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                                                                                                                                氨用波紋管截止閥試驗標準

                                                                                                                                * 來源: http://www.javnevesti.com * 作者: 美國依洛克YLOK進口閥門 * 發表時間: 2020-07-25 17:45:52 * 瀏覽: 199

                                                                                                                                氨用波紋管截止閥啟閉件是塞形的閥瓣,密封面呈平面或錐面,閥瓣沿流體的中心線作直線運動。閥桿的運動形式:升降旋轉桿式(手輪與閥桿一起旋轉升降,螺母設在閥體上)。截止閥只適用于全開和全關。

                                                                                                                                氨用波紋管截止閥要求達到以強制密封面不泄漏,結構上要注意了防火要求。填料采用聚四氟乙烯,密封可靠、絕對物外漏。密封副材料采用聚四氟乙烯或尼龍對閥體本體材料,為軟密封,密封可靠。該閥適用于氨氣儲罐、液化石油氣管路系統作為啟閉裝置,也適用于其他溫度≤80℃的管路。

                                                                                                                                氨用波紋管截止閥工作原理:

                                                                                                                                氨用波紋管截止閥的閥桿軸線與閥座密封面垂直。閥桿開啟或關閉行程相對較短,并具有非??煽康那袛鄤幼?,使得這種閥門非常適合作為介質的切斷或調節及節流使用。

                                                                                                                                在氨用進口波紋管截止閥由全開位置開始關閉的階段,隨著閥瓣的下降,流體在閥瓣前后造成壓差,以阻止閥瓣下降,而且這個阻力隨閥瓣下降而迅速增加。當截止閥全關時,閥瓣前后壓差等于介質工作壓力,這時阻力*大。再加以強制的密封力,使截止閥關閉瞬間的操作力增加很快。在閥門開啟過程中,由于介質壓力或閥瓣前后壓差造成的推力都是幫助開啟閥門的。應該指出的是,在開閥瞬間的力矩有可能超過關閥時的力矩,因為此時要克服較大的靜摩擦力。

                                                                                                                                氨用波紋管截止閥試驗方法

                                                                                                                                1,壓力試驗:氨截止閥的殼體強度和密封性能試驗按JB/T9092的規定。

                                                                                                                                2,閥體壁厚測量:用測厚儀或專用卡尺測量閥體流道、中腔和閥蓋部位的壁厚。

                                                                                                                                3,閥桿直徑測量:用游標卡尺測量與填料接觸區域的閥桿直徑及閥桿螺紋的直徑。                         

                                                                                                                                4,材料成分分析:在閥體、閥蓋和閥瓣的本體材料上取樣,鉆屑取樣應在表面6.5mm之下處。                

                                                                                                                                5,閥體力學性能:用閥體同爐號、同批熱處理的試棒上按GB/T228規定的方法進行。

                                                                                                                                6,靜壓壽命試驗:采用干燥空氣、在額定壓差下,按JB/T8859的方法進行壽命試驗。

                                                                                                                                7,閥體標志檢查:目測進口氨用閥門(氨用截止閥)表面鑄造或打印標志內容。

                                                                                                                                8,銘牌內容檢查:目測閥門(氨氣截止閥)銘牌上打印標志內容。   
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