京蝶閥門良工閥門法蘭軟密封低溫球閥

產(chǎn)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(tài)低溫介質(zhì)如乙烯、液氧、液氫等。這類介質(zhì)不但易燃易爆，而且在升溫時要氣化、氣化是體積膨脹數(shù)百倍。而且這些介質(zhì)滲透力強，易泄露，加工制造比較困難。

      產(chǎn)品結(jié)構(gòu)特點：

       1.承壓件的材料能承受介質(zhì)溫度的變化而引起的膨脹、收縮、密封部位的結(jié)構(gòu)在溫度變化時不會產(chǎn)生變形。用于-100℃以下工況時，閥門零件在精加工前應(yīng)進行深冷處理，即將零件浸放在液氮箱中進行冷卻，當(dāng)零件溫度達(dá)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(huán)2次。

       2、閥蓋采用長勁結(jié)構(gòu)，其目的保護填料函的功能，使填料函處于離低溫較遠(yuǎn)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(jù)使用溫度和保冷材料的厚度來選擇不同的長度。當(dāng)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(jīng)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(jié)構(gòu)，由于低溫閥門介質(zhì)氣化后，其體積急劇膨脹，壓力會異常升高，當(dāng)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(tài)及溫度變化下能可靠密封性和復(fù)原性。

產(chǎn)品性能參數(shù)：

 產(chǎn)品主要零件材料：

 ···································································································································································································································································································································································································································································································································································································

產(chǎn)品主要尺寸：