力士樂壓力繼電器HED8OA-2X/200K14 R901102708，德國REXROTH壓力傳感器，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，產品實拍，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！

液壓-電氣壓力開關：
特點：
→用于底板安裝
→用于 G1/4" 管道安裝
→用于法蘭連接，符合 ISO 16873 標準
→作為垂直疊加元件，與閥板相連接，符合 ISO 4401 標準
→5 個壓力等級
→4 種調整類型：
→帶/不帶保護帽的調節桿
→帶刻度的調節桿，帶/不帶保護帽
→帶刻度旋鈕
→帶刻度可鎖定旋鈕
→電氣連接
– 帶有 A 設計的閥連接器
（大型方形連接器）
– 帶 M12 x 1 連接器
→帶常閉/常開觸點功能的微動開關
→電流零電位轉換（1 mA 至 2 A）
→壓力范圍經過 UL 認證，高達 350 bar

液壓-電氣壓力繼電器型號詳情舉例：
HED8OA-2X/200K14
1、
HED8  →柱塞式壓力開關
2、
OH    →法蘭連接
OP    →底板安裝
OA    →管道安裝
2、
2X    →組件系列 20 … 29（20 … 29：安裝和連接尺寸不變）
4、
350   →*大壓力等級 350 bar
50    →*大壓力等級 50 bar
100   →*大壓力等級 100 bar
200   →*大壓力等級 200 bar
630   →*大壓力等級 630 bar
5、電氣連接，單個連接
K14   →不帶連接插頭，連接器DIN EN 175301-803
K35   →不帶連接插頭，連接器 IEC 61076-2-101，M12 x 1
6、調整類型
無代碼  →內六角調節桿，不帶刻度，不帶保護帽
S       →內六角調節桿，不帶刻度，帶保護帽，密封
A       →帶刻度調節桿，不帶保護帽
AS      →帶刻度調節桿，帶保護帽
KS      →帶刻度可鎖定旋鈕
KW      →帶刻度旋鈕
7、密封材料
無代碼  →NBR 密封件
V       →FKM 密封件
MT      →低溫密封件（*大 315 bar） 
請務必遵守密封件與所用液壓油的兼容性！
1) 閥板用于垂直疊加，單獨訂購，請參閱附件
2) 不允許用于垂直疊加，不帶低溫密封件，未經過 UL 認證
3) 連接插頭，單獨訂購，
4) H 鑰匙，物料號 R900008158，包括在交付范圍內
5) 只能使用壓力計（刻度用于指示作用）精確設置切換壓力
 
壓力繼電器用途性能
壓力繼電器是一種將油液的壓力信號轉換成電信號的液一電轉換元件。當油液壓力達到壓力繼電器的調定壓力時，能自動接通或斷開電路，使電磁鐵、繼電器、電動機等電氣元件通電運轉或斷電停止工作，以實現對液壓系統工作程序的控制、安全保護或元件動作的聯鎖等。任何壓力繼電器都是由壓力一位移轉換裝置和微動開關兩部分組成的，按壓力一位移轉換裝置的結構劃分，有柱塞式、彈簧管式、膜片式和波紋管式四類

壓力繼電器是利用液體的壓力來啟閉電氣觸點的液壓電氣轉換元件。當系統壓力達到壓力繼電器的調定值時，發出電信號，使電氣元件（如電磁鐵、電機、時間繼電器、電磁離合器等）動作，使油路卸壓、換向，執行元件實現順序動作，或關閉電動機使系統停止工作，起安全保護作用等。

壓力繼電器有柱塞式、膜片式、彈簧管式和波紋管式四種結構形式。下面對柱塞式壓力繼電器的工作原理作一介紹：
當從繼電器下端進油口3進入的液體壓力達到調定壓力值時，推動柱塞2上移，此位移通過杠桿放大后推動微動開關4動作。改變彈簧1的壓縮量，可以調節繼電器的動作壓力。
應用場合：用于安全保護、控制執行元件的順序動作、用于泵的啟閉、用于泵的卸荷。
注意： 壓力繼電器必須放在壓力有明顯變化的地方才能輸出電信號。若將壓力繼電器放在回油路上，由于回油路直接接回油箱，壓力也沒有變化，所以壓力繼電器也不會工作。
選用標準
根據所測對象的壓力來選用,比如所測壓力范圍在8KG以內,那么就要選用額定10KG的壓力繼電器,還有要符合電路中的額定電壓,接口管徑的大小
3使用方法
首先用于安全保護時，將壓力繼電器設置在夾緊液壓缸的一端，液壓泵啟動后，首先將工件夾緊，此時夾緊液壓缸的右腔壓力升高，當升高到壓力繼電器的調定值時，壓力繼電器動作，發出電信號使2YA通電，于是切削液壓缸進刀切削。在加工期間，壓力繼電器微動開關的常開觸點始終閉合。若工件沒有夾緊，壓力繼電器2斷開，于是2YA斷電，切削液壓缸立即停止進刀，從而避免工件未夾緊被切削而出事故。 
其實用于控制執行元件的順序動作時，液壓泵啟動后，首先2YA通電，液壓缸左腔進油，推動活塞方向右移。當碰到限位器(或死擋鐵)后，系統壓力升高，壓力繼電器發出電信號，使1YA通電，高壓油進入液壓缸的左腔，推動活塞右移。這時若3YA也通電，液壓缸的活塞快速右移;若3YA斷電，則液壓缸的活塞慢速右移，其慢速運動速度由節流閥調節。
再次用于液壓泵卸荷時，壓力繼電器不是控制液壓泵停止轉動，而是控制二位二通電磁閥，將液壓泵5輸出的壓力油流回油箱，使其卸荷。
