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DB20-1-52/315力士樂(lè)溢流閥 德國(guó)進(jìn)口博世力士樂(lè)REXROTH溢流閥 先導(dǎo)式溢流閥

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DB20-1-52/315力士樂(lè)溢流閥

溢流閥

類型:直動(dòng)式、先導(dǎo)式

作用:

(1)在不斷溢流過(guò)程中保持系統(tǒng)壓力恒定，起穩(wěn)壓和溢流作用(p,FP

系統(tǒng)’閥口常開(kāi)) ;

(2)防止液壓系統(tǒng)過(guò)載，起安全保護(hù)作用(p,=1.1~1.2p,max，閥口常閉)

(一)溢流閥的基本結(jié)構(gòu)及其工作原理

1、直動(dòng)式溢流閥

工作原理:

直接利用液壓力與彈簧力相平衡以控制閥芯的啟閉動(dòng)作，從而保證進(jìn)油口壓力基本恒定。

特點(diǎn):

①閥芯所受的液壓力全靠彈簧力平衡，故當(dāng)系統(tǒng)壓力很高時(shí)，彈簧必須很硬，導(dǎo)致結(jié)構(gòu)笨重，調(diào)壓不輕便。一般用于壓力小于2.5MPa的低壓系統(tǒng)中，作安全閥或背壓閥使用。

②由于慣性或負(fù)載的變化，導(dǎo)致q、變化，即開(kāi)口度h的變化，由于k很大，所以p不穩(wěn)定，穩(wěn)壓精度差;

③結(jié)構(gòu)簡(jiǎn)單、便宜，但工作時(shí)易產(chǎn)生振動(dòng)和噪音。

溢流閥是一種液壓壓力控制閥，在液壓設(shè)備中主要起定壓溢流，穩(wěn)壓，系統(tǒng)卸荷和安全保護(hù)作用。溢流閥在裝配或使用中，由于O形密封圈、組合密封圈的損壞，或者安裝螺釘、管接頭的松動(dòng)，都可能造成不應(yīng)有的外泄漏。如果錐閥或主閥芯磨損過(guò)大，或者密封面接觸不良，還將造成內(nèi)泄漏過(guò)大，甚至影響正常工作。

定壓溢流作用：在定量泵節(jié)流調(diào)節(jié)系統(tǒng)中，定量泵提供的是恒定流量。當(dāng)系統(tǒng)壓力加大時(shí)，會(huì)使流量需求減小。此時(shí)溢流閥開(kāi)啟，使多余流量溢回油箱，保證溢流閥進(jìn)口壓力，即泵出口壓力恒定（閥口常隨壓力波動(dòng)開(kāi)啟）。

穩(wěn)壓作用：溢流閥串聯(lián)在回油路上，溢流閥產(chǎn)生背壓，運(yùn)動(dòng)部件平穩(wěn)性增加。

系統(tǒng)卸荷作用：在溢流閥的遙控口串接溢小流量的電磁閥，當(dāng)電磁鐵通電時(shí)，溢流閥的遙控口通油箱，此時(shí)液壓泵卸荷。溢流閥此時(shí)作為卸荷閥使用。

安全保護(hù)作用：系統(tǒng)正常工作時(shí)，閥門關(guān)閉。只有負(fù)載超過(guò)規(guī)定的極限（系統(tǒng)壓力超過(guò)調(diào)定壓力）時(shí)開(kāi)啟溢流，進(jìn)行過(guò)載保護(hù)，使系統(tǒng)壓力不再增加（通常使溢流閥的調(diào)定壓力比系統(tǒng)*工作壓力高10%～20%）。

DB20-1-52/315力士樂(lè)溢流閥

DB 型壓力閥是一種先導(dǎo)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(diào)節(jié)元件的先導(dǎo)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(shí)，該壓力通過(guò)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(fù)載側(cè)和先導(dǎo)控制閥 (2) 中的滾珠 (8)。如果通道 P 中的壓力超過(guò)彈簧 (9) 上設(shè)定的值，則滾珠 (8) 將背向彈簧 (9) 打開(kāi)。相應(yīng)的信號(hào)通過(guò)控制油路 (10) 和 (6) 從通道 P 由內(nèi)部傳出。此時(shí)主閥芯 (3) 彈簧負(fù)載側(cè)的液壓油通過(guò)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(guò)控制油路 (13) 從內(nèi)部流入油箱（對(duì)于型號(hào) DB …），或通過(guò)控制油路 (14) 從外部流入油箱（對(duì)于型號(hào) DB …Y）。噴嘴 (4) 和 (5) 會(huì)導(dǎo)致主閥芯 (3) 出現(xiàn)壓降，從而使通道 P 到通道 T 的連接打開(kāi)。現(xiàn)在，液壓油從通道 P 流到通道 T，同時(shí)維持設(shè)定的工作壓力。

