4WRPEH6C3B12L-2X/G24K0/A1M订货号0811404601-力士乐比例伺服阀

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REXROTH力士乐，REXROTH不仅是世界前***公司，也是世界高科技企业之一，50多年来，Bosch Rexroth集团及Bosch Rexroth公司的业务部门致力开发专业型液压传动领域高科技产品，产品和品牌已享誉全球。目前大陆以晨鸣机电代理为主。力士乐的产品是的，因为在世界市场上，目前没有其他的品牌能向顾客提供所有传动与控制技术，专门化与一体化并举。正因如此，博世-力士乐在液压传动、控制及移动技术等领域成为了世界性的榜样。力士乐（ Rexroth）为工业及工厂自动化、行走机械、以及可再生能源等领域的客户提供传动、控制与移动解决 方案；作为全球超过50万客户的共同选择，力士乐正不断为客户提供高质量的电控、液压、气动以及机电一体化元件和系统。Rexroth-力士乐气动产品大量应用在钻修设备的气路上，以及Caterpillar卡特匹勒与All***n艾里逊变速箱的配合中以实现动力的操作和控制。以 Rexroth-力士乐高性能的液压产品为依托，Rexroth向钢铁行业提供连铸、连轧等生产线的全套液压系统和液压元件。Bosch Rexroth博世-力士乐在船舶和海洋钻井平台的液压和气动传动系统及控制方面具有渊博的经验，产品应用在钻井平台、推进系统、舵机系统、发动机控制系统等等

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伺服阀的主阀一般来说和换向阀一样是滑阀结构，只不过阀芯的换向不是靠电磁铁来推动，而是靠前置级阀输出的液压力来推动，这一点和电液换向阀比较相似，只不过电液换向阀的前置级阀是电磁换向阀，而伺服阀的前置级阀是动态特性比较好的喷嘴挡板阀或射流管阀。

也就是说，伺服阀的主阀是靠前置级阀的输出压力来控制的，而前置级阀的压力则来自于伺服阀的入口p，假如p口的压力不足，前置级阀就不能输出足够的压力来推动主阀芯动作。

而我们知道，当负载为零的时候，如果四通滑阀完全打开，p口压力=t口压力+阀口压力损失(忽略油路上的其它压力损失)，如果阀口压力损失很小，t口压力又为零，那么p口的压力就不足以供给前置级阀来推动主阀芯，整个伺服阀就失效了。所以伺服阀的阀口做得偏小，即使在阀口全开的情况下，也要有一定的压力损失，来维持前置级阀的正常工作。

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，比例阀多用于开环控制;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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