力士樂壓力切斷閥DA6VP2A50/200FSM R901224233，德國REXROTH壓力切斷閥，購買進口液壓、氣動、自動化控制工業(yè)配件，認準“上海韋米機電設(shè)備有限公司”，7年老店，產(chǎn)品實拍，保證產(chǎn)品原廠原裝，價格優(yōu)惠，售后無憂，歡迎新老客戶咨詢采購！
 

液壓傳動技術(shù)已經(jīng)廣泛應(yīng)用于很多工程技術(shù)領(lǐng)域,由于液壓系統(tǒng)所服務(wù)的主機的工作循環(huán)、動作特點等各不相同,相應(yīng)的各液壓系統(tǒng)的組成、作用和特點也不盡相同。以下通過對幾個典型液壓系統(tǒng)的分析,進一步熟悉各液壓元件在系統(tǒng)中的作用和各種基本回路的組成,并掌握分析液壓系統(tǒng)的方法和步驟。
閱讀一個較為復(fù)雜的液壓系統(tǒng)圖,大致可按以下步驟進行:
(1)了解設(shè)備的工藝對液壓系統(tǒng)的動作要求;
(2)初步游覽整個系統(tǒng), 了解系統(tǒng)中包含有哪些元件,并以各個執(zhí)行元件為中心,將系統(tǒng)分解為若干子系統(tǒng)。
(3)對每一子系統(tǒng)進行分析,搞清楚其中含有哪些基本回路,然后根據(jù)執(zhí)行元件的動作要求,參照動作循環(huán)表讀懂這一子系統(tǒng)。
(4)根據(jù)液壓設(shè)備中各執(zhí)行元件間互鎖、同步、防干涉等要求,分析各子系統(tǒng)之間的聯(lián)系。
(5)在全面讀懂系統(tǒng)的基礎(chǔ)上,歸納總結(jié)整個系統(tǒng)有哪些特點,以加深對系統(tǒng)的理解。

一,組合機床液壓系統(tǒng)
組合機床液壓系統(tǒng)主要由通用滑臺和輔助部分(如定位、夾緊)組成。動力滑臺本身不帶傳動裝置,可根據(jù)加工需要安裝不同用途的主軸箱,以完成鉆、擴、鉸、鏜、刮端面、銑削及攻絲等工序。
有液壓夾緊的他驅(qū)式動力滑臺的液壓系統(tǒng)原理圖，這個系統(tǒng)采用限壓式變量泵供油，并配有二位二通電磁閥卸荷，變量泵與進油路的調(diào)速閥組成容積節(jié)流調(diào)速回路，用電液換向閥控制液壓系統(tǒng)的主油路換向，用行程閥實現(xiàn)快和工進的速度換接。

二,液壓系統(tǒng)的特點
液壓系統(tǒng)采用限壓式變量泵和調(diào)速閥組成容積節(jié)流調(diào)速系統(tǒng),把調(diào)速閥裝在進油路上,而在回油路上加背壓閥。這樣就獲得了較好的低速穩(wěn)定性、較大的調(diào)速范圍和較高的效率。而且當滑臺需死擋鐵停留時,用壓力繼電器發(fā)出信號實現(xiàn)快退比較方便。
采用限壓式變量泵并在快進時采用差動連接, 不僅使快進速度和快退速度相同差動缸),而且比不采用差動連接的流量可誠小一倍,其能量得到合理利用,系統(tǒng)效率進一步得到提高。
采用電液換向閥使換向時間可調(diào),改善和提高了換向性能。采用行程閥和液控順序閥來實現(xiàn)快進與工進的轉(zhuǎn)換,比采用電磁閥的電路簡化,而且使速度轉(zhuǎn)換動作可靠,轉(zhuǎn)換精度也較高。此外,用兩個調(diào)速閥串聯(lián)來實現(xiàn)兩次工進, 使轉(zhuǎn)換速度平穩(wěn)而無沖擊。
夾緊油路中串接誠壓閥,不僅可使其壓力低于主油路壓力,而且可根據(jù)工件夾緊力的需要來調(diào)節(jié)并穩(wěn)定其壓力;當主系統(tǒng)快速運動時,即使主油路壓力低于減壓閥所調(diào)壓力,因為有單向閥的存在,夾緊系統(tǒng)也能維持其壓力(保壓)。夾緊油路中采用二位四通閥,它的常態(tài)位置是夾緊工件,這樣即使在加工過程中臨時停電,也不至于使工件松開,保證了操作安全可靠。
力士樂壓力切斷閥DA6VP2A50/200FSM R901224233
力士樂REXROTH高壓截止閥
力士樂REXROTH高壓截止閥，先導(dǎo)式
力士樂REXROTH壓力切斷閥，先導(dǎo)操作，機械操作KAV
R901220879 KAV2C2AA/AM
R901058924 KAV2C2AA/AV
R901220878 KAV2F2AA/AM
R901058926 KAV2F2AA/AV
R901354128 KAV2K2AA/A-130-110V
R901353452 KAV2K2AA/A-160-140V
R901220877 KAV2K2AA/AM
