力士樂安全閥DBDH6P1X/25 R900430378，德國REXROTH安全閥，購買進口液壓、氣動、自動化控制工業配件，認準“上海韋米機電設備有限公司”，7年老店，保證產品原廠原裝，價格優惠，售后無憂，歡迎新老客戶咨詢采購！

先導型溢流閥的特點
先導閥和主閥閥芯分別處于受力平衡，其閥口都滿足壓力流量方程。閥的進口壓力由兩次比較得到，壓力值主要由先導閥調壓彈簧的預壓縮量確定，主閥彈簀起復位作用。
通過先導閥的流量很小，是主閥額定流量的1%因此其尺寸很小，即使是高壓閥，其彈簧剛度也不大。這樣一來閥的調節性能有很大改善。
主閥芯開啟是利用液流流經阻力孔形成的壓力差。阻力孔一般為細長孔，孔徑很小0=0.8~1.2mm,孔長I = 8~12mm,因此工作時易堵塞，一旦堵塞則導致主閥口常開無法調壓。

先導型溢流閥遙控口接法
先導閥前腔有一遙控口，在該控制口接遠程調壓閥可實現遠控，接電磁閥通回油箱可實現卸載。
遠程調壓閥實際上是一個獨立的壓力先導閥，旁接在先導型溢流閥遙控口起遠程調壓作用，其調定壓力必須低于先導閥的調定壓力。無論哪個起作用，泵的溢流量始終經主閥閥口回油箱。

溢流閥的功用
溢流閥旁接在泵的出口，用來保證系統壓力恒定，稱為定壓閥。
溢流閥旁接在泵的出口，用來限制系統壓力的*大值，對系統起保護作用，稱為安全閥。
電磁溢流閥還可以在執行機構不工作時使泵卸載。

直動式溢流閥
調壓范圍:在規定的范圍內調節時，閥的輸出壓力能平穩的升降，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。

減壓閥
減壓閥是利用液流流過縫隙產生壓力損失，使其出口壓力低于進口壓力的壓力控制閥。
按調節要求不同，有定值減壓閥，定差減壓閥，定比減壓閥。
定值減壓閥的結構原理
減壓閥起減壓作用且保證出口壓力為定值的條件是:當出口壓力大于減壓閥的調定壓力，使其先導閥開啟。
直動式減壓閥
減壓閥的功用與特點：
減壓閥用在液壓系統中獲得壓力低于系統壓力的二次油路上
與溢流閥比較:
減壓閥是出口壓力控制，保證出口壓力為定值;溢流閥是進口壓力控制，保證進口壓力為定值。
減壓閥閥口常開;
溢流閥閥口常閉。
減壓閥有單獨的泄油口;溢流閥彈簧腔的泄漏油經閥體
內流道內泄至出口。
減壓閥與溢流閥-樣有遙控口。

順序閥
順序閥是一種利用壓力控制閥口通斷的壓力閥。
按控制油來源不同分內控和外控，按彈簧腔泄漏油引出方式不同分內泄和外泄。
順序閥的四種控制方式
通過改變上蓋或底蓋的裝配位置可得到內控外泄、內控內泄、外控外泄、外控內泄四種類型。
內控外泄順序閥
內控外泄順序閥與溢流閥非常相象:閥口常閉，進口壓力控制，但是該
閥出口油液要去工作，所以有單獨的泄油口。
內控外泄順序閥用于多個執行元件順序動作。其進口壓力先要達到閥的調定壓力，而出口壓力取決于負載。當負載壓力高于閥的調定壓力時，進口壓力等于出口壓力，閥口全開;當負載壓力低于調定壓力時，進口壓力等于調定壓力，閥的開口一定。

內控內泄順序閥與外控順序閥
內控內泄順序閥的圖形符號和工作原理與溢流閥相同。
多串聯在液壓系統的回油路上，使回油具有一定壓力。
外控內泄順序閥等同于二位二通閥，可作卸載閥。
外控外泄順序閥可作液動開關和限速鎖。
壓力繼電器
壓力繼電器是一種將液壓系統的壓力信號轉換為電信號輸出的元件。
其作用是實現執行元件的順序控制或安全保護。
柱塞式壓力繼電器的結構原理


