4WRBA10EA75-2X/G24K4/M-828液压比例控制阀由上海韦米机电设备有限公司有经验提供

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4WRBA10EA75-2X/G24K4/M-828液压比例控制阀

液压比例控制系统

以比例控制元件完成动力与运动方向控制，分为比例压力阀、比例流量阀、比例方向阀及比例方向流量阀，可为模拟量输入或数字量输入，视是否带反馈分为开环控制与闭环控制，一般获得频率不是很高(10HZ)以内，高频响阀可实现较高频率。

若精度要求不高可考虑使用电液比例控制系统，一般电液比例控制系统可达至以下精度

位置精度- 3 mm

速度精度带压力补偿器- 3%

加减速斜坡时间-0.5秒

压力带位移传感器的产品-比例压力阀设定的0.3% (如压力设定为200bar,精度可达0.6bar)

一般的多驱动器液压系统皆要求流量及压力控制，提供比例压力及流量控制系统

开环式比例压力及流量控制可用于定量泵及变量泵系统。

速度和流量比例控制的分别是:

流量控制只控制供油量,并不控制驱动元件的运动方向;

若系统负载及变速要求高，则要使用速度控制系统。

速度比例控制多用于自动化控制、注塑机、压力机等

电液比例阀是比例控制系统中的主要功率放大元件,按输入电信号指令连续地成比例地控制液压系统的压办流量等参数。与伺 服控制系统中的伺服阀相比,在某些方面还有一-定的性能差距(主要性能比较如表1所示),但它显著的优点是抗污染能力强,大大地减少了由污染而造成的工作故障,提高了液压系统的工作稳定性和可靠性。另一方面比例阀的成本比伺服阀低，结构也简单,已在许多场合获得广泛应用。

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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液压阀的作用

液压阀是用来控制液压系统中油液的压力、流量和液体流动方向。

二、液压阀的分类

按功能分:

方向控制阀(单向阀、换向阀)

压力控制阀(溢流阀、减压阀、顺序阀、压力继电器)

流量控制阀(节流阀、调速阀)

按操纵方式分:

手动和脚踏、机动、电动、液动、电液动等。

共同点

(1) 在结构上，所有的阀都有阀体、阀芯(转阀或滑阀)和驱使阀芯动作的部件(如弹簧、电磁铁)组成。

(2)在工作原理上，所有阀的开口大小，阀进、出口压差以及流过阀的流量之间的关系都符合孔口流量公式，仅是各种阀控制的参数各不相同而已。

三、对液压阀的基本要求

(1)动作灵敏，使用可靠，工作时冲击和振动小。

(2)油液流过的压力损失小。

(3)密封性能好。

(4)结构紧凑，安装、调整、使用、维护方便，通用性大。

方向控制阀

类型:单向阀、换向阀

一、单向阀

类型:普通单向阀、液控单向阀

1、普通单向阀

作用:只允许油液沿一个方向流动，不允许油液反向倒流(起止回作用)

对单向阀的性能要求:

(1) 正向导通时，压力损失要小;

(2)反向截止时，密封性要好。

2、

液控单向阀

作用:

(1)起止回作用;

(2)必要时解除逆止，允许油液反向通过。

3、单向阀用途

(1)止回作用:安装在泵的出口，p.=0.3~0.5 bar

(2)作背压阀用:防止液压缸前冲或爬行，使系统作平稳。

(3)作锁紧装置用:起重机支腿、夹紧回路等。

(4)保持控制油路有必要的压力: Pr≥P液挖

(5)作复合阀使用:单向节流阀、单向顺序阀、单向减压阀、单向调速阀等。

(6)局部回路作安全阀使用: Ppr>P换热器正常工作的距力

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力士乐REXROTH比例方向阀，直控式4WRA ...XE

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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