后用于液壓泵的啟閉時，有兩個液壓泵，高壓小流量泵，低壓大流量泵。當活塞快速下降時，兩泵同時輸出壓力油。當液壓缸活塞桿抵住工件開始加壓時，壓力繼電器在壓力油作用下發出動作，觸動微動開關，將常閉觸點斷開，使液壓泵停轉。在加工過程中減慢液壓缸的速度，同時減少動力消耗。
力士樂壓力繼電器HED8OA-2X/200K14 R901102708
力士樂REXROTH柱塞式壓力繼電器電液控制
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R901106453 HED8OP-2X/350K14
R901107326 HED8OP-2X/350K14A
R901091138 HED8OP-2X/350K14AS
R901108531 HED8OP-2X/350K14ASV
R901126082 HED8OP-2X/350K14AV
R901107914 HED8OP-2X/350K14KS
R901107129 HED8OP-2X/350K14KW
R901122124 HED8OP-2X/350K14KWV
R901102365 HED8OP-2X/350K14S
R901107913 HED8OP-2X/350K14SV
R901107330 HED8OP-2X/350K14V
R901127494 HED8OP-2X/350K35S
R901434285 HED8OP-2X/350P120K14KS
R901108252 HED8OP-2X/350P140K14S
R901456336 HED8OP-2X/350P280K14S
R901107083 HED8OP-2X/50K14
R901107999 HED8OP-2X/50K14A
R901107396 HED8OP-2X/50K14AS
R901123736 HED8OP-2X/50K14AV
R901108012 HED8OP-2X/50K14KS
R901108249 HED8OP-2X/50K14KW
R901106504 HED8OP-2X/50K14S
R901140517 HED8OP-2X/50K14SV
R901108001 HED8OP-2X/50K14V
R901131275 HED8OP-2X/50K35
R901336910 HED8OP-2X/50K35S
R901159161 HED8OP-2X/50K35V
R901245432 HED8OP-2X/50U025K14AV
R901108147 HED8OP-2X/630K14
R901210429 HED8OP-2X/630K14A
R901280745 HED8OP-2X/630K14AS
R901171255 HED8OP-2X/630K14ASV
R901124650 HED8OP-2X/630K14KS
R901315271 HED8OP-2X/630K14KW
R901106449 HED8OP-2X/630K14S
R901108529 HED8OP-2X/630K14V
R901437158 HED8OP-2X/630K35
R901251521 HED8OP-2X=50K14AS
R987437823 HED8OH-2X/100K14SSETTO80BARFALLING
R987411811 HED8OP2X/350K14SSETTO280BAR
R971012678 HED8OA-2X/350K14S(12.3MPA)
R971012679 HED8OA-2X/350K14S(17.2MPA)
R971012681 HED8OA-2X/350K14S(21.6MPA)
R987136869 HED8OA2X/50K14STARATOA5BAR
R901102706 HED8OA-20/100K14
R901106257 HED8OA-20/100K14/12
R901106259 HED8OA-20/100K14A
R901135255 HED8OA-20/100K14A/12
R901106262 HED8OA-20/100K14AS
R901111210 HED8OA-20/100K14AS/12
R901449421 HED8OA-20/100K14ASMT
R901106263 HED8OA-20/100K14ASV
R901141703 HED8OA-20/100K14ASV/12
R901108526 HED8OA-20/100K14AV
R901095551 HED8OA-20/100K14KS
R901145180 HED8OA-20/100K14KSV
R901094159 HED8OA-20/100K14KW
R901316371 HED8OA-20/100K14KW/12
R901153040 HED8OA-20/100K14KWV
R901102711 HED8OA-20/100K14S
R987390062 HED8OA-20/100K14S-ADJUSTEDFORFLS
R901111201 HED8OA-20/100K14S/12
R901111200 HED8OA-20/100K14SV