R901058929 KAV2K2AA/AV
R901231664 KAV2K2AA/AV-028
R901220869 KAV2R2AA/AM
R901058934 KAV2R2AA/AV
R901231663 KAV2R2AA/AV-028
力士樂REXROTH先導(dǎo)式壓力切斷閥DA 6 V
R901224217 DA6VA2A5X/100FSM
R987400141 DA6VA2A5X/100FSMSO26-746
R901184163 DA6VA2A5X/100FSV
R901224218 DA6VA2A5X/200FSM
R901184165 DA6VA2A5X/200FSV
R901224223 DA6VA2A5X/350FSM
R901184169 DA6VA2A5X/350FSV
R901224225 DA6VA2A5X/50FSM
R901184162 DA6VA2A5X/50FSV
R901224226 DA6VA2B5X/100FSM
R901184669 DA6VA2B5X/100FSV
R901224246 DA6VA2B5X/200FSM
R901184173 DA6VA2B5X/200FSV
R901224228 DA6VA2B5X/350FSM
R901184176 DA6VA2B5X/350FSV
R901224230 DA6VA2B5X/50FSM
R901184170 DA6VA2B5X/50FSV
R901224232 DA6VP2A5X/100FSM
R901184158 DA6VP2A5X/100FSV
R901224233 DA6VP2A5X/200FSM
R901224233 DA6VP2A50/200FSM
R901311545 DA6VP2A5X/200FSM/60
R901184160 DA6VP2A5X/200FSV
R901368965 DA6VP2A5X/200FSV/60
R901224247 DA6VP2A5X/350FSM
R901184161 DA6VP2A5X/350FSV
R901224234 DA6VP2A5X/50FSM
R901184151 DA6VP2A5X/50FSV
R901224235 DA6VP2B5X/100FSM
R901184179 DA6VP2B5X/100FSV
R901224238 DA6VP2B5X/200FSM
R901184183 DA6VP2B5X/200FSV
R901224242 DA6VP2B5X/350FSM
R901184186 DA6VP2B5X/350FSV
R901224244 DA6VP2B5X/50FSM
R901184177 DA6VP2B5X/50FSV
力士樂REXROTH先導(dǎo)式壓力切斷閥DA
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R900926229 DA10-1-5X/100-10
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R900546354 DA10-2-5X/200-17YSO65
R900740745 DA10-2-5X/200-17Y/12
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R900533467 DA10-2-5X/315-00SO70
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R901106508 DA10-7-5X/200-10
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R900559994 DA10-7-5X/315-17
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R900563506 DAC1-5X/50-17Y
R900523681 DAC2-5X/100-10
R900903679 DAC2-5X/100-10Y
R900502462 DAC2-5X/100-17
R900529919 DAC2-5X/100-17Y
R900547885 DAC2-5X/200-00SO72
R900508238 DAC2-5X/200-00YSO20
R900503635 DAC2-5X/200-10
R900958154 DAC2-5X/200-10SO46
R900520225 DAC2-5X/200-10Y
