京蝶閥門良工閥門法蘭軟密封低溫球閥

產品工作原理和用途：

       京蝶閥門良工閥門法蘭軟密封低溫球閥主要適用于乙烯、液化天然氣等化工裝置上，輸出的液態低溫介質如乙烯、液氧、液氫等。這類介質不但易燃易爆，而且在升溫時要氣化、氣化是體積膨脹數百倍。而且這些介質滲透力強，易泄露，加工制造比較困難。

      產品結構特點：

       1.承壓件的材料能承受介質溫度的變化而引起的膨脹、收縮、密封部位的結構在溫度變化時不會產生變形。用于-100℃以下工況時，閥門零件在精加工前應進行深冷處理，即將零件浸放在液氮箱中進行冷卻，當零件溫度達到-192℃時，開始保溫1-2h，然后取出箱外自然處理到常溫，重溫循環2次。

       2、閥蓋采用長勁結構，其目的保護填料函的功能，使填料函處于離低溫較遠的位置，保證填料的密封效果，同時還可以纏繞保冷材料，防止冷能損失。長頸的頸長可根據使用溫度和保冷材料的厚度來選擇不同的長度。當填料密封效果降低時，可以從填料函中間加入潤滑脂形成油封層，降低填料函的壓差，提高密封性能。

       3、使用溫度低于-100℃時，閥桿材料經過鍍鉻或氮化處理，提高閥桿表面硬度，提高填料密封的可靠性。

       4、低溫球閥具有防止異常升壓結構，由于低溫閥門介質氣化后，其體積急劇膨脹，壓力會異常升高，當閥門中腔壓力升高時，閥門中腔和進口連通，或在閥門進口端安置泄壓閥，保證閥門安全使用。

       5、低溫球閥用的墊片具有在常溫下、低溫狀態及溫度變化下能可靠密封性和復原性。

產品性能參數：

 產品主要零件材料：

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產品主要尺寸：