RQM*-P型閥是一種溢流閥，具有三種流量規格，大流量為500 l/min。該閥可選用CETOP 安裝底板。適用該閥由于選用電磁閥的型號不同，可分為5種型式，其具有卸載和3種壓力值選擇功能。二級和三級的壓力值的調節值可通過連接主閥和電磁閥的溢流閥設定。通常供貨時帶六角調整螺釘。若需要還可裝配SICBLOC調整旋鈕調整主壓力。


CRQ型閥是一種插裝式先導壓力控制閥，它可以安裝在具有D-10C閥座孔的集成塊式閥板上。型底座上。該閥通常用于控制液壓閥的壓力，在壓力接近設定值時，仍然可以使泵在滿流量下工作。該閥提供四種壓力調整范圍，大壓力 350 bar。該閥由平衡型主閥和一個先導閥組成。主閥通常處于封閉狀態，當回路壓力超過由先導閥設定的值時，主閥打開，油液通過 T 口直接回油箱。可用調整螺釘改變設定壓力，通常用內六角螺釘，同時裝有鎖緊螺母和大調節限位器。

順序閥是指在具有二個以上分支回路的系統中，根據回路的壓力等來控制執行元件動作順序的閥。該閥還可作為卸荷閥和背壓閥使用。
按工作原理和結構，順序閥分直動式和先導式兩類；按壓力控制方式，順序閥有內控和外控之分。 在順序閥中裝有單向閥，能通過反向液流的復合閥稱為單向順序閥。一般說來，這種閥使用較多。

順序閥的基本功能是控制多個執行元件的順序動作，根據其功能的不同，分別稱為順序閥、背壓閥、卸荷閥和平衡閥。 順序閥的性能與溢流閥基本相同，但由于功能的不同，對順序閥還有其特殊的要求：
（1）為了使執行元件準確實現順序動作，要求順序閥的調壓精度高，偏差小；
（2）為了順序動作的準確性，要求閥關閉時內泄漏量小；
（3）對于單向順序閥，要求反向壓力損失及正向壓力損失值均應較小。 順序閥的主要作用有：
（1）控制多個元件的順序動作；
（2）用于保壓回路；
（3）防止因自重引起油缸活塞自由下落而做平衡閥用；
（4）用外控順序閥做卸荷閥，使泵卸荷；
（5）用內控順序閥作背壓閥。


