目前(qian)現(xian)有(you)技術領域(yu)中(zhong)的(de)保(bao)(bao)溫球閥(fa)也稱(cheng)夾(jia)套(tao)球閥(fa)，是在球閥(fa)的(de)基礎上焊裝金屬(shu)夾(jia)套(tao)，夾(jia)套(tao)與閥(fa)體之間構成保(bao)(bao)溫通(tong)道(dao)，通(tong)道(dao)內注入蒸汽或(huo)其他保(bao)(bao)溫介質(zhi)(zhi)，確保(bao)(bao)閥(fa)內介質(zhi)(zhi)能夠(gou)正(zheng)常(chang)工(gong)作。保(bao)(bao)溫球閥(fa)具有(you)良(liang)好(hao)的(de)保(bao)(bao)溫特(te)性(xing)，且(qie)閥(fa)門的(de)通(tong)徑與管徑一致，同(tong)時(shi)又能有(you)效(xiao)地(di)降低管路中(zhong)介質(zhi)(zhi)熱量損(sun)失。主要用于石(shi)油、化工(gong)、冶金、制(zhi)藥(yao)、食品等(deng)各類系統中(zhong)，以輸送常(chang)溫下會凝(ning)固(gu)的(de)高粘度介質(zhi)(zhi)。

        因受(shou)閥(fa)門密(mi)(mi)封結(jie)構(gou)(gou)及其(qi)相對應的(de)(de)(de)密(mi)(mi)封材(cai)料(liao)的(de)(de)(de)制約，其(qi)使(shi)(shi)用(yong)(yong)(yong)的(de)(de)(de)溫(wen)(wen)度(du)小于(yu) 200℃。而且長(chang)時(shi)間(jian)在 200℃ 的(de)(de)(de)工(gong)況下(xia)(xia)使(shi)(shi)用(yong)(yong)(yong)，壽(shou)命較短。雖然閥(fa)座方(fang)面(mian)可選(xuan)用(yong)(yong)(yong)短時(shi)間(jian)能(neng)耐 300 ℃ 的(de)(de)(de)高強度(du)石(shi)墨材(cai)料(liao)，但閥(fa)門中(zhong)還(huan)有許多(duo)需要(yao)密(mi)(mi)封的(de)(de)(de)部位仍(reng)無法(fa)在高溫(wen)(wen)場合(he)下(xia)(xia)密(mi)(mi)封，特別是(shi)徑(jing)向(xiang)(xiang)密(mi)(mi)封方(fang)面(mian)，高強度(du)石(shi)墨材(cai)料(liao)不適(shi)宜(yi)做(zuo)徑(jing)向(xiang)(xiang)密(mi)(mi)封。通常的(de)(de)(de)保(bao)溫(wen)(wen)球(qiu)(qiu)(qiu)閥(fa)徑(jing)向(xiang)(xiang)密(mi)(mi)封是(shi)采(cai)用(yong)(yong)(yong) O 形(xing)(xing)圈(quan)密(mi)(mi)封結(jie)構(gou)(gou)，這(zhe)樣(yang)(yang)整臺閥(fa)門的(de)(de)(de)使(shi)(shi)用(yong)(yong)(yong)溫(wen)(wen)度(du)直接(jie)受(shou)到 O 形(xing)(xing)圈(quan)使(shi)(shi)用(yong)(yong)(yong)溫(wen)(wen)度(du)的(de)(de)(de)制約，目前保(bao)溫(wen)(wen)球(qiu)(qiu)(qiu)閥(fa)上(shang)使(shi)(shi)用(yong)(yong)(yong)的(de)(de)(de) O 形(xing)(xing)圈(quan)是(shi)氟橡膠(jiao)，而氟橡膠(jiao)的(de)(de)(de)使(shi)(shi)用(yong)(yong)(yong)溫(wen)(wen)度(du)在 200℃ 以內(nei)，且不能(neng)長(chang)期在這(zhe)極限溫(wen)(wen)度(du)內(nei)使(shi)(shi)用(yong)(yong)(yong)。遠(yuan)遠(yuan)不能(neng)滿足市場中(zhong)許多(duo)介(jie)質的(de)(de)(de)要(yao)求，如工(gong)況介(jie)質為松(song)香時(shi)，其(qi)要(yao)求保(bao)溫(wen)(wen)球(qiu)(qiu)(qiu)閥(fa)的(de)(de)(de)使(shi)(shi)用(yong)(yong)(yong)溫(wen)(wen)度(du)為 300 ℃，這(zhe)樣(yang)(yang)才有利于(yu)松(song)香介(jie)質獲得較為理想的(de)(de)(de)流動性，傳統中(zhong)用(yong)(yong)(yong) O 形(xing)(xing)圈(quan)作為密(mi)(mi)封零件時(shi)，就無法(fa)滿足其(qi)要(yao)求。

