵、叶片泵、齿轮泵、马达、截止阀、方向阀、减压阀、流量控制阀、比例阀、伺服阀、插装阀、电液换向阀、电磁阀、电磁球阀、蓄能器、放大版、压力继电器、压力传感器。
气动元件:：气动阀、阀岛、阀组、电磁阀、换向阀、压力调节阀、流量控制阀,止回阀、气缸和驱动装置、压缩空气气源处理单元、真空技术、传感器、气动连接技术,电气连接技术。
电控伺服:：伺服驱动器,伺服电机、PLC模块、I/O模块、框架模块、电源模块、数据接口模块、键相位模块、继电器模块、测速模块、温度模块、显示屏、传感器、探头、前置器、延伸电缆。

以下是本公司常用德国博世REXROTH力士乐旗下产品的部分型号：

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）4WRTE
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