R901107367 HED8OA-20/100K14V
R901126668 HED8OA-20/100K14V/12
R901395456 HED8OA-20/100K35A
R901126696 HED8OA-20/100K35KS
R901127461 HED8OA-20/100K35S
R901238187 HED8OA-20/100P030K14AS
R901123283 HED8OA-20/100P040K14S
R901135061 HED8OA-20/100P070K14S
R901437873 HED8OA-20/100P070K35S
R901312179 HED8OA-20/100P100K14AS
R901102708 HED8OA-20/200K14
R901106512 HED8OA-20/200K14/12
R901107094 HED8OA-20/200K14A
R901111198 HED8OA-20/200K14A/12
R901106452 HED8OA-20/200K14AS
R901108523 HED8OA-20/200K14AS/12
R901108522 HED8OA-20/200K14ASV
R901141051 HED8OA-20/200K14AV
R901107126 HED8OA-20/200K14KS
R901111197 HED8OA-20/200K14KSV
R901106448 HED8OA-20/200K14KW
R901150699 HED8OA-20/200K14KW/12
R901108245 HED8OA-20/200K14KWV
R901102727 HED8OA-20/200K14S
R976717118 HED8OA-20/200K14SSPEZ.MEYCO180BAR
R901202306 HED8OA-20/200K14S/12
R901107805 HED8OA-20/200K14SV
R901110456 HED8OA-20/200K14V
R901211753 HED8OA-20/200K35A
R901293054 HED8OA-20/200K35KS
R901171100 HED8OA-20/200K35S
R901232897 HED8OA-20/200P120K14AS
R901213491 HED8OA-20/200P130K14S
R901338304 HED8OA-20/200P180K14AS
R901214160 HED8OA-20/200P180K14S
R901306495 HED8OA-20/200U100K14S
R901107923 HED8OA-20/200U120K14S
R901107393 HED8OA-20/200U165K14S
R901108521 HED8OA-20/200U170K14S
R901107318 HED8OA-20/200U180K14S
R901171875 HED8OA-20/350F080K14S
R901131246 HED8OA-20/350F105K14S
R901102710 HED8OA-20/350K14
R901107091 HED8OA-20/350K14/12
R901106455 HED8OA-20/350K14A
R901108518 HED8OA-20/350K14A/12
R901102722 HED8OA-20/350K14AS
R901111192 HED8OA-20/350K14AS/12
R901108517 HED8OA-20/350K14ASV
R901110453 HED8OA-20/350K14ASV/12
R901110452 HED8OA-20/350K14AV
R901107087 HED8OA-20/350K14KS
R901134010 HED8OA-20/350K14KSV
R901102716 HED8OA-20/350K14KW
R901107332 HED8OA-20/350K14KW/12
R901110450 HED8OA-20/350K14KWV
R901102778 HED8OA-20/350K14S
R901108009 HED8OA-20/350K14S/12
R901107922 HED8OA-20/350K14SV
R901186318 HED8OA-20/350K14SV/12
R901107796 HED8OA-20/350K14V
R901110447 HED8OA-20/350K14V/12
R901125561 HED8OA-20/350K35
R987199324 HED8OA-20/350K35
R901127471 HED8OA-20/350K35A
R901127477 HED8OA-20/350K35AS
R901272251 HED8OA-20/350K35KS
R901127474 HED8OA-20/350K35S
R901181469 HED8OA-20/350P160K14S
R901371576 HED8OA-20/350P170K14S