溢流閥可通過(guò)油口“X”(15) 卸載或切換為另一壓力（第二個(gè)壓力等級(jí)）。

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力士樂(lè)REXROTH液壓元件：

力士樂(lè)REXROTH泵：軸向柱塞泵（軸向柱塞定量泵、軸向柱塞變量泵）、外嚙合齒輪泵、內(nèi)嚙合齒輪泵。擺線泵、葉片泵、徑向柱塞泵、電液泵。

力士樂(lè)REXROTH馬達(dá)：徑向柱塞馬達(dá)、軸向柱塞馬達(dá)（軸向柱塞定量馬達(dá)、軸向柱塞變量馬達(dá)）、外嚙合齒輪馬達(dá)。

力士樂(lè)REXROTH開(kāi)/關(guān)閥：?jiǎn)蜗蜷y（止回閥、截止閥、充液閥）、方向閥（方向座閥、方向滑閥、電磁球閥、換向閥、手動(dòng)閥、機(jī)械閥、電磁閥、電液換向閥）、壓力閥（溢流閥、安全閥、減壓閥、壓力截止閥、壓力順序閥）、流量控制閥（節(jié)流閥、流量控制閥、二通流量控制閥）、二通插裝閥（插裝閥、邏輯閥、插裝閥控制蓋板）。

力士樂(lè)REXROTH比例、高頻響和伺服閥：比例方向閥（直動(dòng)式比例方向閥，比例換向閥，電磁比例閥，電液比例閥，先導(dǎo)式比例方向閥）、比例壓力控制閥（比例溢流閥，比例減壓閥）、比例流量控制閥、高頻響方向閥（直動(dòng)式高頻響應(yīng)比例閥，高頻響應(yīng)比例換向閥，高頻響應(yīng)比例方向閥、高頻響應(yīng)電液比例閥，先導(dǎo)式高頻響應(yīng)方向閥）、方向伺服閥（伺服閥，四通伺服方向閥，電液比例伺服閥）、比例插裝閥（比例方向插裝閥、高頻響方向插裝閥，高頻響換向插裝閥）、高頻響比例伺服閥附件（壓力補(bǔ)償器，平衡閥，插頭接線盒，電纜）。

力士樂(lè)REXROTH油路塊和閥板：底板、蓋板、過(guò)渡板、疊加閥板、多站油路塊、模塊化閥板系統(tǒng)、截止閥塊、控制閥塊

力士樂(lè)REXROTH電子元件：閥放大器（比例閥放大器，高響應(yīng)方向閥放大板，伺服閥放大板，插頭式放大器，開(kāi)/關(guān)閥接線盒）、控制值放大器（模擬放大版）、軸調(diào)節(jié)（集成閥，軸控制器，P/Q閥、數(shù)字控制軸、嵌入式控制器，P/Q放大器、模擬定位模塊）、泵控制（軸向柱塞泵數(shù)字式電子控制裝置）、電子元件附件（機(jī)架和板卡插槽，電源和穩(wěn)壓設(shè)備、測(cè)試和維修設(shè)備，監(jiān)測(cè)模塊，連接插頭和電纜，接頭）。

力士樂(lè)REXROTH系統(tǒng)：泵系統(tǒng)（電動(dòng)液壓控制系統(tǒng)，變速泵驅(qū)動(dòng)裝置）。

力士樂(lè)REXROTH液壓站：標(biāo)準(zhǔn)型液壓站、緊湊型液壓站、靜默液壓站、驅(qū)動(dòng)單元、夾緊和驅(qū)動(dòng)模塊、電機(jī)/泵裝配件、蓄能器站、過(guò)濾設(shè)備、液壓站附件（衰減器）。

力士樂(lè)REXROTH傳感器和信號(hào)發(fā)送器：壓力傳感器，電子壓力開(kāi)關(guān)、機(jī)械壓力開(kāi)關(guān)、壓力指示單元（壓力表，充液壓力表）、浮球開(kāi)關(guān)、溫度開(kāi)關(guān)、油處理（顆粒監(jiān)測(cè)器、含水量測(cè)量單元）、速度傳感器、信號(hào)編碼器、斜盤傾角傳感器。

力士樂(lè)REXROTH蓄能器：液壓氣動(dòng)蓄能器（薄模式蓄能器，皮囊式蓄能器，柱塞式蓄能器）、蓄能器站、蓄能器截止塊（蓄能器切斷閥）。

力士樂(lè)REXROTH過(guò)濾器：空氣過(guò)濾器、油箱安裝過(guò)濾器/回油管路過(guò)濾器、嵌入式過(guò)濾器、可通斷的****過(guò)濾器/嵌入式過(guò)濾器、油路塊安裝過(guò)濾器、吸油和替換插件過(guò)濾器、籃式濾網(wǎng)過(guò)濾器、過(guò)濾器材料、過(guò)濾器元件（過(guò)濾器濾芯）、過(guò)濾器附件（過(guò)濾器維護(hù)指示器，密封件）。