R900763599 DAC2-5X/200-10Y/12
R900597205 DAC2-5X/200-17
R900976227 DAC2-5X/200-17/12
R900502644 DAC2-5X/200-17V
R900505759 DAC2-5X/200-17Y
R900599082 DAC2-5X/315-10
R900520302 DAC2-5X/315-10V
R900597953 DAC2-5X/315-17
R978878641 DAC2-5X/315-17/12
R900520301 DAC2-5X/315-17V
R900598099 DAC2-5X/315-17Y
R900903681 DAC2-5X/50-10Y
R901029713 DAC2-5X/50-17/12
R900903680 DAC2-5X/50-17Y
R900599192 DAC3-5X/200-00SO29
R900944277 DAC3-5X/200-10
R900598616 DAC3-5X/200-17
R900901162 DAC3-5X/200-17/12
R900514423 DAC3-5X/315-17
R900509286 DAC30-1-5X/200-10
R901093146 DAC30-1-5X/200-10Y
R900597879 DAC30-1-5X/200-17
R900918629 DAC30-1-5X/200-17Y
R900596611 DAC30-1-5X/315-17
R900509557 DAC30-1-5X/315-17Y
R900597316 DAC30-2-5X/100-10
R900573413 DAC30-2-5X/100-10Y
R900519936 DAC30-2-5X/100-10YV
R900507744 DAC30-2-5X/100-17
R900514940 DAC30-2-5X/100-17V
R900515058 DAC30-2-5X/100-17Y
R900537730 DAC30-2-5X/200-10
R900943756 DAC30-2-5X/200-10V
R900597120 DAC30-2-5X/200-10Y
R900558848 DAC30-2-5X/200-10Y=LB
R900597541 DAC30-2-5X/200-17
R900505541 DAC30-2-5X/200-17Y
R900546348 DAC30-2-5X/200-17YV
R900513800 DAC30-2-5X/315-10
R900969706 DAC30-2-5X/315-10V
R900598452 DAC30-2-5X/315-17
R900597611 DAC30-2-5X/315-17Y
R901007242 DAC30-2-5X/50-10
R900763492 DAC30-2-5X/50-10Y
R900247867 DAC30-3-5X/100-17
R900557717 DAC30-3-5X/200-17V
R900958955 DAC30-3-5X/315-17
R900515856 DAC30-3-5X/50-17YV
R978868397 DAC-2-5X/100-17/12
R987156169 DAC-2-5X/315-17SO26-567
R987109281 DAC-2-5X/50-17/12
R901264745 DAC1-5X/100-10
R900597813 DAC1-5X/100-17Y
力士樂REXROTH先導(dǎo)式壓力切斷閥DAW
R900518380 DAW10.1-5X/200-17
R901162214 DAW10A1-5X/200-10-6EG24N9K4
R901225304 DAW10A1-5X/315-10-6EG24N9K4
R900742101 DAW10A1-5X/315-10-6EW110N9K4
R900619390 DAW10A1-5X/315-17-6EG24N9K4
R900973418 DAW10A1-5X/315-17-6EW110N9K4
R900618576 DAW10A1-5X/315-17-6EW230N9K4
R901213260 DAW10A1-5X/50-10-6EG24N9K4
R901124227 DAW10A2-5X/100-10-6EG24N9K4
R900968865 DAW10A2-5X/100-10-6EW230N9K4
