主(zhu)調壓(ya)(ya)器(qi)堵塞。由(you)于焦(jiao)(jiao)(jiao)爐煤氣中含(han)有焦(jiao)(jiao)(jiao)油(you)(you)霧(wu)和(he)腐蝕性氣體(ti),易使(shi)主(zhu)調壓(ya)(ya)器(qi)和(he)閥口墊片造(zao)(zao)成(cheng)腐蝕。閥體(ti)表面因腐蝕而變得粗糙,這為焦(jiao)(jiao)(jiao)油(you)(you)的(de)滯(zhi)留提供了條件,易造(zao)(zao)成(cheng)主(zhu)閥口關(guan)閉,壓(ya)(ya)力升高,中壓(ya)(ya)輔(fu)助調壓(ya)(ya)器(qi)和(he)低壓(ya)(ya)輔(fu)助調壓(ya)(ya)器(qi)的(de)關(guan)閉壓(ya)(ya)力也隨之升高,造(zao)(zao)成(cheng)調壓(ya)(ya)器(qi)主(zhu)閥關(guan)閉不嚴,嚴重時會(hui)造(zao)(zao)成(cheng)中壓(ya)(ya)燃氣進入用戶。