常見液(ye)壓(ya)密封(feng)件(jian)(jian)(jian)的(de)種類與選用：液(ye)壓(ya)缸(gang)常用的(de)液(ye)壓(ya)密封(feng)件(jian)(jian)(jian)主要有O型密封(feng)圈，唇形(xing)密封(feng)件(jian)(jian)(jian)和(he)組(zu)合密封(feng)件(jian)(jian)(jian)。

　　一、O型密封圈(O型圈)

　　O型密封圈截面為O型，形狀簡單，材(cai)質為橡膠，耐磨(mo)性能(neng)不如聚氨(an)酯，所以(yi)在液(ye)壓系統中主要用于靜密封。

　　二、唇形密封件

　　U型(xing)(xing)密(mi)(mi)(mi)封(feng)圈：U型(xing)(xing)密(mi)(mi)(mi)封(feng)圈的密(mi)(mi)(mi)封(feng)性(xing)能較好(hao)，但單獨使(shi)用(yong)是易翻滾，U型(xing)(xing)密(mi)(mi)(mi)封(feng)圈摩擦阻力(li)較大并隨(sui)工(gong)作壓力(li)的升高而增大。因此U型(xing)(xing)密(mi)(mi)(mi)封(feng)圈僅適宜于工(gong)作壓力(li)較低或運動速度(du)較低的液壓缸采用(yong)。

　　V型(xing)(xing)(xing)密(mi)(mi)(mi)封(feng)(feng)圈(quan)(quan)：V型(xing)(xing)(xing)密(mi)(mi)(mi)封(feng)(feng)圈(quan)(quan)須(xu)配合支(zhi)承環和壓環使用，V型(xing)(xing)(xing)密(mi)(mi)(mi)封(feng)(feng)圈(quan)(quan)的(de)密(mi)(mi)(mi)封(feng)(feng)性能較好(hao)，可(ke)根據工作壓力(li)的(de)大小來確(que)定所用密(mi)(mi)(mi)封(feng)(feng)圈(quan)(quan)的(de)數目，通過壓環調整可(ke)以補償密(mi)(mi)(mi)封(feng)(feng)圈(quan)(quan)的(de)磨損，V型(xing)(xing)(xing)密(mi)(mi)(mi)封(feng)(feng)圈(quan)(quan)缺點是結構復雜，其(qi)摩擦阻力(li)較大。因此V型(xing)(xing)(xing)密(mi)(mi)(mi)封(feng)(feng)圈(quan)(quan)僅適宜于運動速度較低而工作壓力(li)較高(gao)的(de)液壓缸采(cai)用。

　　YX型(xing)(xing)(xing)(xing)密(mi)封(feng)(feng)(feng)(feng)圈(quan)(quan)：YX型(xing)(xing)(xing)(xing)密(mi)封(feng)(feng)(feng)(feng)圈(quan)(quan)是(shi)截(jie)面(mian)寬(kuan)度(du)與之高(gao)度(du)比大于(yu)(yu)2，并且基(ji)于(yu)(yu)對使用(yong)(yong)(yong)穩定性的(de)要求，YX型(xing)(xing)(xing)(xing)密(mi)封(feng)(feng)(feng)(feng)圈(quan)(quan)的(de)工作唇(chun)短(duan)于(yu)(yu)非(fei)工作唇(chun)，由此(ci)分為孔用(yong)(yong)(yong)YX型(xing)(xing)(xing)(xing)密(mi)封(feng)(feng)(feng)(feng)圈(quan)(quan)和軸用(yong)(yong)(yong)YX型(xing)(xing)(xing)(xing)密(mi)封(feng)(feng)(feng)(feng)圈(quan)(quan)，YX型(xing)(xing)(xing)(xing)密(mi)封(feng)(feng)(feng)(feng)圈(quan)(quan)使用(yong)(yong)(yong)時不會(hui)翻滾，所以YX型(xing)(xing)(xing)(xing)密(mi)封(feng)(feng)(feng)(feng)圈(quan)(quan)適宜于(yu)(yu)高(gao)壓(ya)、高(gao)速的(de)液(ye)壓(ya)缸選用(yong)(yong)(yong)。