R900527923 DAW10A2-5X/100-10Y6AG24NZ4
R900965146 DAW10A2-5X/100-10Y6EG24N9K4
R900244242 DAW10A2-5X/100-17-6EG24N9K4
R901087839 DAW10A2-5X/100-17-6EW230N9K4
R901410491 DAW10A2-5X/200-10-6EG110N9K4V
R900924944 DAW10A2-5X/200-10-6EG24N9K4
R900538279 DAW10A2-5X/200-10Y6AG24NZ4SO80
R900528767 DAW10A2-5X/200-17-6AG24NZ4
R901007252 DAW10A2-5X/200-17-6EW230N9K4
R900573586 DAW10A2-5X/200-17Y6AG24NZ4
R900504562 DAW10A2-5X/200-17Y6AW110-50NZ4
R900900606 DAW10A2-5X/200-17Y6AW220-50N9Z5LSO80
R901081316 DAW10A2-5X/200-17Y6EG24N9K4
R900976221 DAW10A2-5X/200-17Y6EW110N9K4
R900538290 DAW10A2-5X/315-10-6AG24NZ4
R900552391 DAW10A2-5X/315-10-6AW220-50NZ4
R900975412 DAW10A2-5X/315-10-6EG24N9K4
R900520975 DAW10A2-5X/315-10Y6AG24NZ5L
R900945643 DAW10A2-5X/315-10Y6EG24N9K4
R900507150 DAW10A2-5X/315-17-6AG24NZ4
R900773361 DAW10A2-5X/315-17-6EG24N9K4
R900946241 DAW10A2-5X/315-17Y6EG24N9K4
R900560523 DAW10A2-5X/50-10-6AW220-50NZ4
R901344215 DAW10A2-5X/50-17-6EG24N9K4
R901000626 DAW10A2-5X/50-17YEG24N9K4
R900501180 DAW10A3-5X/100-17-6AW220-50NZ4
R900501577 DAW10A3-5X/200-17-6AW220-50NZ4
R901211875 DAW10A7-5X/200-10-6EG24N9K4
R900950155 DAW10A7-5X/315-17-6EG24N9K4
R900978624 DAW10A7-5X/315-17-6EW230N9K4
R901083481 DAW10A7-5X/50-17Y6EG24N9K4
R900908685 DAW10B1-5X/100-10-6AG24NZ5L
R900908685 DAW10B1-5X/100-10-6AG24NZ5L
R900524786 DAW10B1-5X/100-10-6AW120-60NZ4
R900710722 DAW10B1-5X/100-10-6EG24N9K4
R900618410 DAW10B1-5X/100-10Y6EG24N9K4
R901240505 DAW10B1-5X/100-10Y6EG24N9K4V
R900955193 DAW10B1-5X/100-17-6EG24K4
R900784251 DAW10B1-5X/100-17-6EG24N9K4
R900734486 DAW10B1-5X/200-10-6EG24N9K4
R900502248 DAW10B1-5X/200-17-6AG24NZ4
R900562507 DAW10B1-5X/200-17-6AW220-60NZ4
R901125663 DAW10B1-5X/200-17-6EG125N9K4
R900971470 DAW10B1-5X/200-17-6EG24N9K4
R900958580 DAW10B1-5X/315-10-6EG24N9K4
R900618411 DAW10B1-5X/315-10Y6EG24N9K4
R900962742 DAW10B1-5X/315-17-6EG24K4
R900732512 DAW10B1-5X/50-10-6EG24N9K4
R900555398 DAW10B2-5X/100-10-6AG24NK4
R900534942 DAW10B2-5X/100-10-6AW220RNZ5L