R901371577 HED8OA-20/350P200K14S
R901245027 HED8OA-20/350P250K14S
R901217016 HED8OA-20/350P270K14S
R901376877 HED8OA-20/350P300K14
R901171883 HED8OA-20/350U110K14S
R901168129 HED8OA-20/350U210K14S
R901101698 HED8OA-20/50K14
R901107793 HED8OA-20/50K14/12
R901106507 HED8OA-20/50K14A
R901110444 HED8OA-20/50K14A/12
R901106499 HED8OA-20/50K14AS
R901110443 HED8OA-20/50K14AS/12
R901110166 HED8OA-20/50K14ASV
R901110164 HED8OA-20/50K14AV
R901110163 HED8OA-20/50K14AV/12
R901102702 HED8OA-20/50K14KS
R901110160 HED8OA-20/50K14KSV
R901102754 HED8OA-20/50K14KW
R976722498 HED8OA-20/50K14KW-10BARSTEIGEND
R901108514 HED8OA-20/50K14KW/12
R901110155 HED8OA-20/50K14KWV
R901102704 HED8OA-20/50K14S
R987255554 HED8OA-20/50K14S
R901155751 HED8OA-20/50K14S/12
R901110149 HED8OA-20/50K14SV
R901110147 HED8OA-20/50K14SV/12
R901117070 HED8OA-20/50K14V
R901109543 HED8OA-20/50K14V/12
R901173249 HED8OA-20/50K35
R901349292 HED8OA-20/50K35AS
R901336212 HED8OA-20/50K35KS
R901155571 HED8OA-20/50K35S
R901312177 HED8OA-20/50P010K14AS
R901213487 HED8OA-20/50P015K14S
R901244472 HED8OA-20/50R020K14S
R901355720 HED8OA-20/50U020K14S
R901107127 HED8OA-20/630K14
R901134765 HED8OA-20/630K14/12
R901275335 HED8OA-20/630K14A
R901108512 HED8OA-20/630K14AS
R901199523 HED8OA-20/630K14ASV
R901109541 HED8OA-20/630K14KS
R901109538 HED8OA-20/630K14KW
R901119175 HED8OA-20/630K14KW/12
R901107915 HED8OA-20/630K14S
R901130967 HED8OA-20/630K14SV
R901118228 HED8OA-20/630K14V
R901188553 HED8OA-20/630K35A
R901426835 HED8OA-20/630K35S
R901364935 HED8OA-20=100K14S
R901364011 HED8OA-20=200K14S
R901448964 HED8OA-20=200K14SV
R901364934 HED8OA-20=350K14S
R901222334 HED8OA-20=50K14AS
R987140396 HED8OA20/350K14+PISTOKE
R987140316 HED8OA20/50K14+PISTOKE
R987129279 HED8OH20/100Z14STS10AQ
R987128506 HED8OH20/200K14STARATOSEC.TS10AQ
R901102360 HED8OH-20/100K14
R901107128 HED8OH-20/100K14A
R901106505 HED8OH-20/100K14AS
R901109535 HED8OH-20/100K14ASV
R901099780 HED8OH-20/100K14AV
R901106498 HED8OH-20/100K14KS
R901099788 HED8OH-20/100K14KSV
R901107122 HED8OH-20/100K14KW
R901109532 HED8OH-20/100K14KWV
R901095375 HED8OH-20/100K14S
R901108268 HED8OH-20/100K14SV
R901099775 HED8OH-20/100K14V
R901125068 HED8OH-20/100K35KS
R901315927 HED8OH-20/100K35S