　　三、組合密封件

　　蕾形(xing)圈：蕾形(xing)圈是由合成橡膠質(zhi)的(de)(de)(de)(de)O型(xing)密(mi)(mi)封(feng)(feng)圈與夾布橡膠質(zhi)的(de)(de)(de)(de)Y型(xing)密(mi)(mi)封(feng)(feng)圈的(de)(de)(de)(de)疊加構(gou)成的(de)(de)(de)(de)，依(yi)靠自身的(de)(de)(de)(de)變形(xing)對密(mi)(mi)封(feng)(feng)表(biao)面產生較高的(de)(de)(de)(de)初(chu)始(shi)(shi)接觸(chu)(chu)應力，阻止無壓力液體(ti)的(de)(de)(de)(de)泄漏(lou)。液壓缸工作時，壓力油(you)使(shi)O型(xing)密(mi)(mi)封(feng)(feng)圈的(de)(de)(de)(de)彈性變形(xing)，始(shi)(shi)終擠(ji)壓和撐開Y型(xing)密(mi)(mi)封(feng)(feng)圈的(de)(de)(de)(de)密(mi)(mi)封(feng)(feng)唇部，使(shi)之(zhi)緊貼密(mi)(mi)封(feng)(feng)表(biao)面，并與初(chu)始(shi)(shi)接觸(chu)(chu)應力一起(qi)共同阻止壓力油(you)的(de)(de)(de)(de)泄漏(lou)。

　　格(ge)(ge)(ge)萊圈(quan)(quan)：格(ge)(ge)(ge)萊圈(quan)(quan)是由O型(xing)(xing)橡膠密(mi)(mi)封(feng)(feng)圈(quan)(quan)與(yu)填充聚四(si)氟乙烯(xi)質的(de)方型(xing)(xing)密(mi)(mi)封(feng)(feng)圈(quan)(quan)的(de)疊加使用構(gou)成的(de)，格(ge)(ge)(ge)來(lai)圈(quan)(quan)可分為孔用格(ge)(ge)(ge)來(lai)圈(quan)(quan)和軸(zhou)用格(ge)(ge)(ge)來(lai)圈(quan)(quan)，但它們的(de)密(mi)(mi)封(feng)(feng)機理是一(yi)樣的(de)，依其本身的(de)變形對密(mi)(mi)封(feng)(feng)表(biao)面(mian)產生較高的(de)初始接觸應(ying)力，阻止(zhi)無壓(ya)(ya)力液體的(de)泄漏。液壓(ya)(ya)缸(gang)工(gong)作時(shi)，壓(ya)(ya)力油使O型(xing)(xing)密(mi)(mi)封(feng)(feng)圈(quan)(quan)的(de)彈(dan)性變形擠(ji)壓(ya)(ya)方型(xing)(xing)密(mi)(mi)封(feng)(feng)圈(quan)(quan)，使之緊貼密(mi)(mi)封(feng)(feng)表(biao)面(mian)，并與(yu)初始接觸應(ying)力一(yi)起共同阻止(zhi)壓(ya)(ya)力油的(de)泄漏。

　　斯(si)特(te)封(feng)(feng)(feng)(feng)(feng)(feng)：斯(si)特(te)封(feng)(feng)(feng)(feng)(feng)(feng)結構與格(ge)(ge)來圈(quan)(quan)(quan)相似，也是由(you)O型橡(xiang)膠密封(feng)(feng)(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)與填充聚四氟乙烯質的(de)(de)特(te)殊(shu)形(xing)狀矩形(xing)或梯(ti)形(xing)的(de)(de)密封(feng)(feng)(feng)(feng)(feng)(feng)圈(quan)(quan)(quan)所組成的(de)(de)，斯(si)特(te)封(feng)(feng)(feng)(feng)(feng)(feng)與格(ge)(ge)來圈(quan)(quan)(quan)一(yi)樣可分為孔用(yong)斯(si)特(te)封(feng)(feng)(feng)(feng)(feng)(feng)和軸(zhou)用(yong)斯(si)特(te)封(feng)(feng)(feng)(feng)(feng)(feng)，斯(si)特(te)封(feng)(feng)(feng)(feng)(feng)(feng)的(de)(de)密封(feng)(feng)(feng)(feng)(feng)(feng)作用(yong)及密封(feng)(feng)(feng)(feng)(feng)(feng)機理與格(ge)(ge)來圈(quan)(quan)(quan)一(yi)樣，但斯(si)特(te)封(feng)(feng)(feng)(feng)(feng)(feng)只具(ju)有單向密封(feng)(feng)(feng)(feng)(feng)(feng)作用(yong)。斯(si)特(te)封(feng)(feng)(feng)(feng)(feng)(feng)和格(ge)(ge)來圈(quan)(quan)(quan)共同特(te)點是填充聚四氟乙烯質材質，摩(mo)擦力小，無爬(pa)行，壽命(ming)長。