R900979168 DAW10B2-5X/100-10-6EG24N9K4
R900967143 DAW10B2-5X/100-10-6EW230N9K4
R900515346 DAW10B2-5X/100-10Y6AG24NZ4
R900525755 DAW10B2-5X/100-10Y6AW220RNZ5L
R900700265 DAW10B2-5X/100-10Y6EG24N9K4
R901336831 DAW10B2-5X/100-10Y6EW230N9K4
R900518576 DAW10B2-5X/100-17-6AG24NK4
R900560446 DAW10B2-5X/100-17-6AG24NK4SO65
R900501264 DAW10B2-5X/100-17-6AG24NZ4
R900518498 DAW10B2-5X/100-17-6AG24NZ5L
R900597568 DAW10B2-5X/100-17-6AW120-60NZ5L
R900507520 DAW10B2-5X/100-17-6AW220-50NZ4
R900768206 DAW10B2-5X/100-17-6EG24N9K33L=AN
R900956752 DAW10B2-5X/100-17-6EG24N9K4
R900509028 DAW10B2-5X/100-17Y6AG24NZ4
R901216243 DAW10B2-5X/100-FS6EG24N9K4
R900503011 DAW10B2-5X/200-10-6AG24NZ4
R900506405 DAW10B2-5X/200-10-6AG24NZ5L
R900918091 DAW10B2-5X/200-10-6EG24N9K4
R901005268 DAW10B2-5X/200-10-6EW230N9K4
R900562590 DAW10B2-5X/200-10Y6AG24NZ4
R900560432 DAW10B2-5X/200-10Y6AG24NZ4SO80
R900517239 DAW10B2-5X/200-10Y6AG24NZ5L
R900500449 DAW10B2-5X/200-10Y6AG24NZ5L1
R901139531 DAW10B2-5X/200-10Y6EG24N9K4
R900595779 DAW10B2-5X/200-17-6AG24NZ4
R900596865 DAW10B2-5X/200-17-6AG24NZ5L
R900596922 DAW10B2-5X/200-17-6AG24NZ5L2
R900514569 DAW10B2-5X/200-17-6AG24NZ5L3
R900504545 DAW10B2-5X/200-17-6AW220-50NZ4
R900958578 DAW10B2-5X/200-17-6EG24N9K4
R901028455 DAW10B2-5X/200-17-6EW110N9K4
R900618414 DAW10B2-5X/200-17-6EW230N9K4
R900915903 DAW10B2-5X/200-17-6EW230N9Z4
R900513399 DAW10B2-5X/200-17Y6AG24NZ4
R900550035 DAW10B2-5X/200-17Y6AG24NZ4SO65
R900923156 DAW10B2-5X/200-17Y6EG24N9K4
R901216252 DAW10B2-5X/200-FS6EG24N9K4
R901349501 DAW10B2-5X/200-FSY6EW110N9K4
R900909827 DAW10B2-5X/315-00-6AG24NZ4SO63
R900506406 DAW10B2-5X/315-10-6AG24NZ5L
R900528206 DAW10B2-5X/315-10-6AW220-50NZ4
R900955904 DAW10B2-5X/315-10-6EG24N9K4
R901412526 DAW10B2-5X/315-10-6EW230N9K4
R900906291 DAW10B2-5X/315-10Y6AG24NK4
R900529506 DAW10B2-5X/315-10Y6AG24NK4SO65
R900566579 DAW10B2-5X/315-10Y6AG24NZ4
R900517960 DAW10B2-5X/315-10Y6AG24NZ5L
R900573343 DAW10B2-5X/315-10Y6AG24NZ5LSO65
