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< id='layer21D4F6DF3C0F6D104C9736DEBD768182' type='article_category' class='cstlayer' style='left: 391px; top: 554px; position: absolute; z-index: 106; width: 418px; height: 50px;' mid="" deg='0'>< class="wp-article_category_content" id="wp-atype_layer21D4F6DF3C0F6D104C9736DEBD768182" style="border-color: transparent; border-width: 0px; width: 418px; height: 50px;"> < skin="hs9" class="nav1 menu_hs9" ishorizon="" colorstyle="black" direction="0" more="更多" moreshow="1" morecolor="darkorange" hover="1" subopen="" submethod="" > < class="default_pid" style="display:none; width:0px; height:0px;">1 < id='layer7C0CF8F22851F564323E0BEA5A0024A9' type='article_detail' class='cstlayer' style='left: 0px; top: 658px; position: absolute; z-index: 107; width: 1200px; height: 405px;' mid="" deg='0'>< class="wp-article_detail_content" style="border-color: transparent; border-width: 0px; overflow: hidden; width: 1200px; height: 405px;"> < class="artdetail_title" style="display:block;font-family:Microsoft YaHei;font-size:16px;color:#e6101a;font-weight:bold;text-decoration:none;">未来我国阀门行业市场发展前景非常广阔 < class="artview_info" style="display:block;font-family:Microsoft YaHei;font-size:12px;color:#5A5A5A;font-weight:normal;text-decoration:none;"> < class="sourcedata"> 来源: | 作者:pro3c65e5 | 发布时间: 2017-09-14 | 6181 次浏览 | 分享到: < class="bdsharebuttonbox shareshow bshare-custom"> < class="artview_intro" style="display:none;"> < class="artview_content" style="display:block;font-family:Microsoft YaHei;font-size:14px;color:#5A5A5A;font-weight:normal;text-decoration:none;"> < class="artview_detail" setsid="article32">

有差距和存在问题并不可怕,只要我们调整好发展思路,增强发展的信心,强化企业管理,推进技术进步,重视技术创新和核心技术的研发,提高企业的核心竞争力。我们知道,大多数阀门所需要维修的工作量是极少的,这意味着大多数阀门不必经常修理。而有时即便是单纯的阀杆泄漏这样的小问题,往往因疏忽大意而成大问题。更有甚者,有些蛮干的操作者,不按技术规范的要求关闭阀门,导致阀杆弯曲或关闭件的严重损坏。这样的情况时有发生。在使用中有以下几种常用问题:

一、为什么双座阀小开度工作时容易振荡

对单芯而言,当介质是流开型时,阀稳定性好;当介质是流闭型时,阀的稳定性差。双座阀有两个阀芯,下阀芯处于流闭,上阀芯处于流开,这样,在小开度工作时,流闭型的阀芯就容易引起阀的振动,这就是双座阀不能用于小开度工作的原因所在。

二、为什么双密封阀不能当作切断阀使用

双座阀阀芯的优点是力平衡结构,允许压差大,而它突出的缺点是两个密封面不能同时良好接触,造成泄漏大。如果把它人为地、强制性地用于切断场合,显然效果不好,即便为它作了许多改进(如双密封套筒阀),也是不可取的。

三、什么直行程调节阀防堵性能差,角行程阀防堵性能好

直行程阀阀芯是垂直节流,而介质是水平流进流出,阀腔内流道必然转弯倒拐,使阀的流路变得相当复杂(形状如倒“S”型)。这样,存在许多死区,为介质的沉淀提供了空间,长此以往,造成堵塞。角行程阀节流的方向就是水平方向,介质水平流进,水平流出,容易把不干净介质带走,同时流路简单,介质沉淀的空间也很少,所以角行程阀防堵性能好。

四、为什么直行程调节阀阀杆较细

它涉及一个简单的机械原理:滑动摩擦大、滚动摩擦小。直行程阀的阀杆上下运动,填料稍压紧一点,它就会把阀杆包得很紧,产生较大的回差。为此,阀杆设计得非常细小,填料又常用摩擦系数小的四氟填料,以便减少回差,但由此派出的问题是阀杆细,则易弯,填料寿命也短。解决这个问题,最好的办法就是用旅转阀阀杆,即角行程类的调节阀,它的阀杆比直行程阀杆粗2~3倍,且选用寿命长的石墨填料,阀杆刚度好,填料寿命长,其摩擦力矩反而小、回差小。

五、为什么角行程类阀的切断压差较大?