R901421283 HED8OH-20/100U060K14S
R901108239 HED8OH-20/100U070K14S
R901099808 HED8OH-20/200K14
R901099809 HED8OH-20/200K14A
R901107119 HED8OH-20/200K14AS
R901109530 HED8OH-20/200K14ASV
R901099790 HED8OH-20/200K14AV
R901099811 HED8OH-20/200K14KS
R901099792 HED8OH-20/200K14KSV
R901107369 HED8OH-20/200K14KW
R901125810 HED8OH-20/200K14KWV
R901102362 HED8OH-20/200K14S
R901109074 HED8OH-20/200K14SV
R901099789 HED8OH-20/200K14V
R901148816 HED8OH-20/200K35KS
R901171767 HED8OH-20/200K35S
R901270140 HED8OH-20/200P110K14S
R901139168 HED8OH-20/200P145K14S
R901139169 HED8OH-20/200P185K14S
R901099813 HED8OH-20/200U150K14V
R901099814 HED8OH-20/200U180K14V
R901099793 HED8OH-20/200U185K14V
R901101640 HED8OH-20/350K14
R901107313 HED8OH-20/350K14A
R901108236 HED8OH-20/350K14AS
R901109071 HED8OH-20/350K14ASV
R901099816 HED8OH-20/350K14AV
R901106454 HED8OH-20/350K14KS
R901099817 HED8OH-20/350K14KSV
R901107095 HED8OH-20/350K14KW
R901109069 HED8OH-20/350K14KWV
R901102713 HED8OH-20/350K14S
R901109065 HED8OH-20/350K14SV
R901099815 HED8OH-20/350K14V
R901388617 HED8OH-20/350K35
R901417246 HED8OH-20/350K35AS
R901265207 HED8OH-20/350K35S
R901128257 HED8OH-20/50F004K14SV
R901219262 HED8OH-20/50F010K14V
R901102349 HED8OH-20/50K14
R901108007 HED8OH-20/50K14A
R901107086 HED8OH-20/50K14AS
R901109050 HED8OH-20/50K14ASV
R901099798 HED8OH-20/50K14AV
R901102356 HED8OH-20/50K14KS
R901099800 HED8OH-20/50K14KSV
R901107394 HED8OH-20/50K14KW
R901109049 HED8OH-20/50K14KWV
R901102712 HED8OH-20/50K14S
R901215098 HED8OH-20/50K14SV
R901099796 HED8OH-20/50K14V
R901156058 HED8OH-20/50K35KS
R901231720 HED8OH-20/50K35S
R901101658 HED8OH-20/630K14
R901109035 HED8OH-20/630K14AS
R901109039 HED8OH-20/630K14ASV
R901136386 HED8OH-20/630K14KS
R901307873 HED8OH-20/630K14KSV
R901336213 HED8OH-20/630K14KW
R901109029 HED8OH-20/630K14S
R901101649 HED8OH-20/630K14V
R901369355 HED8OH-20=200K14
R901342162 HED8OH-20=50K14
R901232375 HED8OH-20=50K14S
R987140394 HED8OH20/350K14+PISTOKE
R901102747 HED8OP-20/100K14
R901108229 HED8OP-20/100K14A
R901107790 HED8OP-20/100K14AS
R901162988 HED8OP-20/100K14ASV
R901321355 HED8OP-20/100K14AV
R901107997 HED8OP-20/100K14KS
R901107370 HED8OP-20/100K14KW
R901106509 HED8OP-20/100K14S