順序閥根據裝配結構的不同，可以實現不同的回路功能，如溢流閥、順序閥和平衡閥的功能。
順序閥的啟閉特性如果太差，則流量較大時一次壓力過高，回路效率降低。啟閉特性帶有滯環，開啟壓力低于閉合壓力，負載流量變化時應予注意。開啟壓力過低的閥，再壓力低于設定壓力時發生前漏，引起執行器誤動作。通過閥的流量遠小于額定流量時，產生振動或其他不穩定現象。此時要再回路上采取措施。
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R900769507 DBDS10G1X/150E
R900572458 DBDS10G1X/155B
R900572459 DBDS10G1X/160B
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R900429968 DBDS10G1X/170
R900370316 DBDS10G1X/170/5B
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R900423743 DBDS10G1X/25
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R900929857 DBDS10G1X/25-10
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R900351411 DBDS10G1X/25/12
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R900346901 DBDS10G1X/25VW1
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R900424742 DBDS10G1X/315
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R900587502 DBDS10G1X/315SO700
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R900560483 DBDS10G1X/315SO770
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R901213049 DBDS10G1X/315-120
R901117166 DBDS10G1X/315-190
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R900919942 DBDS10G1X/315-220
R900939820 DBDS10G1X/315-220V
R901036708 DBDS10G1X/315-235
R900915091 DBDS10G1X/315-250
R901216827 DBDS10G1X/315-250V
R900771754 DBDS10G1X/315-270
R900724592 DBDS10G1X/315-275
R900911873 DBDS10G1X/315-290V
R900377746 DBDS10G1X/315/12
R900470506 DBDS10G1X/315/5
R901095276 DBDS10G1X/315/59
R900406279 DBDS10G1X/315/V/5
R900424824 DBDS10G1X/315B
R900427241 DBDS10G1X/315B
R900769430 DBDS10G1X/315E
R900474980 DBDS10G1X/315J
R900529736 DBDS10G1X/315J/12
R901052284 DBDS10G1X/315J=TE
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R900977655 DBDS10G1X/315P210
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R901330999 DBDS10G1X/315P230
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R901142782 DBDS10G1X/345E
R900572907 DBDS10G1X/350B
R901010969 DBDS10G1X/350E
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R901004635 DBDS10G1X/360E
R900776416 DBDS10G1X/370E
R900572908 DBDS10G1X/375B
R901419086 DBDS10G1X/375E
R900424744 DBDS10G1X/400
R900340395 DBDS10G1X/400SO32
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R900967544 DBDS10G1X/400-330
R901283265 DBDS10G1X/400-350
R900934571 DBDS10G1X/400-350V
R900558953 DBDS10G1X/400-370
R901243540 DBDS10G1X/400-400
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R900535540 DBDS10G1X/400/2
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R900424799 DBDS10G1X/400B
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R900374117 DBDS10G1X/400JSO73
R901052290 DBDS10G1X/400J=TE
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R901348424 DBDS10G1X/400P350V
R901055558 DBDS10G1X/400P370
R901356605 DBDS10G1X/400P400
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R900979785 DBDS10G1X/440B
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R900424745 DBDS10G1X/50
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R900572968 DBDS10G1X/500B
R900520689 DBDS10G1X/500BSO999
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R900560484 DBDS10G1X/50MT
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R900423814 DBDS10G1X/630
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R900470981 DBDS10G1X/630SO48
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R900496233 DBDS10G1X/700
R900580506 DBDS10G1X/700V
R900572349 DBDS10G1X/70B
R900769413 DBDS10G1X/70E
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R900572350 DBDS10G1X/80B
R900423740 DBDS10G1X/80B
R901002782 DBDS10G1X/80E
R900572351 DBDS10G1X/90B
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R900441883 DBDS10G1A/
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R900364483 DBDS10G1A/100SO130
R900409673 DBDS10G1A/100SO450
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R900916880 DBDS10G1A/100-075/12
R901020245 DBDS10G1A/100-25/59
R901020237 DBDS10G1A/100-30/59
R901005956 DBDS10G1A/100-35
R901156100 DBDS10G1A/100-40
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R901060953 DBDS10G1A/100-55
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R900423746 DBDS10G1A/100B
R900769619 DBDS10G1A/100E
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R901052283 DBDS10G1A/100J=TE
R901307340 DBDS10G1A/100P025
R901307339 DBDS10G1A/100P065
R900935424 DBDS10G1A/100P080
R900424739 DBDS10G1A/100V
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R901233054 DBDS10G1A/105E
R900466366 DBDS10G1A/110/5B
R900423744 DBDS10G1A/110B
R901034804 DBDS10G1A/110E
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R900572454 DBDS10G1A/130B
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R900572455 DBDS10G1A/135B
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R900429968 DBDS10G1A/170
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R900424808 DBDS10G1A/170B
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R900433779 DBDS10G1A/200
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R901229978 DBDS10G1A/210/12E
R900426099 DBDS10G1A/210B
R900769379 DBDS10G1A/210E
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R900772319 DBDS10G1A/220E
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R900572619 DBDS10G1A/230B
R900769565 DBDS10G1A/230E
R901395602 DBDS10G1A/230VE
R900572620 DBDS10G1A/240B
R900783238 DBDS10G1A/240E
R900423743 DBDS10G1A/25
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R900401161 DBDS10G1A/25SO74
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R900929857 DBDS10G1A/25-10
R900930354 DBDS10G1A/25-10V
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R900351411 DBDS10G1A/25/12
R900471709 DBDS10G1A/25/5
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R901012705 DBDS10G1A/250E
R901445518 DBDS10G1A/250VE
R900499604 DBDS10G1A/25J
R901053363 DBDS10G1A/25J=TE
R900903942 DBDS10G1A/25P15
R900423889 DBDS10G1A/25V
R900346901 DBDS10G1A/25VW1
R900340153 DBDS10G1A/25V/12
R900572622 DBDS10G1A/260B
R901309515 DBDS10G1A/260E
R900965654 DBDS10G1A/275B
R901011611 DBDS10G1A/275E
R900572623 DBDS10G1A/280B
R900773229 DBDS10G1A/280E
R900572624 DBDS10G1A/300B
R901124323 DBDS10G1A/300E
R901402828 DBDS10G1A/305E
R900572289 DBDS10G1A/30B
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R900769607 DBDS10G1A/30VE
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R900424742 DBDS10G1A/315
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R900587880 DBDS10G1A/315SO284
R900419721 DBDS10G1A/315SO60
R900587502 DBDS10G1A/315SO700
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R900560483 DBDS10G1A/315SO770
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R900919942 DBDS10G1A/315-220
R900939820 DBDS10G1A/315-220V
R901036708 DBDS10G1A/315-235
R900915091 DBDS10G1A/315-250
R901216827 DBDS10G1A/315-250V
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R900377746 DBDS10G1A/315/12
R900470506 DBDS10G1A/315/5
R901095276 DBDS10G1A/315/59
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R900424824 DBDS10G1A/315B
R900427241 DBDS10G1A/315B
R900769430 DBDS10G1A/315E
R900474980 DBDS10G1A/315J
R900529736 DBDS10G1A/315J/12
R901052284 DBDS10G1A/315J=TE
R900594748 DBDS10G1A/315MKB
R900977655 DBDS10G1A/315P210
R900940050 DBDS10G1A/315P220
R901330999 DBDS10G1A/315P230
R901352219 DBDS10G1A/315P240
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R900938747 DBDS10G1A/315P300
R900424743 DBDS10G1A/315V
R900340488 DBDS10G1A/315V/12
R901124724 DBDS10G1A/315V/12E
R900489852 DBDS10G1A/315VB
R901341414 DBDS10G1A/315VE
R900572904 DBDS10G1A/320B
R901143312 DBDS10G1A/320E
R900572905 DBDS10G1A/330B
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液壓閥的分類:
1根據結構形式分類
滑閥：滑閥為間隙密封，閥芯與閥口存在一定的密封長度，因此滑閥運動存在一個死區。
錐閥：錐閥閥芯半錐角一 般為12°-20°，閥口關閉時為線密封，密封性能好且動作靈敏。
球閥：性能與錐閥相同
2.根據控制制方式不同分:
定值或開關控制閥:被控制量為定值的閥類，包括普通控制閥、插裝閥、疊加閥。
比例控制閥:被控制量與輸入信號成比例連續變化的閥類，包括普通比例閥和帶內反饋的電液比例閥。
伺服控制閥:被控制量與(輸出與輸入之間的)偏差信號成比例連續變化的閥類，包括機液伺服閥和電液伺服閥。.
數字控制閥:用數字信息直接控制閥口的啟閉，來控制液流的壓力、流
量、方向的閥類。
3.根據用途分:
壓力控制閥、流量控制閥、方向控制閥
方向控制閥的作用:在液壓系統中控制液流方向。
方向控制閥包括:單向閥和換向閥
單向閥包括:普通單向閥和液控單向閥
1.普通單向閥
使油液只能沿一個方向流動，反向則被截止的方向閥。
普通單向閥的應用
常被安裝在泵的出口，一方面防止壓力沖擊影響泵的正常工作，另一方面防止泵不工作時系統油液倒流經泵回油箱。
被用來分隔油路以防止高低壓干擾。:
與其他的閥組成單向節流閥、單向減壓閥、單向順序閥等復合閥。
安裝在執行元件的回油路上，使回油具有一定背壓。作背壓閥的單向閥應更換剛度較大的彈簧，其正向開啟壓力為( 0. 3~0.5) MPa。
2.液控單向閥
外泄式液控單向閥，內泄式單向閥
工作原理:當控制油口不通壓力油時，油液只能從pi→P:當控制油口通壓力油時，正、反向的油液均可自由通過。
3.換向閥
換向閥是利用閥芯在閥體孔內作相對運動，使油路接通或切斷而改變油流方向的閥。
換向閥的分類
按結構形式可分:滑閥式、轉閥式、球閥式。
按閥體連通的主油路數可分:兩通、三通、四通...等。
按閥芯在閥體內的工作位置可分:兩位、三位、四位等。
按操作閥芯運動的方式可分:手動、機動、電磁動、液動、電液動等。
換向閥的中位機能，多位閥在不同工作位置時，各油口的連通方式體現了換向閥的不同的控制機能，稱之為換向閥的機能。對于三位閥，左、右位實現執行元件的換向，中位則能滿足執行元件處于非工作狀態時系統的不同要求。

