福州恒拓工业自动化有限公司手机：13665042399联系人：张 先 生 电话: 0591-83670532传真: 0591-83663000-816E-mail:2218067706@qq.com QQ:2218067706地址：福州市台江区鳌峰路5号榕佳楼1号7层 350009

Rexroth力士乐是全球领先的传动与控制专家。凭借在传动、控制及运动领域内的丰富经验，公司以力士乐为品牌，为全球80多个国家，50多万家客户提供量身定制的解决方案，是世界工业设备及工厂自动化、行走机械运用与可再生能源市场的合作伙伴。作为博世集团的全资子公司，2009年全球销售额近41亿欧元，拥有超过34200多名专业员工，其中包括中国员工2736名。自1978年开始，博世力士乐就开始了在中国的业务，并在上海、北京、常州和西安建立了工厂。   旗下产品REXROTH柱塞泵，REXROTH齿轮泵，REXROTH叶片泵，REXROTH电磁阀 REXROTH换向阀，REXROTH油泵，REXROTH导轨，REXROTH滚珠丝杆，REXROTH滑块，REXROTH比例阀，REXROTH传感器，REXROTH马达，REXROTH伺服阀，REXROTH继电器。涉及行业压路机、混泥土搅拌车、机床、汽车、纺织工业、轻工业、钢厂、采矿业、油田、石化、风能、通用自动化、水利工程、海事工程、冶金、塑料机械、通用机械、压机、钻孔机、叉车、推土机、起重机、装载机、混泥土泵、挖掘机、印刷与纸张处理、食品包装、木工机械、橡胶、电子和半导体。分类：　　国内外的电磁阀从原理上分为三大类（即：直动式、分步直动式、先导式），而从阀瓣结构和材料上的不同与原理上的区别又分为六个分支小类（直动膜片结构、分步重片结构、先导膜式结构、直动活塞结构、分步直动活塞结构、先导活塞结构）。 直动式电磁阀：　原理：通电时，电磁线圈产生电磁力把关闭件从阀座上提起，阀门打开；断电时，电磁力消失，弹簧把关闭件压在阀座上，阀门关闭。 特点：在真空、负压、零压时能正常工作，但通径一般不超过25mm。 分布直动式电磁阀　　原理：它是一种直动和先导式相结合的原理，当入口与出口没有压差时，通电后，电磁力直接把先导小阀 和主阀关闭件依次向上提起，阀门打开。当入口与出口达到启动压差时，通电后，电磁力先导小阀，主阀下腔压力上升，上腔压力下降，从而利用压差把主阀向上推开；断电时，先导阀利用弹簧力或介质压力推 动关闭件，向下移动，使阀门关闭。 特点：在零压差或真空、高压时亦能可*动作，但功率较大，要求必须水平安装。 先导式电磁阀　　原理：通电时，电磁力把先导孔打开，上腔室压力迅速下降，在关闭件周围形成上低下高的压差，流体压 力推动关闭件向上移动，阀门打开；断电时，弹簧力把先导孔关闭入口压力通过旁通孔迅速腔室在关阀 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