根據(ju)保溫球閥存在的問題，確定對保溫球閥的密封材(cai)料和結構進行(xing)改進。

（1）首先在支承圈(quan)(quan)(quan)(quan)與閥(fa)(fa)體之間(jian)(jian)，通(tong)常(chang)采(cai)(cai)用(yong) O 形(xing)圈(quan)(quan)(quan)(quan)作徑向(xiang)密(mi)封(feng)(feng)(feng)的(de)結(jie)構進(jin)行改進(jin)，取消采(cai)(cai)用(yong) O 形(xing)圈(quan)(quan)(quan)(quan)的(de)密(mi)封(feng)(feng)(feng)結(jie)構，支承圈(quan)(quan)(quan)(quan)上直接(jie)加(jia)工出臺階結(jie)構使(shi)支承圈(quan)(quan)(quan)(quan)與閥(fa)(fa)體之間(jian)(jian)組成密(mi)封(feng)(feng)(feng)腔(qiang)．在密(mi)封(feng)(feng)(feng)腔(qiang)內裝上耐(nai)高(gao)溫(wen)的(de)柔性石墨材料的(de)密(mi)封(feng)(feng)(feng)圈(quan)(quan)(quan)(quan)，在密(mi)封(feng)(feng)(feng)圈(quan)(quan)(quan)(quan)后面(mian)加(jia)裝一個帶錐截面(mian)的(de)墊(dian)(dian)圈(quan)(quan)(quan)(quan)，墊(dian)(dian)圈(quan)(quan)(quan)(quan)后面(mian)裝上專用(yong)結(jie)構的(de)螺(luo)(luo)塞，這(zhe)樣通(tong)過(guo)旋(xuan)緊螺(luo)(luo)塞，螺(luo)(luo)塞將(jiang)力傳遞給墊(dian)(dian)圈(quan)(quan)(quan)(quan)，墊(dian)(dian)圈(quan)(quan)(quan)(quan)的(de)錐截面(mian)將(jiang)擠壓密(mi)封(feng)(feng)(feng)圈(quan)(quan)(quan)(quan)，密(mi)封(feng)(feng)(feng)圈(quan)(quan)(quan)(quan)產生(sheng)變形(xing)，使(shi)其在徑向(xiang)內外貼緊支承圈(quan)(quan)(quan)(quan)和(he)閥(fa)(fa)體，從而使(shi)保(bao)溫(wen)球閥(fa)(fa)在徑向(xiang)獲(huo)得耐(nai)高(gao)溫(wen)的(de)密(mi)封(feng)(feng)(feng)結(jie)構，同時(shi)，通(tong)過(guo)旋(xuan)緊螺(luo)(luo)塞，使(shi)球體與閥(fa)(fa)座之間(jian)(jian)產生(sheng)預緊密(mi)封(feng)(feng)(feng)力，使(shi)其獲(huo)得密(mi)封(feng)(feng)(feng)。

（2）在閥座密封結(jie)構上亦做出相應的(de)改進，采(cai)用鑲入(ru)式結(jie)構，將閥體及支承圈挖(wa)出凹槽，凹槽底端(duan)裝(zhuang)入(ru)密封性能(neng)(neng)(neng)優越且耐高溫(wen)(wen)(wen)的(de)柔性石墨，既能(neng)(neng)(neng)起到(dao)閥座底端(duan)的(de)密封作用，又能(neng)(neng)(neng)起到(dao)各密封副之間因熱脹冷縮的(de)補償作用。在柔性石墨上面(mian)裝(zhuang)上耐高溫(wen)(wen)(wen)的(de)金屬閥座，使用溫(wen)(wen)(wen)度可(ke)提高到(dao) 425℃ 以內長時(shi)間使用，從而解決了保(bao)溫(wen)(wen)(wen)球閥不(bu)能(neng)(neng)(neng)在 200℃ 以上長時(shi)間使用的(de)局面(mian)。并且還可(ke)根據實際工況的(de)要求(qiu)選用不(bu)同材質的(de)閥座。

（3）中(zhong)起排(pai)(pai)泄作(zuo)用的底(di)端接管(guan)與(yu)堵頭(tou)(tou)是螺紋連接，當溫度升高時，螺紋部分的密封(feng)(feng)很難(nan)保(bao)證，決定取消(xiao)堵頭(tou)(tou)，中(zhong)與(yu)底(di)端接管(guan)連接的堵頭(tou)(tou)換上(shang)臺階(jie)式排(pai)(pai)污堵頭(tou)(tou)，連接端用纏繞墊進行密封(feng)(feng)，確保(bao)底(di)端的密封(feng)(feng)可靠性。