電液換向閥H-4WEH25E6X/6EG24N9ES2K4/B10D3

電液換向閥R900719057 H-4WEH25E6X/6EG24N9ES2K4/B10D3

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換向閥是具有兩種以上流動形式和兩個以上油口的方向控制閥。是實現(xiàn)液壓油流的溝通、切斷和換向，以及壓力卸載和順序動作控制的閥門。

雙向換向閥

可分為手動換向閥、電磁換向閥、電液換向閥等。

又稱克里斯閥，閥門的一種，具有多向可調(diào)的通道，可適時改變流體流向。

工作時借著閥外的驅(qū)動傳動機構(gòu)轉(zhuǎn)動驅(qū)動軸，帶動搖拐臂，啟動閥板，使工作流體時而從左入口通向閥的下部出口，時而從右入口變換通向下部出口，實現(xiàn)了周期變換流向的目的。

這種變換閥在石油、化工生產(chǎn)中有著應(yīng)用，在合成氨造氣系統(tǒng)中為常用。此外，換向閥還可作成閥瓣式的結(jié)構(gòu)，多用于較小流量的場合。工作時只需轉(zhuǎn)動手輪通過閥瓣來變換工作流體的流向。

2工作原理

六通換向閥主要由閥體、密封組件、凸輪、閥桿、手柄和閥蓋等零部件組成(圖1)。閥門由手柄驅(qū)動，通過手柄帶動閥桿與凸輪旋轉(zhuǎn)，凸輪具有定位驅(qū)動與鎖定密封組件的開啟與關(guān)閉功能。手柄逆時針旋轉(zhuǎn)，兩組密封組件分別在凸輪的作用下關(guān)閉下端的兩個通道，上端的兩個通道分別與管道裝置的進口相通。反之，上端的兩個通道關(guān)閉，下端兩個通道與管道裝置的進口相通，實現(xiàn)了不停車換向。

六通換向閥

1上閥蓋 2手柄 3閥桿 4凸輪 5密封組件 6閥蓋 7閥體

(1)六通閥的閥體由隔板分成兩腔，每腔都有3個通道，中間為進油口，兩端為出油口。閥體為碳鋼板焊結(jié)構(gòu)，體積小，質(zhì)量輕，結(jié)構(gòu)緊湊，提高了材料的利用率，縮短了生產(chǎn)周期，降低了成本。密封面堆焊不銹鋼，防銹耐腐蝕，密封面經(jīng)過精加工后拋光研磨，表面粗糙度Ra≤0.8μm。

(2)六通閥有兩組密封組件。每組密封組件(圖2)由閥瓣、密封圈、調(diào)整塊、調(diào)節(jié)螺釘、夾板和螺栓組成。閥瓣為碳鋼板焊件，設(shè)有加強筋，即增加閥瓣強度又起導(dǎo)向作用，保證每組閥瓣間的同軸度。閥瓣上鑲嵌聚氨脂橡膠圈，該材料具有耐油、耐磨損、性能穩(wěn)定、密封良好和使用壽命長的特點。在凸輪的作用下，密封圈的球面與閥體密封面相接觸產(chǎn)生擠壓彈性變形，達到密封效果。調(diào)整塊和調(diào)節(jié)螺釘在兩組密封組件不能同步到位時可起調(diào)整作用，確保各通道密封性能同步到位。

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