4WRAE10EA30-2X/G24N9K31/A1V德国原装力士乐比例阀

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液压元件（阀门、泵、油缸等），欢迎询价订货

      武汉耀泰机电设备有限公司经销著名品牌进口液压配件，经销品牌有德国力士乐（电磁阀，减压阀，溢流阀，插装阀，单向阀，压力继电器，节流阀，调速阀，叶片泵，柱塞泵），瑞士万福乐换向阀，美国威格士，意大利ATOS，美国ASCO等，产品广销各地，如广州，深圳，上海，北京，天津，沈阳，武汉，长沙，桂林，南京，宁夏，银川，哈尔滨，郑州，昆明，南昌，杭州，福州，大连，济南，南宁，克拉玛依，衡阳，肇庆，启东，泰兴，合肥，英德，晋中，青岛，荆门，十堰，黄石，唐山，成都，重庆，西安，柳州，昆明，乌鲁木齐，得到广大客户一致肯定及好评。

比例阀是一种新型的液压控制装置。在普通压力阀、流量阀和方向阀上，用比例电磁铁替代原有的控制部分，按输入的电气信号连续地、按比例地对油流的压力、流量或方向进行远距离控制。比例阀一般都具有压力补偿性能，输出压力和流量可以不受负载变化的影响 。
      随着液压传动和液压伺服系统的发展， 生产实践中出现一些即要求能够连续的控制 压力、流量和方向，又不需要其控制精度很 高的液压系统。由于普通的液压元件不能满 足具有一定的伺服性要求，而使用电液伺服 阀又由于控制精度要求不高而过于浪费，因 此近几年产生了介于普通液压元件 （开关控制） 和伺服阀 （连续控制） 之间的比例控制 阀。
电液比例控制阀（简称比例阀）实质上是一种廉价的、抗污染性能较好的电液控制阀。比例阀的发展经历两条途径，一是用比例电磁铁取代传统液压阀的手动调节输入机构，在传统液压阀的基础下：发展起来的各种比例方向、压力和流量阀；二是一些原电液伺服阀生产厂家在电液伺服阀的基础上，降低设计制造精度后发展起来的。
          按比例阀控制方式分类是指按照比例阀的先导控制阀中的电气一机械转换方式来分类，其电控制部分有比例电磁铁、力矩马达、直流伺服电动机等多种形式。
（1）电磁式 电磁式是指采用比例电磁铁作为电气一机械转换元件的比例阀，比例电磁铁将输入的电流信号转换成力、位移机械信号输出．进而控制压力、流量及方向等参数。
（2）电动式 电动式是指采用直流伺服电动机作为电气一机械转换元件的比例阀，直流伺服电动机将输入的电信号．转换成旋转运动转速，再经丝杆螺母、齿轮齿条或齿轮凸轮等减速装置和变换机构，输出力与位移，进一步控制液压参数。
（3）电液式 电液式是指采用力矩马达和喷嘴挡板的结构为先导控制级的比例阀。对力矩马达输入不同的电信号，并通过同它连接在一起的挡板（有时力矩马达的衔铁就是挡板）输出位移或角位移，改变挡板和喷嘴之间的距离，使喷嘴喷出的油液流阻产生变化，进而控制输小参数。 
          比例控制阀是一种按输入的电信号连 续、按比例地控制液压系统的流量、压力和 方向的控制阀，其输出的流量和压力可以不受负载变化的影响。
比例阀与普通液压元件相比，有如下特点：
（1）电信号便于传递，能简单地实现远 距离控制。
（2）能连续、按比例地控制液压系统的 压力和流量，实现对执行机构的位置、速 度、力量的控制，并能减少压力变换时的冲 击。
（3）减少了元件数量，简化了油路。
同时电液比例阀的使用条件和保养与一 般液压元件相同，比伺服阀的抗污染性能 强，工作可靠。

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