开关限位调整不到位，便是导致管道阀门泄漏的主要原因之一。且对阀门内漏问题进行检查的一步便是对开关进行检查，看阀门开关是否全关到位。当前管道中的阀门在全关时，阀门的阀球与阀体之间仅需相差2°～3°，便会导致介质泄漏产生。而由于一般的旋塞阀阀门都有缩径，因此，关闭键与阀体间需要相差10°～15°才会出现内漏现象，且一般导致阀门开关限位不到位的主要情况有以下几种：一，阀门在生产工厂内安装或者是在运输、装卸环节，导致阀门的链接附件与阀门驱动装置配角出现错位，从而导致限位偏差，进而在使用时出现内漏情况。二，且对于装配有阀门限位块的球阀、埋地阀门，由于有加长阀杆，阀门会随着使用时期的增长，导致阀门内氧化铁锈以及其他杂物落入阀门下，便容易在阀杆与限位块间堆积灰尘等物体，一旦形成一定的体积，便会导致阀门无法全关到位，进而形成阀门内漏。三，由于阀门长时期未得到保养维护，从而导致阀门齿轮箱内的润滑胶变硬或齿轮氧化导致铁锈堆积以及县委螺栓松动等诸多因素，从而导致阀门限位出现偏差，进而出现阀门内漏现象[1]。
The switch limit adjustment is not in place, which is one of the main causes of pipeline valve leakage. The next step to check the internal leakage of the valve is to check the switch to see whether the valve switch is fully closed. When the valve in the current pipeline is fully closed, the difference between the valve ball and the valve body is only 2 ° ~ 3 °, which will lead to medium leakage. As general plug valves have diameter reduction, internal leakage will occur only when the closing key and valve body have a difference of 10 ° ~ 15 °, and the main conditions that generally lead to the valve switch limit not in place are as follows: first, the valve is installed in the production plant or in the transportation, loading and unloading links, resulting in the misalignment of the angle between the valve's connecting accessories and the valve driving device, resulting in the limit deviation, Thus, internal leakage occurs during use. 2、 In addition, for ball valves and buried valves equipped with valve limit blocks, due to the extended valve stem, the valve will cause oxidation rust and other sundries in the valve to fall under the valve with the growth of service life, and it is easy to accumulate dust and other objects between the valve stem and the limit block. Once a certain volume is formed, the valve will not be fully closed in place, thus forming internal leakage of the valve. 3、 As the valve has not been maintained for a long time, many factors, such as the hardening of lubricating glue in the valve gearbox or the oxidation of the gear, the accumulation of rust and the loosening of bolts of the county committee, have led to the deviation of the valve limit and the internal leakage of the valve [1].
2.2阀门内部杂质较多
2.2 there are many impurities inside the valve
对于阀门内漏来说，其主要的一个原因就是内部的杂质较多，这些杂质可以是石头、铁锈、焊渣等。一，阀门在制造初期，试验阶段时没有把内部的水分完全排干，或排干后没有采取干燥、防腐、润滑脂等保护措施，造成阀门内部腐蚀和内部泄漏；二，阀门在施工前，安装的时候没有很好的保护好两边的阀门，使得多余的雨水、石块、泥浆等浸入翻门内部，导致阀体与密封圈之间由于存在杂质而变得不够紧凑，导致阀门底座出现弹簧槽或者是发生“O”形变化，进而导致内漏现象发生；三，施工环节中系数不够，施工细节做得不够到位，使得施工现场出现的杂物、器具等进入到内部，使得阀门由于密封性不够好而发生内漏现象；四，阀门相关的动作频率大，使得多余的杂质与污泥堆积在阀门的密封层，导致堆积、硬垫等现象的发生，这种现象一旦产生，阀门就会无法正常关闭，使得内部发生泄漏等。
For the valve internal leakage, the main reason is that there are many internal impurities, which can be stone, rust, welding slag, etc. 1、 At the initial stage of manufacture, the internal water of the valve was not completely drained during the test phase, or the drying, anti-corrosion, grease and other protective measures were not taken after draining, resulting in internal corrosion and internal leakage of the valve; 2、 Before the construction of the valve, the valves on both sides were not well protected during installation, so that the excess rainwater, stones, mud, etc. were immersed into the inside of the flap door, resulting in insufficient compactness between the valve body and the sealing ring due to the presence of impurities, resulting in the spring groove or "O" shape change of the valve base, which led to internal leakage; 3、 The safety factor in the construction process is not enough, and the construction details are not done in place, which makes the sundries and appliances on the construction site enter into the interior, and makes the valve leak due to poor sealing; 4、 The high frequency of valve related actions causes excess impurities and sludge to accumulate on the sealing layer of the valve, resulting in accumulation, hard pad and other phenomena. Once this phenomenon occurs, the valve will not be able to close normally, resulting in internal leakage.
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