Rexroth力士樂DBEM 10-7X/100XYG24K4M先導(dǎo)式溢流閥
DBEM 型閥門屬于先導(dǎo)式溢流閥。此類閥用于限制液壓系統(tǒng)的工作壓力。根據(jù)電氣控制值的不同，可使用這些閥門對要限制的系統(tǒng)壓力進(jìn)行無級設(shè)置。這些閥門的基本構(gòu)成包括帶有主閥心 (3) 的殼體 (1)、具有壓力限制的疊加閥 (2) 以及比例先導(dǎo)控制閥 (11)。
型號 DBEM...
施加在通道 P 中的壓力作用于主閥芯 (3)。同時(shí)，油口 P 處壓力通過帶噴嘴（4、5）的控制油路（6、7）施加于主閥芯 (3) 的彈簧負(fù)載側(cè)。同時(shí)通過連接孔 (9) 將壓力施加到比例先導(dǎo)控制閥 (11) 的閥架 (10)。先導(dǎo)座 (10) 處液壓力可克服比例電磁鐵 (12) 的控制值相關(guān)力。如果液壓力超過線圈磁力，先導(dǎo)座 (10) 將會打開。此時(shí)先導(dǎo)油即可通過控制油路 (13) 流向油口 Y (14) 以及油箱；因此控制油路（6、7）上的主閥芯 (3) 處將會產(chǎn)生壓降。釋放從油口 P 到 T 的連接。主閥芯 (3) 可控制油口 P 處的設(shè)定工作壓力。由于液壓保護(hù)可防止出現(xiàn)不允許的高壓值，因此已集成彈簧負(fù)載溢流閥 (2)。此壓力限制為基于相關(guān)壓力等級進(jìn)行的預(yù)設(shè)值（請參閱表格第 6 頁）。在閥門工作范圍內(nèi)，彈簧 (16) 可將閥架 (15) 固定于閥座 (17)，并且閥芯由此關(guān)閉。如果主閥芯 (3) 彈簧腔處壓力超過閥門的允許調(diào)定壓力，則閥架 (15) 將貼緊壓縮彈簧 (16)，并且與彈簧室的連接將打開。先導(dǎo)油通過油口 Y (14) 流入油箱。由于存在控制油路（6、7），在主閥芯 (3) 處產(chǎn)生了壓降。釋放從油口 P 到 T 的連接。主閥芯 (3) 控制油口 P 處設(shè)定的工作壓力。必要時(shí)還可通過調(diào)節(jié)元件 (19) 減小預(yù)設(shè)壓力。油口 Y (14) 必須從外部管式連接至油箱。需在卸壓后連接油箱。可通過油口 X (18) 對閥門進(jìn)行卸載或限制壓力。
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