行业新闻
原文：
Industrial automation instruments, VDC isCheck Valves
widely applied to pneumatic control valve, the high degree of automation of production plays an important role because of its simple structure, but often people value. Process in the chemical production process of Instrument reconciliations more complex condition, Anzhuang process in Guan Jian Guan Dao on the pneumatic regulator valve if there are problems, You Yu impact on production greater Yibiaoweixiu Renyuan psychological pressure greater Shoumangjiaoluan question is difficult to pinpoint, and often thankless, but also put into operation system, system security, regulation quality, andButterfly Valves
environmental pollution, thus affecting the process control valve repair phenomenon of production often occur. I have 5 sets of plant re-alkali carbonation process cooling tower system uses a pneumatic valve control 10 sets of cooling water into the tower, were 5 sets of DC water regulating valve, 5 circulating water regulating valve. Operation in recent years, the control valve stem and valve gland leak and have not been able to eliminate the problem. On the one hand the water leak to the surface of corroded Forged Steel Valves
body, affecting the life of the valve, re-alkali process on the floor causing pollution; the other hand the leakage rate of group assessment instrument installation and maintenance company ranks first in each class, affecting team building.
2, causes control valve leakage
Pneumatic valve stem and the body sealing Maintenance Safety valves
Department as follows: first valve actuator and valve body are separated from, and then open the lid and remove the gland under the gasket, hook the stuffing inside the "V" type filler, replacement of the packing, then Shanghao gland that maintenance is completed. Such an overhaul, the general can only maintain two to six months, some even appeared in the finished repair leakage, but not pressure tight gland will be affected and adjust the valve. Maintenance of the general increase in the initial 4 to 6 ring "V"-shaped filler, then gradually decreased as the spring tension, the increase of "V"-shaped filler gradually increased, and now has increased to more than a dozen laps. From the above analysis results is mainly Reducing Valves
due to poor sealing stuffing in the spring loses elasticity as rust, and we used PTFE seal packing hard, pressure tight, filler will stem locking, resulting in valve movement of the door, pressure seal is too loose will not achieve any effect.
原文来自：http://www.nytimes.com/1990/07/24/nyregion/engineers-battle-to-restart-pump-to-halt-sewage-flow.html
Engineers Battle to Restart Pump to Halt Sewage Flow;是由 上海一环流体控制设备有限公司提供的阀门新闻，中文译文仅供参考，以下提供站内导航搜索：
中国止回阀网 止回阀产品 止回阀知识 止回阀厂商 止回阀博客 止回阀行业新闻
以下是参考译文：
译文：VDC调节阀检修技巧以及泄漏的原因
工业自动化仪表中，VDC气动调节阀应用十分广泛，在闸阀
自动化程度高的企业生产中起着重要的作用但因其结构简单往往不被人们重视。在化工生产工艺过程中仪表调节的工作条件比较复杂，安装在关键工艺管道上的气动调节阀一旦出现问题，由于对生产产生影响较大，仪表维修人员的心理压力亦较大，手忙脚乱的问题很难找准，常常费力不讨好，还涉及系统投运、系统安全、调节品质、环境污染等，因蝶阀
而检修调节阀而影响工艺生产的现象常有发生。我厂重碱工序5台碳化塔的冷却系统采用了10台气动调节阀控制进塔冷却水量，分别为5台直流水调节阀，5台循环水调节阀。在近几年的运行中，调节阀的阀杆及阀体的截止阀
压盖处泄漏问题一直无法消除。一方面泄漏的水使阀体表面严重锈蚀，影响阀门的使用寿命，对重碱工序的楼面造成了污染；另一方面使泄漏率组考核居仪安装维修公司各班之首，影响了班组建设。
2、调节阀泄漏的原因
气动调节阀阀杆与阀体密封处的检修方式如下：先将阀门执行机构与阀体脱开，然后打开上压盖，取出压盖下的垫片，钩出填料函里面的 “V”型填料，更换新的填料，然后上好压盖即检修完毕。这样检修一次，一般安全阀
只能维持两到六个月，有些甚至在检修完后就出现泄漏的情况，而且压盖不能压的太紧，否则会影响阀门自动调节。在检修初期一般加4~6圈“V”形填料，后来由于弹簧张力逐步减弱，所加的“V”形填料逐步增加，到减压阀
现在已经增加到十几圈。从上述情况分析得出，密封不好的主要原因是填料函内弹簧由于生锈失去弹性，而我们所用的四氟密封填料较硬，压的太紧，填料会将阀杆抱死，造成阀门动作不灵活，压的疏水阀
太松起不到密封作用。
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