R900904268 DAW10B2-5X/315-10Y6AW110-60NK4SO65
R900528519 DAW10B2-5X/315-10Y6AW220-50NZ4
R900924463 DAW10B2-5X/315-10Y6EG24N9K4
R900962885 DAW10B2-5X/315-10Y6EW110N9K4
R900910518 DAW10B2-5X/315-10Y6EW110N9Z4
R900978992 DAW10B2-5X/315-10Y6EW230N9K4
R900599687 DAW10B2-5X/315-17-6AG24NZ4
R900513005 DAW10B2-5X/315-17-6AG24NZ5L
R900504232 DAW10B2-5X/315-17-6AW220-50NZ4
R900596757 DAW10B2-5X/315-17-6AW220-60NZ4
R900596757 DAW10B2-5X/315-17-6AW220-60NZ4
R900937976 DAW10B2-5X/315-17-6EG24N9K4
R900951867 DAW10B2-5X/315-17-6EG24N9K4V
R900945786 DAW10B2-5X/315-17-6EW230N9K4
R900509510 DAW10B2-5X/315-17Y6AG24NZ4
R900598868 DAW10B2-5X/315-17Y6AG24NZ5L
R900523241 DAW10B2-5X/315-17Y6AW220RNZ5
R900938568 DAW10B2-5X/315-17Y6EG24N9K4
R900963636 DAW10B2-5X/315-17Y6EG24N9K4=CSA
R901432461 DAW10B2-5X/315-17Y6EW230N9K4
R900915905 DAW10B2-5X/315-17Y6EW230N9Z4
R901216251 DAW10B2-5X/315-FS6EG24N9K4
R900246996 DAW10B2-5X/50-17-6EG24N9K4
R900949918 DAW10B2-5X/50-17Y6EG24N9K4
R901216244 DAW10B2-5X/50-FS6EG24N9K4
R900964809 DAW10B3-5X/100-17-6EG24N9K4
R900922963 DAW10B3-5X/100-17Y6EG24N9K4
R900524392 DAW10B3-5X/200-10-6AG24NZ4
R900512537 DAW10B3-5X/200-10-6AG24NZ5L
R900713480 DAW10B3-5X/200-10-6EG24N9K4
R900570044 DAW10B3-5X/200-17-6AG24NZ4
R900935782 DAW10B3-5X/200-17-6EG24N9K4
R900712019 DAW10B3-5X/315-10-6EG24N9K4
R900718444 DAW10B3-5X/315-17-6EG24N9 DAL
R900969895 DAW10B3-5X/315-17-6EG24N9K4
R900501041 DAW10B3-5X/315-17Y6AG24Z5L
R901187251 DAW10B3-5X/315-17Y6EG24K4
R900536964 DAW10B3-5X/350-10-6SLG24NZ4SO26
R900725801 DAW10B7-5X/50-10-6EG24N9K4
R900968804 DAW10A2-5X/200-10-6EW230N9K4
R900501915 DAW20A1-5X/100-17-6AG24NZ4
R901081870 DAW20A1-5X/100-17-6EG24N9K4
R900571897 DAW20A1-5X/100-17Y6AW220-50NZ4
R900749799 DAW20A1-5X/200-17-6EG24N9K4
R901318370 DAW20A1-5X/200-17-6EW230N9K4
R900958749 DAW20A1-5X/200-17Y6EW230N9K4
R900900924 DAW20A1-5X/315-10Y6AW220-50NZ4
R900755643 DAW20A1-5X/315-10Y6EG24N9K4
R901028732 DAW20A1-5X/315-10Y6EW230N9K4