R901109028 HED8OP-20/100K14SV
R901108265 HED8OP-20/100K14V
R901437159 HED8OP-20/100K35
R901206318 HED8OP-20/100K35KW
R901127492 HED8OP-20/100K35S
R901354506 HED8OP-20/100P020K14S
R901354507 HED8OP-20/100P030K14S
R901109027 HED8OP-20/100P070K14S
R901102721 HED8OP-20/200K14
R901108023 HED8OP-20/200K14A
R901108003 HED8OP-20/200K14AS
R901109024 HED8OP-20/200K14ASV
R901137607 HED8OP-20/200K14AV
R901108258 HED8OP-20/200K14KS
R901108018 HED8OP-20/200K14KW
R901109010 HED8OP-20/200K14KWV
R901107093 HED8OP-20/200K14S
R901109004 HED8OP-20/200K14SV
R901107397 HED8OP-20/200K14V
R901336909 HED8OP-20/200K35S
R901233431 HED8OP-20/200P110K14S
R901108992 HED8OP-20/200P160K14S
R901106453 HED8OP-20/350K14
R901107326 HED8OP-20/350K14A
R901091138 HED8OP-20/350K14AS
R901108531 HED8OP-20/350K14ASV
R901126082 HED8OP-20/350K14AV
R901107914 HED8OP-20/350K14KS
R901107129 HED8OP-20/350K14KW
R901122124 HED8OP-20/350K14KWV
R901102365 HED8OP-20/350K14S
R901107913 HED8OP-20/350K14SV
R901107330 HED8OP-20/350K14V
R901127494 HED8OP-20/350K35S
R901434285 HED8OP-20/350P120K14KS
R901108252 HED8OP-20/350P140K14S
R901456336 HED8OP-20/350P280K14S
R901107083 HED8OP-20/50K14
R901107999 HED8OP-20/50K14A
R901107396 HED8OP-20/50K14AS
R901123736 HED8OP-20/50K14AV
R901108012 HED8OP-20/50K14KS
R901108249 HED8OP-20/50K14KW
R901106504 HED8OP-20/50K14S
R901140517 HED8OP-20/50K14SV
R901108001 HED8OP-20/50K14V
R901131275 HED8OP-20/50K35
R901336910 HED8OP-20/50K35S
R901159161 HED8OP-20/50K35V
R901245432 HED8OP-20/50U025K14AV
R901108147 HED8OP-20/630K14
R901210429 HED8OP-20/630K14A
R901280745 HED8OP-20/630K14AS
R901171255 HED8OP-20/630K14ASV
R901124650 HED8OP-20/630K14KS
R901315271 HED8OP-20/630K14KW
R901106449 HED8OP-20/630K14S
R901108529 HED8OP-20/630K14V
R901437158 HED8OP-20/630K35
R901251521 HED8OP-20=50K14AS
R987437823 HED8OH-20/100K14SSETTO80BARFALLING
R987411811 HED8OP20/350K14SSETTO280BAR
R971012678 HED8OA-20/350K14S(12.3MPA)
R971012679 HED8OA-20/350K14S(17.2MPA)
R971012681 HED8OA-20/350K14S(21.6MPA)
液壓系統中的壓力控制閥
在液壓系統中,壓力控制閥可以調定系統主回路或分支回路的壓力.按照功能分類,常用的壓力控制閥有溢流閥,減壓閥,順序閥和壓力繼電器等.這些壓力控制閥結構上相似,但性能有差別,在系統中的作用也不盡相同.搞清它們的區別與聯系,對于學習壓力控制回路以至液壓系統的分析廣片常重要的。
一,溢流閥
功能 溢流閥的功能是通過閥口溢流,使被控系統或回路的壓力保持穩定,實現穩壓,調壓或限壓的作用.
