Rexroth力士樂DAW 10 A2-5X/200-17Y6EG24N9K4先導式壓力截止閥
型號 DAW…FS…（可自由調節的切換壓差）
DAW 型壓力閥是一種先導式壓力截止閥。例如，它用于蓄能器充液油路。此時，蓄能器中將充入液壓油直至達到蓄能器充液壓力為止。達到蓄能器壓力后，閥門會將流量切換到卸壓油路直至液壓系統中的壓降達到切換壓差為止。然后，再次開始充液過程。
壓力截止閥通常由主殼體 (1)、先導控制閥（2 和 3）、主閥心 (4) 和單向閥 (7) 組成。
將泵流量從 P 至 B 切換為 P 至 T。 ?
泵通過單向閥 (7) 向液壓系統（P 至 A）供油。施加在通道 A 中的壓力通過控制油路 (8) 作用于先導控制閥 (3) 中的控制閥芯。同時，通道 P 中的壓力通過噴嘴 (5) 施加于主閥芯 (4) 的彈簧負載側，并通過控制油路 (9) 作用在擰入式插裝閥 (3) 的入口 (11) 處。當在擰入式插裝閥 (3) 中通過調節主軸 (12) 設置的截止壓力到達液壓系統時，擰入式插裝閥將打開從主閥芯 (4) 的彈簧負載側到回油管路 (10) 再從內部進入 T（型號 DAW ...）的連接或通過油口 Y 從外部進入油箱（型號 DAW ...Y）的連接。
由于存在噴嘴 (5)，在主閥芯 (4) 處產生了壓降。主閥芯將升離閥座，打開 P 至 T 的連接。單向閥 (7) 將關閉 P 至 A 的連接。執行機構壓力 A 將使擰入式插裝閥 (3) 保持在打開位置。
將泵流量從 P 至 T 切換為 P 至 A。 ?
如果執行機構壓力 A 下降至在調節主軸 (14) 處設定的壓力值，則擰入式插裝閥 (3) 將切換到初始位置，并關閉從主閥芯 (4) 的彈簧負載側到回油管路 (10) 的連接。這樣，主閥芯 (4) 彈簧負載側的壓力將會增加，而從 P 到 T 的連接將被壓縮彈簧 (6) 關閉。泵再次通過單向閥 (7) 向液壓系統，即從 P 到 A 供油。
型號“FSB07”
此閥的噴嘴位于控制油路 (11) 中，以用于潛在的換向沖擊衰減。這樣，油路壓力（P 至 T）將增加。請參閱特性曲線。
注意！
僅限間接壓力限制功能：?
泵壓力（至油箱）的壓力限制功能不是直接提供的，而是僅通過到通道 T 的單向閥 (7)、控制油路 (8) 和先導控制閥 (2) 間接提供。
設置切換壓差?
出廠時，閥門被設置為切換壓差約為公稱壓力的 10 % 至 12 %�？梢栽O置為公稱壓力的 50 %。
交付時，調節主軸 (12) 將被擰出并設置為最小可調節切換壓力。
通過擰入調節主軸 (12)，可增大頂部切換壓力。
通過調節主軸 (14) 可調節切換壓差：擰出減小，擰入增加。
通過鎖緊螺釘 (13) 和鎖緊螺母 (15) 確保壓力調節。
不同的系統條件（尤其泵流量和執行機構流量很高時）可能導致比特性曲線中所示更高的切換壓力。在這里，通過此閥可以選擇性地調節系統切換壓差。
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