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发布时间:2017-06-09 17:29:47   发布人:http://xacrystaledu.com
阀门密封面损坏的原因有是分为人为损坏和自然损坏两种的.人为损坏,一般是因为设计不周,制造不精,选材不当,安装不正,使用不好和维修不务等因素引起的,而自然损坏则是指阀门在正常工作情况下的磨损,是介质对密封面不可避免的腐蚀和况等造成的损坏,可以总结出造成密封面损坏的原因,可归纳为如下几种:
The damage causes of the valve sealing surface is divided into two kinds of man-made damage and natural damage. The damage, usually because of poor design, manufacturing is not fine, improper selection, installation is not correct, use and maintenance services do not cause bad factors, and natural damage refers to the valve in the normal work wear under the condition of medium on the sealing surface is damaged inevitably caused by corrosion and condition, can be summed up the causes of damage to the sealing surface, can be summarized as following:
1、密封面加工质量不好。主要表现在密封面上有裂纹,气孔和夹渣等缺陷,密封面硬度过高或过低,是由于选材不对或热处理不当引起的;密封面硬度不匀,不耐腐蚀,主要是由于在堆焊过程中将底层金属吹到上面来了,冲淡了密封面合金成分所引起的。
1, sealing surface processing quality is not good. Mainly there are cracks in the sealing surface, porosity and slag and other defects, the sealing surface hardness is too high or too low, is not due to improper material or heat treatment; uneven sealing surface hardness, corrosion, is mainly due to the welding process in metal bottom blown to the above, dilute the sealing surface of alloy component caused by.
2、造型不当和操作不良所的损坏,安装不正和维修不力导致密封面工作不正常,阀门带病运转,过早地损坏了密封面。

2, improper shape and bad operation of the damage, improper installation and maintenance, resulting in sealing surface work is not normal, the valve runs in disorder, prematurely damaged the sealing surface.
3、介质的化学腐蚀。介质直接与密封面起化学作用,腐蚀密封面.电化学腐蚀.密封面互相接触,密封面与关闭体和阀体的接触以及介质的浓度差,氧浓差等原因,发生电化学腐蚀。
3, chemical corrosion of medium. Medium direct chemical reaction with the sealing surface, sealing surface corrosion. The electrochemical corrosion. Contact between the sealing surface, sealing surface and the closure of the valve body and the concentration of media exposure and poor, poor concentration of oxygen causes, electrochemical corrosion.
4、介质的冲蚀。它是介质流动时对密封面磨损,冲刷,汽蚀的结果.介质混注和局部汽化时,产生气泡爆破冲击密封面表面,造成局部损坏.介质在一定的速度下,介质中的浮游细粒冲撞密封面,使其造成局部损坏;高速液动的介质直接冲刷密封面,使其造成局部损坏。
4. Erosion of medium. It is the medium flow of the sealing surface wear, erosion, cavitation results. The medium mixed injection and local vaporization, air explosion impact surface of the sealing surface, resulting in local damage. Medium at a certain speed, medium fine-grained pelagic collision sealing surface to cause local damage; direct scouring medium high speed liquid the sealing surface to cause local damage.
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