開關限位調整不到位，便是導致管道閥門泄漏的主要原因之一。且對閥門內漏問題進行檢查的一步便是對開關進行檢查，看閥門開關是否全關到位。當前管道中的閥門在全關時，閥門的閥球與閥體之間僅需相差2°～3°，便會導致介質泄漏產生。而由于一般的旋塞閥閥門都有縮徑，因此，關閉鍵與閥體間需要相差10°～15°才會出現內漏現象，且一般導致閥門開關限位不到位的主要情況有以下幾種：一，閥門在生產工廠內安裝或者是在運輸、裝卸環節，導致閥門的鏈接附件與閥門驅動裝置配角出現錯位，從而導致限位偏差，進而在使用時出現內漏情況。二，且對于裝配有閥門限位塊的球閥、埋地閥門，由于有加長閥桿，閥門會隨著使用時期的增長，導致閥門內氧化鐵銹以及其他雜物落入閥門下，便容易在閥桿與限位塊間堆積灰塵等物體，一旦形成一定的體積，便會導致閥門無法全關到位，進而形成閥門內漏。三，由于閥門長時期未得到保養維護，從而導致閥門齒輪箱內的潤滑膠變硬或齒輪氧化導致鐵銹堆積以及縣委螺栓松動等諸多因素，從而導致閥門限位出現偏差，進而出現閥門內漏現象[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閥門內部雜質較多
2.2 there are many impurities inside the valve
對于閥門內漏來說，其主要的一個原因就是內部的雜質較多，這些雜質可以是石頭、鐵銹、焊渣等。一，閥門在制造初期，試驗階段時沒有把內部的水分完全排干，或排干后沒有采取干燥、防腐、潤滑脂等保護措施，造成閥門內部腐蝕和內部泄漏；二，閥門在施工前，安裝的時候沒有很好的保護好兩邊的閥門，使得多余的雨水、石塊、泥漿等浸入翻門內部，導致閥體與密封圈之間由于存在雜質而變得不夠緊湊，導致閥門底座出現彈簧槽或者是發生“O”形變化，進而導致內漏現象發生；三，施工環節中安全系數不夠，施工細節做得不夠到位，使得施工現場出現的雜物、器具等進入到內部，使得閥門由于密封性不夠好而發生內漏現象；四，閥門相關的動作頻率大，使得多余的雜質與污泥堆積在閥門的密封層，導致堆積、硬墊等現象的發生，這種現象一旦產生，閥門就會無法正常關閉，使得內部發生泄漏等。
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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