4.壓力控制閥
壓力控制閥的作用:
1、用來控制液壓系統中油液壓力;
1)溢流閥：直動式溢流閥、先導式溢流閥
2)減壓閥
2、以壓力為控制信號實現油路通斷。
3)順序閥
4)壓力繼電器
共同工作原理:利用作用于閥心上的液壓力與彈簧力相平衡的原理進行工作。
溢流閥應用實例
(1)為定量泵系統溢流穩壓和定量泵、節流閥并聯，閥口常開。
(2)變量泵系統提供過載保護
和變量泵組合，正常工作時閥口關閉，過載時打開，起安全保護作用,故又稱安全閥。
(3)實現遠程調壓  p遠程< p主調
(4)系統卸荷和多級調壓 和二位二通閥組合(先導式)
(5)形成背壓
減壓閥用于降低并穩定系統中某一支路的油液壓力，常用于夾緊、控制等油路中。
順序閥是一種利用壓力控制閥口通斷的壓力閥，因用于控制多個執行元件的動作順序而得名。按控制油來源不同分內控和外控，按彈簧腔泄漏油引出方式不同分內泄和外泄。
壓力繼電器功用:根據系統壓力變化,自動接通或斷開電路,實現程序控制或安全保護。
工作原理: pk> pT時，柱塞上升,發出信號pk< pT時，柱塞下降,斷開信號。

