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DB10-1-50B/315力士樂溢流閥由上海韋米機電設備有限公司專業(yè)提供

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DB10-1-50B/315力士樂溢流閥

性能

(1)調壓范圍：它是指減壓閥輸出壓力P2的可調范圍，在此范圍內要求達到規(guī)定的精度。調壓范圍主要與調壓彈簧的剛度有關。

(2)壓力特性：它是指流量g為定值時，因輸入壓力波動而引起輸出壓力波動的特性。輸出壓力波動越小，減壓閥的特性越好。輸出壓力必須低于輸入壓力—定值才基本上不隨輸入壓力變化而變化。

(3)流量特性：它是指輸入壓力—定時，輸出壓力隨輸出流量g的變化而變化的持性。當流量g發(fā)生變化時，輸出壓力的變化越小越好。一般輸出壓力越低，它隨輸出流量的變化波動就越小

溢流閥一般有兩種結構：1、直動型溢流閥 。2、先導式溢流閥。

對溢流閥的主要要求：調壓范圍大，調壓偏差小，壓力振擺小，動作靈敏，過載能力大，噪聲小。

先導型溢流閥的導閥部分結構尺寸較小，調壓彈簧不必很強，因此壓力調整比較輕便。但因先導型溢流閥要在先導閥和主閥都動作后才能起控制作用，因此反應不如直動型溢流閥靈敏。

與三節(jié)同心結構相比，二節(jié)同心結構的特點是：①主閥芯僅與閥套和主閥座有同心度要求，免去了與閥蓋的配合，故結構簡單，加工和裝配方便。②過流面積大，在相同流量的情況下，主閥開啟高度�。换蛘咴谙嗤�開啟高度的情況下，其通流能力大，因此，可做得體積小、重量輕。③主閥芯與閥套可以通用化，便于批量生產。

直動式溢流閥

調壓范圍:在規(guī)定的范圍內調節(jié)時，閥的輸出壓力能平穩(wěn)的升降，無突跳或遲滯現象。

壓力流量特性:

溢流閥的進口壓力隨流量變化而波動的性能;又稱為啟閉特性。

(p;-Pk)、(p;-Pp) 稱為調壓偏差，調壓偏差小好

nk=P/p。稱為開啟壓力比，

np=P/p。稱為閉合壓力比，nk、n,大好。

壓力損失和卸載壓力:當調壓彈簧預壓縮量等于零或主閥上腔經遙控口直接接回油箱時，流經閥的流量為額定值時，溢流閥的進口壓力。壓力損失略高于卸載壓力。

DB10-1-50B/315力士樂溢流閥

DB 型壓力閥是一種先導式溢流閥。用于限制工作壓力。

這些溢流閥 (DB) 主要由帶主閥心 (3) 的主閥 (1) 以及帶壓力調節(jié)元件的先導控制閥 (2) 組成。

施加在通道 P 中的壓力作用于主閥芯 (3)。同時，該壓力通過配有噴嘴 (4) 和 (5) 的控制油路 (6) 和 (7) 施加于主閥芯 (3) 的彈簧負載側和先導控制閥 (2) 中的滾珠 (8)。如果通道 P 中的壓力超過彈簧 (9) 上設定的值，則滾珠 (8) 將背向彈簧 (9) 打開。相應的信號通過控制油路 (10) 和 (6) 從通道 P 由內部傳出。此時主閥芯 (3) 彈簧負載側的液壓油通過控制油路 (7)、噴嘴孔 (11) 和滾珠 (8) 流入彈簧腔 (12)。從此處，液壓油通過控制油路 (13) 從內部流入油箱（對于型號 DB …），或通過控制油路 (14) 從外部流入油箱（對于型號 DB …Y）。噴嘴 (4) 和 (5) 會導致主閥芯 (3) 出現壓降，從而使通道 P 到通道 T 的連接打開�，F在，液壓油從通道 P 流到通道 T，同時維持設定的工作壓力。

溢流閥可通過油口“X”(15) 卸載或切換為另一壓力（第二個壓力等級）。

DB10-1-50B/315力士樂溢流閥供應型號

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減壓閥的出口壓力是用來控制電液換向閥或外控順序閥等的控制油液壓力大小的，當電液換向閥或外控順序閥換向或工作后，減壓閥出油口流量變?yōu)榱�，但壓力還需保持原先調定的壓力。這種情況下，因閥出口流量為零，流經減壓口的流量只有先導流量。由于先導流量很少，一般在2L/min之內，因此主閥減壓口基本上接近全關位置（開度較�。�，先導流量由三角槽或斜錐面處流出，如果主閥芯配合過松或磨損過大，則泄漏量增加。