R900512239 DAW20A1-5X/315-17-6AG24NZ4
R900539867 DAW20A1-5X/315-17-6AW220-50NZ4
R900505327 DAW20A1-5X/315-17Y6AW120-60NZ45/12
R900515868 DAW20A1-5X/315-17Y6BG24NEX
R901047658 DAW20A1-5X/315-17Y6EG24N9K4
R900560339 DAW20A2-5X/100-10-6AG24NK4
R900909199 DAW20A2-5X/100-10-6AG24NZ4
R900598141 DAW20A2-5X/100-17-6AG24NZ4
R900927371 DAW20A2-5X/100-17-6EG24N9K4
R901089439 DAW20A2-5X/100-17-6EW230N9K4
R901257867 DAW20A2-5X/100-17Y6EG24N9K4
R900968864 DAW20A2-5X/200-10-6EW230N9K4
R900532593 DAW20A2-5X/200-10Y6AG24NZ4
R900517005 DAW20A2-5X/200-17-6AG110NZ4
R900931046 DAW20A2-5X/200-17-6AG24NK4
R900566864 DAW20A2-5X/200-17-6AG24NZ4
R900566864 DAW20A2-5X/200-17-6AG24NZ4
R900577783 DAW20A2-5X/200-17-6AW220-50NZ4
R900964240 DAW20A2-5X/200-17-6EG24N9K4
R900974063 DAW20A2-5X/200-17-6EW230N9K4
R901145571 DAW20A2-5X/200-17Y6EG24N9K4
R901244882 DAW20A2-5X/315-10-6EG96N9K4
R901046847 DAW20A2-5X/315-10-6EW230N9K4
R900931443 DAW20A2-5X/315-17-6AG24NK4
R900596570 DAW20A2-5X/315-17-6AG24NZ5L
DA/DAW型先導(dǎo)控制式卸荷閥:
1.工作原理
DA/DAW型閥是先導(dǎo)控制式卸荷閥，它的作用是給蓄能補油，采用高低壓雙泵的液壓系統(tǒng)中，可使低壓泵卸荷。
該閥主要是由先導(dǎo)閥、帶主閥芯的主閥和單向閥組成。通徑10的單向閥在主閥體內(nèi)，而通徑25和32單向閥是在主閥底下的連接板內(nèi)。
DA型閥
從P→A切換到P→T
泵輸出的液流從單向閥流到閥腔(P→A)，同時通過通道流到活塞;通過阻尼器流到主閥的上腔，并且經(jīng)過阻尼器作用在錐閥上。一但系統(tǒng)壓力達到先導(dǎo)閥調(diào)定的卸荷壓力時，立即把錐閥打開。當控制油經(jīng)過阻尼器和通過Y排到T腔時，由于阻尼器和在主閥上產(chǎn)生了一個壓力降。這時主閥打開，壓力油從P腔流到T腔(P→T)。
當主閥開啟并且打開時(P→T)，由于A腔的壓力作用在柱塞(4)和單向
閥上，使得錐閥(8) 打開和單向閥關(guān)閉。這樣就完成了從P→A切換到P→T。
從P→T切換到P→A
由于柱塞(4) 的面積比錐閥(8)的有效面積大17%，所以活塞上的作用力也比錐閥上的作用力大17%。
如果蓄能器的壓力低于它相對應(yīng)的切換壓力差時，彈簧(9)將錐閥(8)關(guān)閉。這樣主閥(6)上腔建立起壓力，使主閥芯(6)關(guān)閉，即關(guān)閉了P→T。這樣泵輸出的液流重新又經(jīng)過單向閥進入到液壓系統(tǒng)。.
DAW型閥
這種閥的性能與DA型閥相同，只是在先導(dǎo)閥(2). 上有個電磁閥，可在先導(dǎo)閥調(diào)定的切換壓力下任意實現(xiàn)從A→T或T→A。
2.DA/DAW型先導(dǎo)控制式牌子荷閥常見故障及排除
(一)卸荷閥不卸荷
由于阻尼器堵塞，閥芯上腔油液無排出故在導(dǎo)閥開啟的情況下，主閥上下腔壓力相等且上端面積大于下端面積，無法開啟，P→T無油卸荷;主閥在關(guān)閉位置時卡住同樣不能卸荷;柱塞卡住無法打開導(dǎo)閥則同樣不能卸荷。
(二)非卸荷狀態(tài)下卸荷
由于阻尼器(5)堵塞閥芯上腔未有油壓作用，而主閥彈簧力很弱，故主閥芯在很小的力作用開啟而卸荷;主閥在開啟位置時卡住同樣卸荷，而控力并未達導(dǎo)閥的調(diào)定值。導(dǎo)閥活塞卡住，導(dǎo)閥常開，則亦卸荷。
