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DBDS10P1A/200板式溢流閥

直動(dòng)式溢流閥

調(diào)壓范圍:在規(guī)定的范圍內(nèi)調(diào)節(jié)時(shí)，閥的輸出壓力能平穩(wěn)的升降，無(wú)突跳或遲滯現(xiàn)象。

壓力流量特性:

溢流閥的進(jìn)口壓力隨流量變化而波動(dòng)的性能;又稱為啟閉特性。

(p;-Pk)、(p;-Pp) 稱為調(diào)壓偏差，調(diào)壓偏差小好

nk=P/p。稱為開(kāi)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(dāng)調(diào)壓彈簧預(yù)壓縮量等于零或主閥上腔經(jīng)遙控口直接接回油箱時(shí)，流經(jīng)閥的流量為額定值時(shí)，溢流閥的進(jìn)口壓力。壓力損失略高于卸載壓力。

流量控制閥利用調(diào)節(jié)閥芯和閥體間的節(jié)流口面積和它所產(chǎn)生的局部阻力對(duì)流量進(jìn)行調(diào)節(jié)，從而控制執(zhí)行元件的運(yùn)動(dòng)速度。流量控制閥按用途分為種。節(jié)流閥在調(diào)定節(jié)流口面積后，能使載荷壓力變化不大和運(yùn)動(dòng)均勻性要求不高的執(zhí)行元件的運(yùn)動(dòng)速度基本上保持穩(wěn)定。調(diào)速閥在載荷壓力變化時(shí)能保持節(jié)流閥的進(jìn)出口壓差為定值。這樣，在節(jié)流口面積調(diào)定以后，不論載荷壓力如何變化，調(diào)速閥都能保持通過(guò)節(jié)流閥的流量不變，從而使執(zhí)行元件的運(yùn)動(dòng)速度穩(wěn)定。分流閥不論載荷大小，能使同一油源的兩個(gè)執(zhí)行元件得到相等流量的為等量分流閥或同步閥；得到按比例分配流量的為比例分流閥。集流閥作用與分流閥相反，使流入集流閥的流量按比例分配。

DBDS10P1A/200板式溢流閥

DBD 型泄壓閥是直動(dòng)式座閥。它們用于限制系統(tǒng)壓力。

閥門(mén)主要由套筒 (1)、彈簧 (2)、帶阻尼活塞的提升閥 (3)（壓力等級(jí) 25 bar … 400 bar）或球閥 (4)（壓力等級(jí) 630 bar）和調(diào)節(jié)類(lèi)型 (5) 組成。系統(tǒng)壓力可通過(guò)調(diào)節(jié)類(lèi)型 (5) 進(jìn)行無(wú)級(jí)設(shè)置。彈簧 (2) 將提升閥 (3) 或球 (4) 推到閥座上。通道 P 連接到系統(tǒng)。系統(tǒng)中存在的壓力作用在提升閥表面（或球體）上。如果通道 P 中的壓力超過(guò)彈簧 (2) 上設(shè)置的值，則提升閥 (3) 或球 (4) 會(huì)逆著彈簧 (2) 打開(kāi)。現(xiàn)在，液壓油從通道 P 流入通道 T。提升閥 (3) 的行程受到壓花 (6) 的限制。

為了在整個(gè)壓力范圍內(nèi)實(shí)現(xiàn)良好的壓力調(diào)節(jié)，整個(gè)壓力范圍分為7個(gè)壓力等級(jí)。一個(gè)壓力等級(jí)對(duì)應(yīng)于某個(gè)彈簧，用于可通過(guò)該彈簧設(shè)置的較大工作壓力。

注意事項(xiàng)：

調(diào)整類(lèi)型 (5) 的構(gòu)造使其不會(huì)丟失。由于萬(wàn)向節(jié)安裝，在完全卸載的情況下，調(diào)整類(lèi)型 (5) 中的調(diào)整元件保持松動(dòng)（可移動(dòng)）。

壓力等級(jí)“25”：如果在完全卸載的調(diào)節(jié)類(lèi)型下，較小壓力仍未穩(wěn)定，則由于彈簧和/或恢復(fù)力較低，調(diào)節(jié)元件必須“拉回”到止擋位置。

為了調(diào)整/增加壓力，然后可以再次擰入調(diào)整元件。

類(lèi)型 DBDS..K1X/…

版本壓力等級(jí) 25 … 400 bar（提升座閥）

DBDS10P1A/200板式溢流閥型號(hào)

R900424155 DBDS10P1X/100

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R900915874 DBDS10P1X/200-125

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R900424162 DBDS15G1X/100

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R900949643 DBDS20G1X/190B

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R900932634 DBDS20G1X/200-110

R900959211 DBDS20G1X/200-150

R901434068 DBDS20G1X/200-160

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減壓閥減壓過(guò)程如下，當(dāng)高壓油從進(jìn)油口P流入，經(jīng)閥體與閥芯之間形成的狹縫A而由減壓出油口流出時(shí)，產(chǎn)生了局部壓力損失，因此減壓后的壓力，即出油口油壓P低于進(jìn)油壓力p,并且開(kāi)口量越小，壓降越大，出口油壓力P越低，這就是減壓閥能夠降低系統(tǒng)壓力的原因，即減壓閥的減壓原理。當(dāng)出口油壓P低于彈簧壓力時(shí)，閥芯下腔油壓與彈簧力相等相等，這時(shí)閥芯在彈簧的作用下，處于較下位置，開(kāi)口量A變大，油液流經(jīng)狹縫時(shí)壓力損失減小，出口油壓P因而上升，直至上升到彈簧的調(diào)定值。見(jiàn)圖當(dāng)壓力繼續(xù)升高，P口液壓油通過(guò)控制油道a到閥芯的下端，關(guān)小A的開(kāi)度直至關(guān)閉，此時(shí)P口不再有壓力油流出。