全焊(han)(han)接(jie)球(qiu)閥(fa)的(de)閥(fa)體結(jie)構有兩種，一(yi)種是筒狀(zhuang)結(jie)構，它(ta)(ta)是雙焊(han)(han)縫的(de)，因(yin)為焊(han)(han)接(jie)過程的(de)熱量輸出大，殘余應(ying)力復雜(za)，所以軸向(xiang)和徑向(xiang)的(de)變形(xing)也大。該形(xing)狀(zhuang)的(de)閥(fa)體重(zhong)量重(zhong)，不易運輸，成本高，沒有競(jing)爭優勢(shi)。另一(yi)種是球(qiu)狀(zhuang)結(jie)構，它(ta)(ta)一(yi)般由四條(tiao)焊(han)(han)縫或一(yi)條(tiao)焊(han)(han)縫焊(han)(han)接(jie)而成的(de)，支(zhi)撐方(fang)式分為上下閥(fa)桿(gan)支(zhi)撐和樞軸支(zhi)撐。

隨著熱(re)鍛壓(ya)工藝的(de)進步，球(qiu)狀(zhuang)結構閥體的(de)焊(han)縫只(zhi)有一條(tiao)，焊(han)接(jie)輸出的(de)熱(re)量(liang)小(xiao)，減小(xiao)了變形(xing)，該結構閥體的(de)重量(liang)是筒(tong)狀(zhuang)的(de)1/3，成(cheng)本(ben)低，明顯有競爭優勢。

電(dian)(dian)(dian)(dian)(dian)弧(hu)(hu)(hu)電(dian)(dian)(dian)(dian)(dian)壓(ya)與(yu)電(dian)(dian)(dian)(dian)(dian)弧(hu)(hu)(hu)長度(du)(du)成(cheng)正(zheng)比。在相同(tong)的(de)電(dian)(dian)(dian)(dian)(dian)弧(hu)(hu)(hu)電(dian)(dian)(dian)(dian)(dian)壓(ya)和焊(han)接電(dian)(dian)(dian)(dian)(dian)流時(shi)，如果選用的(de)焊(han)劑不(bu)(bu)同(tong)，電(dian)(dian)(dian)(dian)(dian)弧(hu)(hu)(hu)空(kong)間電(dian)(dian)(dian)(dian)(dian)場(chang)強度(du)(du)不(bu)(bu)同(tong)，則電(dian)(dian)(dian)(dian)(dian)弧(hu)(hu)(hu)長度(du)(du)不(bu)(bu)同(tong)。當(dang)其他條件不(bu)(bu)變時(shi)，電(dian)(dian)(dian)(dian)(dian)弧(hu)(hu)(hu)電(dian)(dian)(dian)(dian)(dian)壓(ya)低，熔深大(da)，焊(han)縫寬度(du)(du)窄，易產生熱(re)裂(lie)紋。電(dian)(dian)(dian)(dian)(dian)弧(hu)(hu)(hu)電(dian)(dian)(dian)(dian)(dian)壓(ya)高(gao)(gao)時(shi)，焊(han)縫寬度(du)(du)增(zeng)加(jia)，余高(gao)(gao)不(bu)(bu)夠。埋弧(hu)(hu)(hu)焊(han)的(de)電(dian)(dian)(dian)(dian)(dian)弧(hu)(hu)(hu)電(dian)(dian)(dian)(dian)(dian)壓(ya)是依據焊(han)接電(dian)(dian)(dian)(dian)(dian)流調整的(de)，即一定焊(han)接電(dian)(dian)(dian)(dian)(dian)流要(yao)保(bao)持一定的(de)弧(hu)(hu)(hu)長才可能(neng)保(bao)證焊(han)接電(dian)(dian)(dian)(dian)(dian)弧(hu)(hu)(hu)的(de)穩定燃燒，所以電(dian)(dian)(dian)(dian)(dian)弧(hu)(hu)(hu)電(dian)(dian)(dian)(dian)(dian)壓(ya)一般為30～33V。

閥(fa)座(zuo)一旦需(xu)要緊急修(xiu)復(fu)，可(ke)(ke)以通(tong)過方式對其進行修(xiu)復(fu)，焊(han)接(jie)(jie)球閥(fa)生產(chan)，而不需(xu)要破(po)壞焊(han)接(jie)(jie)結構。閥(fa)體(ti)(ti)(ti)內部的零件（球、閥(fa)座(zuo)圈等）產(chan)生的靜電通(tong)過彈簧、墊圈向閥(fa)體(ti)(ti)(ti)放電。從操(cao)作(zuo)性角度(du)看，因(yin)有耳軸支撐(cheng)，可(ke)(ke)以用較(jiao)小(xiao)的力進行操(cao)作(zuo)。耳軸部采用摩擦阻力小(xiao)的聚(ju)四(si)氟乙(yi)烯軸承。閥(fa)座(zuo)為浮動閥(fa)座(zuo)，閥(fa)座(zuo)受球擠壓的力相對于流體(ti)(ti)(ti)壓力來說，數值較(jiao)小(xiao)。

維護管理方面，球(qiu)閥(fa)一般不需做維護和保養。萬一密封(feng)部位發(fa)生泄漏，可注入密封(feng)脂進行緊急(ji)修(xiu)復。閥(fa)座(zuo)和閥(fa)桿密封(feng)的緊急(ji)修(xiu)復，使(shi)用IKSS－3L密封(feng)脂。