(三)DAW型的電磁閥故障同樣造成上述二種故障發(fā)生。
(四)各“O”形密封圈損壞而引起各部位外泄漏。

五、壓力繼電器的常見故障及排除
壓力繼電器的常見故障是靈敏度降低和微動開關(guān)損壞等。
前者是由于閥芯、推桿的徑向卡緊，或微動開關(guān)空行程過大等引起。當閥芯或推桿發(fā)生徑向卡緊時，磨擦力增加，這個阻力與閥芯和推桿的運動方向相反，它一個方向幫助油液壓力克服彈簧力，使油液壓力降低，因而使壓力繼電器的靈敏度降低。
在使用中，由于微動開關(guān)支架變形，或零位可調(diào)部分松動，都會使原來調(diào)整好或在裝配后保證的微動開關(guān)*小空行程變大，使靈敏度降低。
壓力繼電器的泄漏如不直接接回油箱，由于泄油口背壓過高，也會使靈敏度降低。
差動式壓力繼電器，因微動開關(guān)部分和泄油腔反時，壓力即沖破橡膠隔膜進入微動開關(guān)部分，從而損壞微動開關(guān)。另外，由于調(diào)壓彈簧腔和泄油腔相通，調(diào)節(jié)螺釘處又無密封裝置，當泄油壓力過高時，在調(diào)節(jié)螺釘處會出現(xiàn)外泄漏現(xiàn)象。所以泄油腔必須直接接回油箱。
壓力繼電器是一種將油液的壓力信號轉(zhuǎn)換成電信號的小型電液控制元件。當油液壓力達到壓力繼電器的調(diào)定壓力時，即發(fā)出電信號，以控制電磁鐵、電磁離合器、繼電器等電氣元件動作，使油路卸荷、卸壓、換向、執(zhí)行機構(gòu)實現(xiàn)順序動;作，或關(guān)閉電動機，使系統(tǒng)停止工作，起到安全保護作用等。

六、單向閥、液控單向閥、SV/SL型液控單向閥、疊加式液控單向閥
1.結(jié)構(gòu)和工作原理
單向閥又稱止回閥或逆止閥。用于液壓系統(tǒng)中防止油流反向流動。單向閥有直通式和直角式兩種。如圖15、圖16所示。
SV和SL型液控單向閥都是座式閥，由液壓開啟，能給出反向流。
這種閥用來隔離局部壓力回路，即作為在管子破裂時防止負載降落的保護，也可防止負載下爬。這種液控單向閥主要包括閥體、主閥、先導(dǎo)閥、壓縮彈簧和控制活塞 。
SV型閥(無泄油口)一一泄漏油內(nèi)部回油
由A口至B口始終可以流動。反方向上則導(dǎo)閥和主閥被壓縮彈簧和系統(tǒng)壓力保持在閥座上。若X口供給壓力油則控制活塞被推向右。
這首先打開導(dǎo)閥，然后打開主閥。于是油液先通過導(dǎo)閥，然后通過主
導(dǎo)閥。為了保證用控制活塞能可靠地操縱，需要一定的*低控制壓力。
SL型閥(帶泄油口)-一-泄漏油外部回油
在原理上，此閥與SV型有相同的功能。不同之處在于增加了泄油口Y,這就可使控制活的環(huán)形面積與A口隔離。A口來的油壓只作用在控制活塞的面積A4上，從而有效地降低此條件下所需的控制壓力。
Z2S型疊加式液控單向閥
Z2S型單向閥是疊加式液控單向閥。它可用于關(guān)閉一個或兩個工作油口，無泄漏持續(xù)時間長，穩(wěn)定性好。
油液從A到A1或B到B1自由流通，反向則被截止。如果油流通過閥，例
如從A到A1，壓力油作用在閥芯上，閥芯則向右運動并推動鋼球離開閥座。單向閥被控制油打開時，油可從B1到B流通。壓力在B1腔卸荷，單向閥全部開啟。為保證兩個主單向閥在換向閥中位時能可靠的關(guān)閉，閥的A、B口與回油路連接。
2.單向閥的主要故障
單向閥可能出現(xiàn)的*主要的故障，是當油液從P2腔反向進入時，錐閥芯(或鋼球)不能將油液嚴格封閉而產(chǎn)生滲漏。這種滲漏現(xiàn)象更容易出現(xiàn)在反向流油的壓力比較低的情況。這時需要檢查閥芯錐面(或鋼球)與閥座的接觸是否緊密;或檢查閥座孔與閥芯孔是否保證所需要的同軸度要求，或者當閥座壓入閥體孔時有沒有壓歪。如不符合要求，則需將閥芯錐面(或鋼球)與閥座重新配研，或者將閥座拆出重新壓裝，直到與閥芯錐面(或鋼球)嚴密接觸為止。
另外單向閥的閥座或閥套與閥體間的密封裝配或拆裝時擠傷，而造成內(nèi)部泄漏。
如果單向閥啟閉不靈活，這種閥芯有卡阻現(xiàn)象，則需檢查閥體孔與閥芯的加工幾何精度，以及二者的配合間隙是否符合要求。這種現(xiàn)象有可能出現(xiàn)于正向開啟壓力很小的單向閥，或者這種開啟壓力很小的單向閥是閥芯軸線沿水平方向安裝使用時的場合;另外，也應(yīng)檢查彈簧是否斷裂或者過分彎曲而引起卡阻。這里應(yīng)該注意的是，不論是直通型單向閥還是直角型單向閥，都不允許閥芯錐面向上安裝。