不銹(xiu)鋼、鑄鋼、法(fa)蘭、對(dui)夾式刀型閘(zha)閥關閉時,密(mi)封(feng)面可(ke)以只依(yi)靠介質壓(ya)力(li)來密(mi)封(feng),即(ji)依靠(kao)介質壓(ya)力將閘(zha)板的密封面(mian)壓(ya)向另一側的閥座(zuo)來保證(zheng)密封面(mian)的密封,這就(jiu)是自密封.大部分(fen)刀型閘閥是(shi)采用強制(zhi)密封的,即閥(fa)門關閉時(shi)，要依(yi)靠外力強行將閘(zha)板壓向閥(fa)座,以保證密封(feng)面的(de)密封(feng)性本類閥(fa)門在管道(dao)中一(yi)般(ban)應當(dang)水平安裝。刀型(xing)閘(zha)(zha)閥驅動(dong)(dong)(dong)方(fang)式：手動(dong)(dong)(dong)，電(dian)動(dong)(dong)(dong)，氣(qi)動(dong)(dong)(dong)，液動(dong)(dong)(dong)，傘齒輪，電(dian)液動(dong)(dong)(dong)和氣(qi)液動(dong)(dong)(dong)等(deng)驅動(dong)(dong)(dong)方(fang)式。刀型(xing)閘(zha)(zha)閥外形：明桿，暗桿兩種。刀型(xing)閘(zha)(zha)閥材質：鑄鐵(tie)、鑄鋼、碳(tan)鋼、不銹鋼、襯氟等(deng)。刀型(xing)閘(zha)(zha)閥密封：硬密封，軟密封，單(dan)面(mian)密封，雙面(mian)密封等(deng)多(duo)種材質密封。