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    合金(jin)(jin)管(guan)(guan)(guan)(guan)帽(mao)(mao)也(ye)稱為合金(jin)(jin)堵頭、蓋(gai)頭、管(guan)(guan)(guan)(guan)子蓋(gai)、悶頭,裝在管(guan)(guan)(guan)(guan)端外螺紋(wen)上以蓋(gai)堵管(guan)(guan)(guan)(guan)子的管(guan)(guan)(guan)(guan)件(jian)。用來封閉(bi)管(guan)(guan)(guan)(guan)路，作用與管(guan)(guan)(guan)(guan)堵相(xiang)同，但管(guan)(guan)(guan)(guan)帽(mao)(mao)可直接旋在管(guan)(guan)(guan)(guan)子上，不須要其他(ta)合金(jin)(jin)管(guan)(guan)(guan)(guan)件(jian)。合金(jin)(jin)管(guan)(guan)(guan)(guan)件(jian)還有合金(jin)(jin)彎(wan)頭、合金(jin)(jin)三(san)通、合金(jin)(jin)彎(wan)管(guan)(guan)(guan)(guan)等。一般(ban)(ban)用于(yu)合金(jin)(jin)管(guan)(guan)(guan)(guan)子未端取(qu)(qu)樣口處(chu)，取(qu)(qu)樣完成后，要擰(ning)上管(guan)(guan)(guan)(guan)帽(mao)(mao)，其二是在特殊情況(kuang)(kuang)下，擰(ning)掉管(guan)(guan)(guan)(guan)帽(mao)(mao)后，可以絲(si)口接上管(guan)(guan)(guan)(guan)子，臨(lin)時連續取(qu)(qu)料或抽(chou)料。用管(guan)(guan)(guan)(guan)帽(mao)(mao)一般(ban)(ban)在壓力較低的情況(kuang)(kuang)下，便于(yu)拆(chai)卸檢修，高中壓情況(kuang)(kuang)下一般(ban)(ban)不用管(guan)(guan)(guan)(guan)帽(mao)(mao)。 管(guan)(guan)(guan)(guan)帽(mao)(mao)包括凸形(xing)管(guan)(guan)(guan)(guan)帽(mao)(mao)、錐(zhui)殼、變徑段、平蓋(gai)及緊(jin)縮(suo)口的設計。

    合金管(guan)(guan)(guan)帽(mao)(mao)(mao)與(yu)合金封(feng)頭形狀差不(bu)多,管(guan)(guan)(guan)帽(mao)(mao)(mao)尺(chi)(chi)寸比較小,可(ke)以鍛造(zao)(zao)；封(feng)頭尺(chi)(chi)寸比較大一點,一般(ban)用(yong)鋼(gang)板壓(ya)制,管(guan)(guan)(guan)帽(mao)(mao)(mao)一般(ban)用(yong)于管(guan)(guan)(guan)子的端(duan)部，封(feng)頭用(yong)于容器設備的上(shang)下(xia)（立式(shi)設備）部位或左右端(duan)部(臥(wo)式(shi)設備)。凸形管(guan)(guan)(guan)帽(mao)(mao)(mao)包括：半球(qiu)(qiu)形管(guan)(guan)(guan)帽(mao)(mao)(mao)、橢圓形管(guan)(guan)(guan)帽(mao)(mao)(mao)、碟形管(guan)(guan)(guan)帽(mao)(mao)(mao)和(he)球(qiu)(qiu)冠形管(guan)(guan)(guan)帽(mao)(mao)(mao)。從受力角度(du)看(kan)凸形管(guan)(guan)(guan)帽(mao)(mao)(mao)中(zhong)從半球(qiu)(qiu)形管(guan)(guan)(guan)帽(mao)(mao)(mao)逐漸不(bu)好，但從制造(zao)(zao)難(nan)度(du)上(shang)看(kan)，逐漸好制造(zao)(zao)。