高性能三偏心雙向硬密封蝶閥的應用-資訊--格業閥門有限公司_鸭脖电竞

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鸭脖电竞

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高性能三偏心雙向硬密封蝶閥的應用

發布時間:2017-11-07 03:14:45   訪問:613

    目前,蝶閥作為一種用來實現管路系統通斷及流量控制的部件,已在石油、化工、冶金、水電等許多領域中得到極為廣泛地應用。在已公知的蝶閥技術中,其密封形式多采用密封結構,密封材料為橡膠、聚四氟乙烯等。由于結構特征的限制,不适應耐高溫、高壓及耐腐蝕、抗磨損等行業。現有一種比較先進的蝶閥是三偏心金屬硬密封蝶閥,閥體和閥座為連體構件,閥座密封表面層堆焊耐溫、耐蝕合金材料。多層軟疊式密封圈固定在閥闆上,這種蝶閥與傳統蝶閥相比具有耐高溫,操作輕便,啟閉無磨擦,關閉時随着傳動機構的力矩增大來補償密封,提高了蝶閥的密封性能及延長使用壽命的優點。但是,這種蝶閥在使用過程中仍然存在以下問題:

    一、由于多層軟硬疊式密封圈固定在閥闆上,當閥闆常開狀态時介質對其密封面形成正面沖刷,金屬片夾層中的軟密封帶受沖刷後,直接影響密封性能。

    二、受結構條件的限制該結構不适應做通徑DN200以下閥門,原因是閥闆整體結構太厚,流阻大。

    三、因三偏心結構的原理,閥闆的密封面與閥座之間的密封是靠傳動裝置的力矩使閥闆壓向閥座。正流狀态時,介質壓力越高密封擠壓越緊。當流道介質逆流時随着介質壓力的增大閥闆與閥座之間的單位正壓力小于介質壓強時,密封開始洩漏。

    本實用新型之目的旨在提供一種零洩漏、啟閉靈活、使用壽命長、耐高溫、高壓、耐腐蝕、抗磨損适用範圍廣的高性能三偏心雙向硬密封蝶閥。

    高性能三偏心雙向硬密封蝶閥,其特征在于:所述閥座密封圈由軟性T形密封環兩側多層不鏽鋼片組成。閥闆與閥座的密封面為斜圓錐結構,在閥闆斜圓錐表面堆焊耐溫、耐蝕合金材料;固定在調節環壓闆之間的彈簧與壓闆上調節螺栓裝配一起的結構。這種結構有效地補償了軸套與閥體之間的公差帶及閥杆在介質壓力下的彈性變形,解決了閥門在雙向互換的介質輸送過程中存在的密封問題。

    采用軟性T型兩側多層不鏽鋼片組成密封圈,具有金屬硬密封和軟密封的雙重優點,無論在低溫和高溫情況下,均具有零滲漏的密封性能。

    試驗證明池正流狀态(介質流動方向與蝶闆轉動方向相同)時,密封面的壓力是傳動裝置的力矩和介質壓力對閥闆的作用産生的。正向介質壓力增大時閥闆斜圓錐表面與閥座密封面擠壓越緊,密封效果越好。

    當逆流狀态時,閥闆與閥座之間的密封靠驅動裝置的力矩使閥闆壓向閥座。随着反向介質壓力的增大,閥闆與閥座之間的單位正壓力小于介質壓強時,調節環的彈簧在 受載後所儲存的變形能補償閥闆與閥座密封面的緊壓力起到自動補償作用。因此本實用新型不像現有的技術那樣,在閥闆上安裝軟硬多層密封圈,而是直接安裝在閥 體上,在壓闆和閥座中間增設調節環是十分理想的雙向硬密封方式。它将可取代閘閥、截止閥及球形閥。


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