，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。
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武汉盛美特机电设备有限公司是一家专业从事国外进口液压电子元件、液压设备的贸易型公司。主要经营欧美品牌：REXROTH德国力士乐、VICKERS美国威格士、ATOS意大利阿托斯、SUN美国太阳、DENISON法国丹尼逊、PARKER美国派克、DUPLOMATIC意大利迪普马、HAWE德国哈威、CALZONI意大利卡桑尼、MOOG美国穆格等。
DSDU1078E16G TUEV FBAR
DSDU578P20G TUEV F300 200BARDSDU578P20G TUEV F300 180BAR
DSDU578P20K TUEV F370 330BAR
DSDU578P20G TUEV F300 190BAR
DSDU578P20G TUEV F320 230BAR
DSDU578P20G TUEV F320 210BAR
DSDU578P20K TUEV F370 315BAR
DSDU578P20K TUEV F370 350BAR
DSDU578P20E TUEV F240 110BAR
DSDU578P20E TUEV F265 160BAR
DSDU578P20E TUEV F240 120BAR
DSDU1078E25G TUEV F355 250BAR
DSDU1078E25G TUEV F235 90BAR
DSDU1078E25G TUEV F310 190BAR
DSDU1078E25K TUEV F390 280BAR
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DSDU1078E25K TUEV F400 350BARDSDU1078E32G BAR)
DSDU1078E32GX672 TUEV F800250B
DSDU1078E32K TUEV F900 280BAR
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DSDU1078E32E TUEV F640 130BAR
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DSDU1078E32E TUEV F550 80BAR
DSDU1078E32K TUEV F900 300BAR
DSDU1078E32K TUEV F950 350BAR
DSDU1078E32G TUEV F750 180BAR
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