引起扭(niu)曲(qu)損傷的(de)(de)(de)原(yuan)因(yin)很多，其(qi)中的(de)(de)(de)是由于活塞(sai)、活塞(sai)桿和(he)缸筒的(de)(de)(de)間隙不(bu)(bu)均勻(yun)、自(zi)動(dong)化(hua)o型圈(quan)(quan)(quan)裝(zhuang)配機(ji)(ji)偏(pian)心過大、O形(xing)(xing)圈(quan)(quan)(quan)斷(duan)面直徑(jing)不(bu)(bu)均勻(yun)等(deng)造成，由于造成O形(xing)(xing)圈(quan)(quan)(quan)在(zai)(zai)一周多受的(de)(de)(de)摩(mo)擦(ca)力不(bu)(bu)均勻(yun)，自(zi)動(dong)化(hua)o型圈(quan)(quan)(quan)裝(zhuang)配機(ji)(ji)O形(xing)(xing)圈(quan)(quan)(quan)的(de)(de)(de)某些部分摩(mo)擦(ca)過大，發生扭(niu)曲(qu)。通(tong)常(chang)，斷(duan)面尺寸較小的(de)(de)(de)O形(xing)(xing)圈(quan)(quan)(quan)，容(rong)易(yi)產生摩(mo)擦(ca)不(bu)(bu)均勻(yun)。造成扭(niu)曲(qu)（運動(dong)用(yong)O形(xing)(xing)圈(quan)(quan)(quan)比(bi)固定(ding)用(yong)O形(xing)(xing)圈(quan)(quan)(quan)的(de)(de)(de)斷(duan)面直徑(jing)大就是這(zhe)個道理。）另(ling)外，自(zi)動(dong)化(hua)o型圈(quan)(quan)(quan)裝(zhuang)配機(ji)(ji)由于密封溝槽存在(zai)(zai)著同軸(zhou)度偏(pian)差，密封高(gao)度不(bu)(bu)相等(deng)以及O形(xing)(xing)圈(quan)(quan)(quan)截面直徑(jing)不(bu)(bu)均勻(yun)等(deng)現(xian)象，自(zi)動(dong)化(hua)o型圈(quan)(quan)(quan)裝(zhuang)配機(ji)(ji)可能使得O形(xing)(xing)圈(quan)(quan)(quan)的(de)(de)(de)一部分壓(ya)縮(suo)過大，另(ling)一部分過小或不(bu)(bu)受壓(ya)縮(suo)。當溝槽存在(zai)(zai)偏(pian)心即(ji)同軸(zhou)偏(pian)差大于O形(xing)(xing)圈(quan)(quan)(quan)的(de)(de)(de)壓(ya)縮(suo)量時，密封會完全失效(xiao)

石(shi)棉(mian)(mian)(mian)橡(xiang)(xiang)(xiang)膠(jiao)墊(dian)(dian)(dian)片(pian)(pian)以(yi)石(shi)棉(mian)(mian)(mian)纖維、橡(xiang)(xiang)(xiang)膠(jiao)為主要原料再輔(fu)以(yi)橡(xiang)(xiang)(xiang)膠(jiao)配合(he)(he)劑和填(tian)充料，自(zi)(zi)(zi)動化(hua)o型圈(quan)裝(zhuang)配機(ji)(ji)經過混合(he)(he)攪拌、熱輥成型、硫化(hua)等(deng)工(gong)序(xu)制成。石(shi)棉(mian)(mian)(mian)橡(xiang)(xiang)(xiang)膠(jiao)墊(dian)(dian)(dian)片(pian)(pian)根(gen)據其配方、工(gong)藝性能及用途的不(bu)同(tong)，可分為普(pu)通(tong)石(shi)棉(mian)(mian)(mian)橡(xiang)(xiang)(xiang)膠(jiao)墊(dian)(dian)(dian)片(pian)(pian)和耐油石(shi)棉(mian)(mian)(mian)橡(xiang)(xiang)(xiang)膠(jiao)墊(dian)(dian)(dian)片(pian)(pian)。自(zi)(zi)(zi)動化(hua)o型圈(quan)裝(zhuang)配機(ji)(ji)根(gen)據使用的溫度和壓(ya)(ya)力(li)不(bu)同(tong)可以(yi)分為低(di)壓(ya)(ya)石(shi)棉(mian)(mian)(mian)橡(xiang)(xiang)(xiang)膠(jiao)墊(dian)(dian)(dian)片(pian)(pian)，自(zi)(zi)(zi)動化(hua)o型圈(quan)裝(zhuang)配機(ji)(ji)中壓(ya)(ya)石(shi)棉(mian)(mian)(mian)橡(xiang)(xiang)(xiang)膠(jiao)墊(dian)(dian)(dian)片(pian)(pian)和高壓(ya)(ya)石(shi)棉(mian)(mian)(mian)橡(xiang)(xiang)(xiang)膠(jiao)墊(dian)(dian)(dian)片(pian)(pian)。適用于水、水蒸氣、油類、溶(rong)劑、中等(deng)酸(suan)自(zi)(zi)(zi)動化(hua)o型圈(quan)裝(zhuang)配機(ji)(ji)、堿的密(mi)封，石(shi)棉(mian)(mian)(mian)墊(dian)(dian)(dian)片(pian)(pian)主要應用在中、低(di)壓(ya)(ya)法(fa)蘭(lan)連接的密(mi)封中

O型密封(feng)圈與其(qi)他型式密封(feng)圈比較(jiao)，自動化(hua)o型圈裝配機(ji)具有以下優點(dian)：

--適合多(duo)種密封形式：靜態(tai)密封、動態(tai)密封

適(shi)合(he)各種用途(tu)材料(liao)，尺(chi)寸(cun)和溝(gou)槽都已標準化，互換(huan)性(xing)強

--適合(he)多種運(yun)動方式(shi)：旋轉(zhuan)運(yun)動、自動化o型圈裝配(pei)機(ji)軸向往復運(yun)動或組(zu)合(he)運(yun)動（例如旋轉(zhuan)往復組(zu)合(he)運(yun)動）

--適合多種不同的(de)密封介質(zhi)：油(you)、水(shui)、氣、自(zi)動化(hua)o型圈裝(zhuang)配機化(hua)學介質(zhi)或其(qi)它混合介質(zhi)

通過選用(yong)合適(shi)的橡膠材(cai)料(liao)和(he)適(shi)當的配(pei)(pei)方設計，自動化(hua)o型圈(quan)(quan)裝配(pei)(pei)機實現(xian)對(dui)油、水、空(kong)氣、煤氣及各種(zhong)化(hua)學介質(zhi)有效的密(mi)封(feng)作(zuo)用(yong)。溫度使用(yong)范圍廣(guang)（－60℃～+220℃）自動化(hua)o型圈(quan)(quan)裝配(pei)(pei)機，固定使用(yong)時壓力(li)可(ke)達1500Kg/cm2(與(yu)補強環并用(yong))。