角行程类阀的切断压差较大,是因为介质在阀芯或阀板上产生的合力对转动轴产生的力矩非常小,因此,它能承受较大的压差。

六、为什么脱盐水介质使用衬胶蝶阀、衬氟隔膜阀使用寿命短?

脱盐水介质中含有低浓度的酸或碱,它们对橡胶有较大的腐蚀性。橡胶的被腐蚀表现为膨胀、老化、强度低,用衬胶的蝶阀、隔膜阀使用效果都差其实质就是橡胶不耐腐蚀所致。后衬胶隔膜阀改进为耐腐蚀性能好的衬氟隔膜阀,但衬氟隔膜阀的膜片又经不住上下折叠而被折破,造成机械性破坏,阀的寿命变短。现在最好的办法是用水处理专用球阀,它可以使用到5~8年。

七、为什么切断阀应尽量选用硬密封

切断阀要求泄漏越低越好,软密封阀的泄漏是最低的,切断效果当然好,但不耐磨、可靠性差。从泄漏量又小、密封又可靠的双重标准来看,软密封切断就不如硬密封切断好。如全功能超轻型调节阀,密封而堆有耐磨合金保护,可靠性高,泄漏率达10~7,已经能够满足切断阀的要求。

八、为什么套筒阀代替单、双座阀却没有如愿以偿

20世纪60年代问世的套筒阀,70年代在国内外大量使用,80年代引进的石化装置中套筒阀占的比率较大,那时,不少人认为,套筒阀可以取代单、双座阀,成为第二代产品。到如今,并非如此,单座阀、双座阀、套筒阀都得到同等的使用。这是因为套筒阀只是改进了节流形式、稳定性和维护好于单座阀,但它重量、防堵和泄漏指标上与单、双座阀一致,它怎能取代单、双座阀呢?所以,就只能共同使用。

九、为什么说选型比计算更重要

计算与选型比较而言,选型要重要得多,复杂得多。因为计算只是一个简单的公式计算,它的本身不在于公式的精确度,而在于所给定的工艺参数是否准确。选型涉及到的内容较多,稍不慎,便会导致选型不当,不仅造成人力、物力、财力的浪费,而且使用效果还不理想,带来若干使用问题,如可靠性、寿命、运行质量等。

十、为什么在气动阀中活塞执行机构使用会越来越多

对于气动阀而言,活塞执行机构可充分利用气源压力,使执行机构的尺寸比薄膜式更小巧,推力更大,活塞中的O型圈也比薄膜可靠,因此它的使用会越来越多

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< id='layer5F87F64435FAEE683CF1E5C90F6ADEF1' type='media' inbuttom='1' class='cstlayer' style='left: 973px; top: 27px; position: absolute; z-index: 104; width: 111px; height: 111px;' mid="" deg='0'> < class="wp-media_content" style="overflow: hidden; width: 111px; height: 111px; border-width: 0px; border-style: solid; padding: 0px;" type="0"> < class="img_over" style='overflow: hidden; border-color: transparent; border-width: 0px; width: 111px; height: 111px; position: relative;'> < class="imgloading" style="z-index:100;"> < id='layerCEEB74EABD58D67063A9254DE26BAA88' type='title' inbuttom='1' class='cstlayer' style='left: 0px; top: 109px; width: 412px; height: 21px; position: absolute; z-index: 110;' mid="" deg='0'>< class="wp-title_content" style="padding: 0px; border: 0px solid transparent; width: 412px; height: 21px; display: block;word-wrap:break-word;">Copyright 2016 (上海)机械设备有限公司 版权所有
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