上海韋米機電設(shè)備有限公司

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4WEH16Y7X/6EG24N9ES2K4/B10D3電液換向閥

WEH型

WEH 型閥是一種電動液壓驅(qū)動的方向滑閥。它控制流的開始、停止和方向。方向閥基本上由帶外殼的主閥 (1)、主控制閥芯 (2)、一個或兩個復(fù)位彈簧 (3.1) 和 (3.2) 以及帶有一個或兩個回位彈簧的先導(dǎo)控制閥 (4) 組成。螺線管“a”（5.1）和/或“b”（5.2）。

為了正常運行，液壓系統(tǒng)必須正確放氣。

對于具有 3 個閥芯位置的閥門，主閥中的主控制閥芯 (2) 通過兩個彈簧保持在零位或初始位置，對于具有 2 個閥芯位置的閥門，通過加壓和彈簧保持在零位或初始位置。在初始位置，兩個彈簧腔 (6) 和 (8) 以減壓形式通過先導(dǎo)控制閥 (4) 與油箱連接。通過控制管路 (7)，先導(dǎo)控制閥供應(yīng)先導(dǎo)油。可以在內(nèi)部或外部（通過端口 X 外部）實現(xiàn)供電。在致動先導(dǎo)控制閥，例如螺線管“a”時，先導(dǎo)控制閥芯 (10) 向左移動，因此彈簧腔 (8) 被先導(dǎo)壓力加壓。彈簧室 (6) 保持減壓狀態(tài)。先導(dǎo)壓力作用在主控制閥芯 (2) 的左側(cè)并使其逆著彈簧 (3.1) 移動。

在關(guān)閉電磁閥時，先導(dǎo)控制閥芯 (10) 返回其初始位置（脈沖閥芯除外）。彈簧室 (8) 被卸載到油箱。先導(dǎo)回油在內(nèi)部（通過通道 T）或外部（通過通道 Y）實現(xiàn)�？蛇x的手動超控 (9) 允許在電磁閥不通電的情況下移動先導(dǎo)控制閥芯 (10)。

注意：

彈簧腔 (6) 和 (8) 中的復(fù)位彈簧 (3.1) 和 (3.2) 將主控制閥芯 (2) 保持在中心位置，即使在閥門垂直定位等情況下也沒有先導(dǎo)壓力。

由于設(shè)計原理，內(nèi)部泄漏是閥門固有的，可能會隨著生命周期的增加而增加。

WH型

WH 型閥是帶液壓驅(qū)動的換向滑閥。它控制流的開始、停止和方向。換向閥基本上由閥殼 (1)、主控制閥芯 (2)、一個或兩個回位彈簧 (3.1) 和 (3.2) 組成，這些彈簧回位或彈簧對中的閥門以及導(dǎo)流板 (11) .

主控制閥芯 (2) 由加壓直接驅(qū)動。主控制閥芯 (2) 通過彈簧或加壓保持在零位或初始位置。先導(dǎo)供油和回油是外部的（參見先導(dǎo)供油）。

帶彈簧對中控制閥芯的 4/3 換向閥

在此版本中，主控制閥芯 (2) 由兩個復(fù)位彈簧 (3.1) 和 (3.2) 保持在零位。通過導(dǎo)流板 (11)，彈簧室 (6) 連接到端口 Y，彈簧室 (8) 連接到端口 X。

隨著主控制閥芯 (2) 兩個前側(cè)之一的先導(dǎo)壓力加載，閥芯移動到閥芯位置。在閥門中，所需的端口以這種方式連接。在壓力控制閥芯區(qū)域壓力釋放時，另一側(cè)的彈簧將閥芯返回到零位或初始位置。

WEH…H型

帶有主控制閥芯壓力對中的 4/3 換向閥

主閥中的主控制閥芯 (2) 通過對兩個前端面加壓而保持在零位。一個定心襯套 (12) 靠在外殼上并固定控制閥芯的位置。通過一個正面的壓力釋放，主控制閥芯 (2) 移動到閥芯位置。

卸載的控制閥芯面通過先導(dǎo)控制閥將返回的先導(dǎo)油排入通道 Y（外部）。

注意：

在此版本中，彈簧 (3.1) 和 (3.2) 沒有復(fù)位功能。在減壓條件下和水平安裝時，它們將主控制閥芯 (2) 保持在中心位置。

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。

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減壓閥是通過調(diào)節(jié)，將進口壓力減至某一需要的出口壓力，并依靠介質(zhì)本身的能量，使出口壓力自動保持穩(wěn)定的閥門。從流體力學(xué)的觀點看，減壓閥是一個局部阻力可以變化的節(jié)流元件，即通過改變節(jié)流面積，使流速及流體的動能改變，造成不同的壓力損失，從而達到減壓的目的。然后依靠控制與調(diào)節(jié)系統(tǒng)的調(diào)節(jié)，使閥后壓力的波動與彈簧力相平衡，使閥后壓力在一定的誤差范圍內(nèi)保持恒定。