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在液壓轉(zhuǎn)動、氣動元件與系統(tǒng)中，往復(fù)動密封是一種常見的密封要求。動力缸活塞與缸體、活塞干預(yù)缸蓋以及各類滑閥上都用到往復(fù)運動密封?？p隙由圓柱桿與圓柱孔形成，桿在圓柱孔內(nèi)軸向運動。密封作用限制流體的軸向泄漏。

用作往復(fù)運動密封時，O形圈的預(yù)密封效果和自密封作用與靜密封一樣，并且由于O形圈自身的彈力，而具有磨損后自動補償?shù)哪芰?。但由于液體介質(zhì)密封時，由于桿運動速度、液體的壓力、粘度的作用，情況比靜密封復(fù)雜。

當(dāng)液體在壓力作用下，液體分子與金屬表面互相作用，油液中所含的―極性分子在金屬表面上緊密而整齊的排列，沿滑移面與密封件間形成一個強固的邊界層油膜，并且對滑移面產(chǎn)生的附著力。該液體薄膜始終存在于密封件與往復(fù)運動面之間，它亦起一定的密封作用，并且對運動密封面的潤滑是非常重要的。
力士樂 比例閥 武漢現(xiàn)貨
但是對泄漏來講是有害的。但往復(fù)運動的軸向外拖出時，軸上的液體薄膜便與軸一起拉出，由于密封件的―擦拭作用，當(dāng)往復(fù)運動的軸縮回時，該液體薄膜便被密封元件阻留在外面。隨著往復(fù)運動行程次數(shù)增多，阻留在外面的液體就越多，后形成油滴，這就是往復(fù)運動式密封裝置的泄漏。由于液壓油的粘度隨著溫度的升高而降低，油膜厚度相應(yīng)減小，所以液壓設(shè)備在低溫下啟動時，運動開始時的泄漏較大，隨著運動過程中因各種損失引起溫度升高，泄漏量有逐漸降低的趨勢。O形圈作為往復(fù)式密封，結(jié)構(gòu)緊湊、尺寸小，可以降低元件價格。主要用在:

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