硬密封(feng)蝶閥是指密封(feng)副的(de)兩側均是金(jin)(jin)屬材料(liao)或較(jiao)硬的(de)其它(ta)材料(liao)的(de)被稱為"硬密封(feng)"。蝶閥 硬密封(feng)的(de)密封(feng)性能(neng)較(jiao)差，但耐高溫，抗磨損(sun)，機械性能(neng)好.如:鋼(gang)(gang)+鋼(gang)(gang)；鋼(gang)(gang)+ 銅(tong)；鋼(gang)(gang)+石(shi)墨；鋼(gang)(gang)+合(he)金(jin)(jin)鋼(gang)(gang)；（這里的(de)鋼(gang)(gang)也可能(neng)是鑄鐵，鑄鋼(gang)(gang)，合(he)金(jin)(jin)鋼(gang)(gang)也可能(neng)是堆焊，噴涂(tu)的(de)合(he)金(jin)(jin)）。
軟(ruan)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)蝶閥：密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)副的(de)(de)兩側(ce)一側(ce)是(shi)(shi)金(jin)屬(shu)材料(liao)(liao)，另(ling)一側(ce)是(shi)(shi)有(you)彈性(xing)(xing)(xing)(xing)的(de)(de)非金(jin)屬(shu)材料(liao)(liao)的(de)(de)被(bei)稱(cheng)為"軟(ruan)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)".這(zhe)種密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)的(de)(de)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)性(xing)(xing)(xing)(xing)能(neng)(neng)較好(hao)，但不(bu)(bu)耐高溫，易(yi)磨損，機械性(xing)(xing)(xing)(xing)較差(cha)(cha)。如(ru): 鋼+橡膠；鋼+四(si)氟聚乙烯；軟(ruan)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)座采(cai)用(yong)具有(you)一定強度(du)、硬度(du)和耐溫性(xing)(xing)(xing)(xing)能(neng)(neng)的(de)(de)非金(jin)屬(shu)材料(liao)(liao)制(zhi)作(zuo)(zuo)，密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)性(xing)(xing)(xing)(xing)能(neng)(neng)好(hao)，可以作(zuo)(zuo)到(dao)零泄漏，但壽(shou)命(ming)和對(dui)(dui)溫度(du)的(de)(de)適應(ying)性(xing)(xing)(xing)(xing)比較差(cha)(cha)。硬密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)采(cai)用(yong)金(jin)屬(shu)制(zhi)作(zuo)(zuo)，密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)性(xing)(xing)(xing)(xing)能(neng)(neng)相(xiang)對(dui)(dui)比較差(cha)(cha)，盡管有(you)閥門(men)制(zhi)造商(shang)宣稱(cheng)可以作(zuo)(zuo)到(dao)零泄漏蝶閥。軟(ruan)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)對(dui)(dui)一部分有(you)腐蝕性(xing)(xing)(xing)(xing)的(de)(de)物料(liao)(liao)是(shi)(shi)不(bu)(bu)能(neng)(neng)滿足(zu)工藝要求的(de)(de)， 硬密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)碟(die)閥可以解決！這(zhe)兩種密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)可以相(xiang)互補(bu)充的(de)(de)，就密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)性(xing)(xing)(xing)(xing)而言軟(ruan)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)相(xiang)對(dui)(dui)較好(hao)，但是(shi)(shi)現在硬密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)的(de)(de)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)性(xing)(xing)(xing)(xing)也能(neng)(neng)夠滿足(zu)相(xiang)應(ying)的(de)(de)要求！軟(ruan)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)碟(die)閥的(de)(de)優(you)點(dian)是(shi)(shi)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)性(xing)(xing)(xing)(xing)能(neng)(neng)好(hao)，缺點(dian)是(shi)(shi)容易(yi)老(lao)化、磨損、使用(yong)壽(shou)命(ming)短。硬密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)碟(die)閥使用(yong)壽(shou)命(ming)長，但是(shi)(shi)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)性(xing)(xing)(xing)(xing)相(xiang)對(dui)(dui)比軟(ruan)密(mi)(mi)(mi)(mi)(mi)封(feng)(feng)(feng)(feng)蝶閥要差(cha)(cha)。