5.流量控制閥
功用:通過改變閥口過流面積來調節輸出流量，從而控制執行元件的運動速度。
分類:節流閥、調速閥、溫度補償調速閥、分流集流閥。
常用節流口結構有錐形、三角槽形、矩形、三角形等。由節流方程知，當壓力差.定時，改變開口面積即改變液阻就可改變流量。
節流閥實質相當于-一個可變節流口，借助控制機構使閥芯相對于閥體孔運動改變閥口的過流面積。
結構原理
主要零件有閥芯、閥體和螺母。閥體上右邊是進油口，左邊是出油口。閥芯一端開有三角尖槽，另-端加工有螺紋，旋轉閥芯即可軸向移動改變閥口過流面積。為平衡液壓徑向力，三角槽須對稱布置。
調速閥定差減壓閥與節流閥串聯而成，用來調節通過的流量自動補
償負載變化的影響。
插裝閥
上世紀70年代初發展起來的一種新元件，是古老錐閥的新應用。配以蓋板、先導閥組成的-種多功能的復合閥。因每個插裝閥基本組件有且只有兩個油口，故被稱為二通插裝閥。
特點:
閥芯為錐閥，密封性能好，且動作靈敏;
通流能力大，抗污染;
一閥多用，易組成各式系統，結構緊湊。
特別對大流量及非礦物油介質的場合，優點更為突出。
插裝閥基本組件由閥芯、閥套、彈簀和密封圈組成。根據用途不同分為方向閥組件、壓力閥組件和流量閥組件。
插裝閥的應用
單向閥
將方向閥組件的控制口通過閥塊和蓋板上的通道與油口A或B直接溝通，可組成單向閥。
二通閥
由一個二位三通電磁滑閥控制方向閥組件控制腔的通油方式，可組成二位二通閥。
三通閥
由兩個方向閥組件并聯而成，對外形成-一個壓力油口、-一個工作油口和一一個回油口。三通插裝閥的工作狀態數取決于先導換向閥的工作位置數。
四通閥由兩個三通閥并聯而成。
疊加閥以板式閥為基礎，每個疊加閥不僅起到單個閥的功能，而且還溝通閥與閥的流道。換向閥安裝在*上方，對外連接油口開在*下邊的底板上，其他的閥通過螺栓連接在換向閥和底板之間。
由疊加閥組成的系統結構緊湊，配置靈活，設計制造周期短。