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提起檢查閥

升降機檢查閥是一種單向流控制裝置，可以通過中型壓力自動打開和關閉，以防止回流，以廣泛用於工業和民用管道系統。它的核心結構包括閥體，圓盤，座椅和引導機構，在流體壓力和圓盤重力之間的平衡上運行。
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當介質向前流動時，流體壓力克服了圓盤的重力，將其垂直向上推開座椅密封表面，以最小的電阻打開通道。一旦流動停止或逆轉，盤將在重力和背壓下掉落到座椅上，形成緊密的密封以阻止反向流動。該設計確保了圓盤和座椅之間的大密封接觸區域，從而實現了出色的密封性能，符合嚴格的標準，例如ANSI/FCI 70-2級VI級別，以實現接近零的洩漏。
對於材料選擇，閥體通常由鑄鐵，鑄鋼或不銹鋼製成，以適應不同的壓力和溫度條件。圓盤和座椅根據培養基特性使用硬合金，橡膠或PTFE，以增強耐磨性和腐蝕性。例如，在帶有腐蝕介質的石化應用中，不銹鋼身體與PTFE密封表面配對可確保高壓耐藥性和腐蝕保護。在供水系統中，鑄鐵升降機檢查閥為單向水流提供了經濟可靠性。
與搖擺止回閥相比，舉起止回閥可提供更好的密封，但具有更高的流動性。它們還需要嚴格的安裝方向 - 在水平管道或垂直管道上具有向上介質流動的垂直安裝 - 以確保圓盤通過重力正常運行。儘管有這些局限性，它們的出色密封和防迴路預防使它們成為諸如蒸汽管道，泵送插座保護和高層建築供水之類的高密封目標方案的首選選擇，在確保系統安全和穩定操作方面起著至關重要的作用。
June 27, 2025
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