力士乐4WRPEH 6 C3 B25P-3X/M/24A1液压阀

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力士乐4WRPEH 6 C3 B25P-3X/M/24A1液压阀                                  力士乐4WRPEH 6 C3 B25P-3X/M/24A1液压阀

低温截止阀是一种工作在低温气氢或液氢介质中,用来接通或切断管路介质的装置。本文介绍一种用于氢氧发动机试验台上的低温截止阀,针对在使用过程中出现阀门无法动作的问题,进行了故障分析,通过改进结构,使阀门正常运行于试验系统中。 
二、结构特点 
    1、技术参数 
    低温截止阀的技术参数如下。 
    工作介质低温气氢、液氢 
    公称通径65mm 
    使用压力25MPa 
    ***使用温度液氢温度 
    驱动方式气动(气缸双向通气) 
    操作气源氮气,5±012MPa 
    连接方式法兰式 

   2、结构 
        低温截止阀由阀体、阀瓣、阀杆和汽缸等组成。阀体、阀盖和阀杆等均采用不锈钢,阀瓣采用铜。上下两段阀杆中间用环氧酚醛层压玻璃钢布板实现绝热,法兰密封面采用铝垫片,填料使用聚四氟乙烯,汽缸使用双特密封,以减小摩擦力,阀门整体采用聚氨酯发泡保温。
三、设计 
    1、材料选用 
        航天火箭用低温推进剂一般有液氢、液氧和氟等,因此要求阀门材料能耐低温、耐腐蚀与低温介质相容并具有比较低的导热性。目前,运用较多的金属材料有奥氏体钢、铜或铝等,非金属材料有玻璃钢、聚四氟乙烯等。 
        从金相考虑,金属材料中具有面心立方晶格的奥氏体钢、铜和铝在低温状态下不会出现低温脆性,但因铝及铝合金的硬度不高,铝密封面的耐磨、耐擦伤性能差,所以在低温阀门中的使用有一定的限制,仅用于低压和小口径阀门中。 
        力士乐REXROTH截止阀低温阀门用垫片必须在常温、低温及温度变化下具有可靠的密封性和复原性,因此一般选择性能变化小的垫片材料。如浸渍聚四氟乙烯的石棉填料或成型塑料件填料,而玻璃钢由于导热系数很小,大多用作热桥元件。 
    2、密封结构 
        在关闭件设计时,阀座采用较硬的材料---不锈钢,阀瓣采用较软的材料---铜,当低温下奥氏体发生相变时,密封面高低不平,软材料在操作力的作用下产生形变而使其与阀座贴合紧密,补偿由于热应力和组织应力引起的材料变形,解决了高压低温工况下的密封性问题。 

         3、绝热结构 
       为较好地实现低温截止阀的绝热,将阀盖设计成细长结构,加长热桥,防止因填料函部分过冷而使处在填料函部位的阀杆以及阀盖上部的零件结霜,影响使用。采用隔热垫(材料为环氧酚醛层压玻璃钢布)将阀杆分为上、下两部分,减小热流,实现绝热。阀门整体采用外绝热形式,使用聚氨脂发泡保温,保层厚200mm。 
 四、故障分析 
    低温截止阀应用于试验系统后,出现了无法动作的故障。在对该阀解体后发现,阀杆与阀盖出现了咬合,阀杆表面的中心线对称位置处有两处较深的划痕,与之相配的阀盖下法兰相应位置上也有两处划痕。经过分析,引起故障的原因有两方面。 
    1、存储期 
    阀门存放期间水平放置并处于开启状态,阀杆与阀瓣形成悬臂梁结构,悬臂长147mm,悬臂重418kg。由于重力作用引起下阀杆弯曲,使得下阀杆和阀盖法兰孔同轴度偏差增大。原设计中同轴度偏差为0.1mm,拆除后实测同轴度偏差约为0.4mm。由于两零件材料均为OCr18Ni9不锈钢,低温下无法进行润滑,动作时由于同轴度偏差大产生咬合现象。 
    2、加工期 
    经检查,阀盖上的销钉槽没有按图纸加工。将方形槽加工成圆弧形槽,影响了销钉和销钉槽的正常配合,下阀杆承受侧向力,从而导致下阀杆和阀盖产生干涉。

力士乐REXROTH四位四通高频单向阀门，直接驱动，具有集成电子和电气位置反馈（OBE）4WRPEH 10
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力士乐REXROTH高响应的换向阀，直接操作，集成的数字轴控制器（IAC多以太网）4WRPDH
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力士乐REXROTH带集成的数字轴控制器的高响应阀（iac-r）和现场总线接口4WRPNH../24C/P
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