特點 按照結構,溢流閥有直動式和先導式兩種.對于直動式溢流閥,當壓力較高,流量較大時,要求調壓彈簧有很大的剛度,調節性能較差,而滑閥的泄漏也使高壓控制難以實現,故只能用于低壓小流量場合.先導式溢流閥的特點是用先導閥控制主閥,在溢流閥主閥溢流時,溢流閥進口壓力可維持為由先導閥彈簧所調定的定值.先導式溢流閥的另一特點是具有遠程控制口,可很方便地實現系統卸荷或運程調壓。
溢流閥的泄漏油或流經先導閥的油液在返回油祚時有內泄和外泄兩種方式.內泄時泄漏油流經的彈簧腔或先導閥彈簧座通過閥體內的連接通道與出油口和通,而外泄是泄露油或流經先導閥的油液被直接單獨引回油箱。
應用 溢流閥的主要用途:(1)在定量泵的出口并聯溢流閥可調節泵的出口壓力;(2)在變量泵的出口并聯溢流閥可對系統起到過載保護作用;(3)在回油路上摟入直動式溢流閥可使執行元件運動平穩;(4)利用先導式溢流閥的遠程控制口可實現系統卸荷或遠程調壓.總之,在系統中溢流閥可作為溢流閥,安全閥,背壓閥使用,可以調節系統的壓力或使系統卸荷.
二,減壓閥
功能 減壓閥的功能在于使流經減壓閥的油液壓力降低,并使與減壓閥出口連接的回路壓力保持穩定.即減壓閥的出口壓力可維持恒定,不受進口壓力及通過流量的影響。
特點 按照結構減壓閥也有直動式和先導式兩種,分別用于不同場合.
堿壓限的閥心處在原始位置上時,它的閥口是打開的,閥的進,出口溝通.閥心由出口處的壓力控制,出口壓力未達到調定壓力時閥口全開,閥心不動.當出口壓力達到調定壓力時,閥心上移,閥口關小,在調定壓力下達到平衡.當減壓閥的出口處不輸出油液時,它的出口壓力仍能夠基本保持恒定,此時有少量油液經先導閥流回油箱。
減壓閥與溢流閥的主要區別為:(1)減壓閥能保持出口處的壓力基本不變,而溢流閥則保持進口處的壓力基本不變;(2)在不工作時,減壓閥的進出油口互通,溢流閥的進出油口不通;(3)減壓閥要求外泄,其先導閥的彈簧腔需通過泄油口單獨外接油箱,而溢流閥允許內泄,其先導閥彈簧腔通過閥體內的連接通道與出油口相通,不必單獨外接油箱。
應用 減壓閥主要用于降低系統某一支路的油液壓力,在同一系統中得到兩個或多個不同壓力的回路.常用于夾緊支路,潤滑支路或電液動換向閥的控制回路.需要注意的是減壓閥具有壓力損失,當分支油路比主油路的壓力低很多,且流量較大時,可考慮采用高,低壓泵分別供油.
三,順序閥
功能 順序閥的功能在于利用液壓系統中的壓力變化,控制油路通斷來控制多個執行元件的順序動作
特點 按照結構,順序閥也有直動式和先導式兩種.直動式順序閥結構簡單,動作靈敏但調定壓力較低,較高壓力時宜采用先導式順序閥.根據控制壓力來源的不同,順序閥有內控式和外控式之分,請注意兩者圖形符號的區別.內控式順序閥在進油路壓力達到設定壓力之前,閥口一直是關閉的,達到設定壓力后閥口打開,使壓力油進入油路;外控式順序閥閥口的開閉與油路進口壓力無關,僅取決于控制油路壓力的大小。
順序閥與溢流閥的主要區別為:(1)當順序閥的出口與負載油路相通時,泄漏油和先導控制油必須外泄,而溢流閥的出口與回油相通,泄漏油和先導控制油可外泄也可內泄;(2)溢流閥的進口壓力是限定的,即閥的調定壓力,順序閥的進口壓力由負載決定,順序閥開啟后可隨負載增加市進一步升高.
應用 順序閥的主要用途為:(1)控制多個執行元件的順序動作;(2)內控式順序閥可作背壓閥使用;(3)與單向閥并聯組成平衡閥,鎖定執行元件;(4)外控順序閥可用于雙泵供油系統的卸荷.
四,壓力繼電器
壓力繼電器是利用液體壓力信號控制電氣觸點通斷的液壓電氣轉換元件,當油液的壓力達到其設定壓力時,壓力繼電器發出電信號,以控制電氣元件動作,實現執行元件的順序動作或系統的安全保護和動作互鎖。