4WRA10W30-22/G24N9K4/V力士乐比例阀

液压系统的组成及其作用

一个完整的液压系统由五个部分组成，即动力元件、执行元件、控制元件、辅助元件（附件）和液压油。

动力元件的作用是将原动机的机械能转换成液体的压力能，指液压系统中的油泵，它向整个液压系统提供动力。液压泵的结构形式一般有齿轮泵、叶片泵和柱塞泵。

执行元件(如液压缸和液压马达)的作用是将液体的压力能转换为机械能，驱动负载作直线往复运动或回转运动。

控制元件(即各种液压阀)在液压系统中控制和调节液体的压力、流量和方向。根据控制功能的不同，液压阀可分为村力控制阀、流量控制阀和方向控制阀。压力控制阀又分为益流阀(安全阀)、减压阀、顺序阀、压力继电器等；流量控制阀包括节流阀、调整阀、分流集流阀等；方向控制阀包括单向阀、液控单向阀、梭阀、换向阀等。根据控制方式不同，液压阀可分为开关式控制阀、定值控制阀和比例控制阀。

辅助元件包括油箱、滤油器、油管及管接头、密封圈、快换接头、高压球阀、胶管总成、测压接头、压力表、油位油温计等。

液压油是液压系统中传递能量的工作介质，有各种矿物油、乳化液和合成型液压油等几大类。

比例阀按功能分为三大类

(1)比例压力阀。有溢流阀减压阀,分别有直动和先导两种结构;可连续地或按比例地远程控制其输出油液压力;

(2)比例换向阀。有直动和先导两种结构,直动阀有带位移传感器和不带位移传感器两类。由于使用了比例电磁铁阀芯不仅可以换位，而且换位的行程可以连续地或按比例地变化。因而连通油口间的通流面积也可以连续或按比例地变化。所以比例换向阀不仅能够控制执行元件的方向而且能够控制其速度。因为这个原因比例阀中的比例换向阀应用也为普遍;

(3)比例流量阀。有比例调速阀和比例溢流流量控制阀,可连续地或按比例地远程控制其输出流量。

比例阀的输入单元是电-机械转换器,它将输入的电信号转换成机械量转换器有伺服电机和步进电机力马达和力矩马达比例电磁铁等形式。但常用的比例阀大都采用了比例电磁铁，比例电磁铁根据电磁原理设计,能使其产生的机械量(力或力矩和位移)与输入电信号(电流)的大小成比例,再连续地控制液压阀阀芯的位置，进而实现连续地控制液压系统的压力方向和流量。比例电磁铁的结构，它由线圈、衔铁推杆等组成,当有信号输入线圈时,线圈内磁场对衔铁产生作用力,衔铁在磁场中按信号电流的大小和方向成比例连续地运动,再通过固连在一起的销钉带动推杆运动,从而控制滑阀阀芯的运动。应用广泛的比例电磁铁是耐高压直流比例电磁铁。

4WRA10W30-22/G24N9K4/V力士乐比例阀

4WRA产品说明

在阀板设计中两位四通及三位四通比例方向阀用作直动式设备。通过带对中螺纹和可拆卸线圈的比例电磁铁进行操作。线圈由外部控制电子元件进行控制。

设置：

阀门的基本构成包括：

带连接面的壳体 (1)

带有压缩弹簧（3 和 4）的控制阀芯 (2)

带对中螺纹的线圈（5 和 6）

功能：

线圈（5 和 6）断电后，通过压缩弹簧（3 和 4）使控制阀芯 (2) 保持在中心位置

通过为比例电磁铁通电直接对控制阀芯 (2) 进行操作，例如控制线圈“b”(6)

将控制阀芯 (2) 与电气输入信号成比例地向左移动

通过具有渐进流体特性的节流横截面，进行从 P 到 A 及从 B 到 T 的连接

关闭线圈 (6)

控制阀芯 (2) 在压缩弹簧 (3) 的作用下返回到中心位置

带两个阀芯位置的阀门（型号 4WRA...A...）：

基本上，此型号阀的功能与带三个阀芯位置的阀门功能相对应。但是，此双阀芯位置阀仅配有线圈“a”。它配有带 NG 6 的保护塞 (8.1) 或带 NG10 的盖 (8.2) 来代替第二个比例电磁铁。

