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阀、插装阀、比例阀等
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武穴黎翔机电设备有限公司REXROTH力士乐销售部
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广泛应用于钢铁、冶金、铝行业、石油化工、航天、船舶制造、煤炭、水泥、电力、汽车、工程机械、食品、药业、林业、纺织、皮革、造纸等行业比例阀采用阀芯+阀体结构。伺服阀和伺服比例阀主要应用在闭环控制系统，比例阀的驱动装置是比例电磁铁。
伺服阀的驱动装置是力马达或力矩马达.阀体兼作阀套。
驱动装置不同.所以近些年出现了比例伺服阀。
比例阀一般最高几十Hz，伺服阀中位没有死区，伺服阀对液压油液的要求更高.性能参数不同；否则容易堵塞，
用来控制流量和流向，比例阀要求低一些.比例阀有中位死区；
比例阀和伺服阀的区别主要体现在以下几点：
逐渐向伺服阀靠近，
比例换向阀属于比例阀的一种，滞环、中位死区、频宽、过滤精度等特性不同.阀的额定压降不同；比例换向阀具有与普通换向阀相似的中位机能，
而比例伺服阀性能介于伺服阀和比例阀之间，因此应用场合不同，伺服阀和伺服比例阀采用阀芯+阀套的结构。中位机能种类不同.其它结构的比例阀主要应用在开环控系统及闭环速度控制系统；因为比例阀的性能越来越好；2伺服阀的频响（响应频率）更高。阀芯结构及加工精度不同.伺服阀与比例阀之间的差别并没有严格的规定。
，可以高达200Hz左右，需要精过滤才行，而伺服阀中位机能只有O型（Rexroth产品的E型）。
伺服阀其实缺点极多：能耗浪费大、容易出故障、抗污染能力差、价格昂贵等等等等，好处只有一个：动态性能是所有液压阀中最高的。就凭着这一个优点，在很多对动态特性要求高的场合不得不使用伺服阀，如飞机火箭的舵机控制、汽轮机调速等等。动态要求低一点的，基本上都是比例阀的天下了。
一般说来，好像伺服系统都是闭环控制，比例多用于开环控制；其次比例阀类型要多，有比例压力、流量控制阀等，控制比伺服要灵活一些。从他们内部结构看，伺服阀多是零遮盖，比例阀则有一定的死区，控制精度要低，响应要慢。但从发展趋势看，特别在比例方向流量控制阀和伺服阀方面，两者性能差别逐渐在缩小，另外比例阀的成本比伺服阀要低许多，抗污染能力也强！
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