注意：

不得让油箱管路排空运行。在相应的安装条件下，必须安装一个预载阀（预载压力约为 2 bar）。

4WRA10W30-22/G24N9K4/V力士乐比例阀供应型号

力士乐REXROTH比例方向阀，直动式

力士乐REXROTH二位四通和三位四通比例方向阀直控式，阀芯不带位移电反馈，不带集成式放大版（OBE）4WRA

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R900935535 4WRA6WA30-2X/G24K4/V

R900244238 4WRA6WA30-2X/G24N9K4/V

R900947417 4WRA6WA30-2X/G24N9K4/V-589

R900901914 4WRA6WA30-2X/G24Z4/V

R900761800 4WRA6WB03-2X/G24N9K4/V-589

R901000767 4WRA6WB07-2X/G24K4/V

R901040903 4WRA6WB07-2X/G24N9K4/V

R901206173 4WRA6WB07-2X/G24N9K4/V-589

R901055110 4WRA6WB15-2X/G24K4/V

R901266770 4WRA6WB15-2X/G24K4/V-589

R901017934 4WRA6WB30-2X/G24K4/V

R978017292 4WRA6X30-2X/EG..N9..SO43A-1800

R978919010 4WRA6X30-2X/G24N9K4/V-874

R978916415 4WRA10EA30-2X/G24N9K4/VSO43A-1681

R978009437 4WRA10W1-60-2X/G24N9K4/VSO43A-1779

R902650718 DIR.-CO****OLVALVE 4WRA6E07-2X/G24NJK&

R902650387 DIR.-CO****OLVALVE 4WRA6E30-2X/G24N9K&

R902416026 DIR.-CO****OLVALVE 4WRA6E30-2X/G24N9Z&

R910988077 DIR.-CO****OLVALVE 4WRA6V15-2X/G24N9K&

R910991712 DIR.-CO****OLVALVE 4WRA6V30-2X/G24N9K&

R910988078 DIR.-CO****OLVALVE 4WRA10V30-2X/G24N9K4&

R910988165 DIR.-CO****OLVALVE 4WRA10V30-2X/G24N9Z4&

R902435562 DIR.-CO****OLVALVE 4WRA6EO7-2X/G24NJK31&

力士乐REXROTH二位四通和三位四通比例方向阀直控式，阀芯不带位移电反馈，带集成式放大版（OBE）4WRAE

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R900954409 4WRAE10E1-60-2X/G24K31/A1V

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R901038922 4WRAE10E60-2X/G24N9K31/A1V-280

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R901416065 4WRAE10W60-2X/G24N9K31/A1M

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R900974924 4WRAE10W60-2X/G24N9K31/A1V-280

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R900935370 4WRAE6V30-2X/G24N9K31/A1V

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R900736894 4WRAE6W03-2X/G24N9K31/A1V

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R900914844 4WRAE6W30-2X/G24N9Z31/A1V-612

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R901239200 4WRAE6WB15-2X/G24N9K31/F1V

R900941851 4WRAE6WB30-2X/G24N9K31/A1V

力士乐REXROTH比例方向阀，直控式4WRA ...XE

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R901097419 4WRA6E15-2X/G24XEJ/V

R901154863 4WRA6E30-2X/G24XEJ/V

R901254509 4WRA6EA03-2X/G24XEJ/V

R901262600 4WRA6EA07-2X/G24XEJ/V

R901393419 4WRA6EA15-2X/G24XEJ/V

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R901061252 4WRA6W07-2X/G24XEJ/V

R901368290 4WRA6W1-07-2X/G24XEJ/V

R901066698 4WRA6W1-15-2X/G24XEJ/V

R901028052 4WRA6W1-30-2X/G24XEJ/V

R901177023 4WRA6W15-2X/G24XEJ/V

R901053397 4WRA6W30-2X/G24XEJ/V

R901123241 4WRA6WA30-2X/G24XEJ/V

力士乐REXROTH二位四通和三位四通比例方向阀直控式，阀芯带位移电反馈，不带集成式放大版（OBE）4WRE

安全阀是启闭件受外力作用下处于常闭状态，当设备或管道内的介质压力升高超过规定值时，通过向系统外排放介质来防止管道或设备内介质压力超过规定数值的特殊阀门。安全阀属于自动阀类，主要用于锅炉、压力容器和管道上，控制压力不超过规定值，对人身安全和设备运行起重要保护作用。注安全阀必须经过压力试验才能使用。