Rexroth R910990406 柱塞泵是上海韦米机电设备有限公司主要经销产品之一，保证产品【原装正确产品】，价格优惠，货期短，发货快；常规产品现货供应，放心购买。我公司有经验经营国外进口液压气动备件、自动化仪表；主营产品：液压配件、气动元件、柱塞泵、齿轮泵、叶片泵、电磁阀、节流阀、比例阀、溢流阀、换向阀、流量阀；伺服驱动器、伺服模块、伺服电机、探头、传感器、电缆、电源模块、编码器、接近开关等。常规型号产品现货供应，热诚欢迎新老客户来电咨询采购！
液压油箱
1、 液压油箱的选用
液压油箱在液压系统中的主要作用为储油、散热、分离油中所含空气及清理泡沫。选用油箱首先要考虑其容量，一般移动式设备取泵非常大流量的2～3倍，固定式设备取3～4倍；其次考虑油箱油位，当系统全部液压油缸伸出后油箱油面不得低于较低油位，当油缸回缩以后油面不得高于较高油位；较后考虑油箱结构，传统油箱内的隔板并不能起沉淀脏物的作用，应沿油箱纵轴线安装一个垂直隔板。此隔板一端和油箱端板之间留有空位使隔板两边空间连通，液压泵的进出油口布置在不连通的一端隔板两侧，使进油和回油之间的距离较远，液压油箱多起一些散热作用。
2、 液压油箱的安装
按照安装位置的不同可分为上置式、侧置式和下置式。
上置式油箱把液压泵等装置安装在有较好刚度的上盖板上，其结构紧凑、应用较广。此外还可在油箱外壳上铸出散热翅片，加强散热效果，即提高了液压泵的使用寿命。
侧置式油箱是把液压泵等装置安装在油箱旁边，占地面积虽大，但安装与维修都很方便，通常在系统流量和油箱容量非常大时采用，尤其是当一个油箱给多台液压泵供油时使用。因侧置式油箱油位高于液压泵吸油口，故具有较好的吸油效果。
下置式油箱是把液压泵置于油箱底下，不仅便于安装和维修，而且液压泵吸入能力大为改善
力士乐节流阀，rexroth节流阀，博世力士乐节流阀，博世流量阀，博世比例阀
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R901110443 HED8OA-2X/50K14AS/12
R901110166 HED8OA-2X/50K14ASV
R901110164 HED8OA-2X/50K14av
R901110160 HED8OA-2X/50K14KSV
R901110155 HED8OA-2X/50K14KWV
R901110149 HED8OA-2X/50K14SV
R901110147 HED8OA-2X/50K14SV/12
R901109541 HED8OA-2X/630K14KS
R901109538 HED8OA-2X/630K14KW
R901109535 HED8OH-2X/100K14ASV
R901109532 HED8OH-2X/100K14KWV
R901109530 HED8OH-2X/200K14ASV
R901109074 HED8OH-2X/200K14SV
R901109071 HED8OH-2X/350K14ASV
R901109069 HED8OH-2X/350K14KWV
R901109065 HED8OH-2X/350K14SV
R901109050 HED8OH-2X/50K14ASV
R901109049 HED8OH-2X/50K14KWV
R901109035 HED8OH-2X/630K14AS
R901109029 HED8OH-2X/630K14S
R901109028 HED8OP-2X/100K14SV
R901109027 HED8OP-2X/100P070K14S
R901109004 HED8OP-2X/200K14SV
R901108531 HED8OP-2X/350K14ASV
R901108529 HED8OP-2X/630K14V
R901108522 HED8OA-2X/200K14ASV
R901108521 HED8OA-2X/200U170K14S
R901108518 HED8OA-2X/350K14A/12
R901108517 HED8OA-2X/350K14ASV
R901108512 HED8OA-2X/630K14AS
R901108268 HED8OH-2X/100K14SV
R901108265 HED8OP-2X/100K14V
R901108258 HED8OP-2X/200K14KS
R901108252 HED8OP-2X/350P140K14S
R901108249 HED8OP-2X/50K14KW
R901108245 HED8OA-2X/200K14KWV
R901108236 HED8OH-2X/350K14AS
R901108229 HED8OP-2X/100K14A
R901108147 HED8OP-2X/630K14
R901108023 HED8OP-2X/200K14A
R901108018 HED8OP-2X/200K14KW
R901108012 HED8OP-2X/50K14KS
R901108009 HED8OA-2X/350K14S/12
R901108007 HED8OH-2X/50K14A
R901108003 HED8OP-2X/200K14AS
R901108001 HED8OP-2X/50K14V
R901107999 HED8OP-2X/50K14A
R901107997 HED8OP-2X/100K14KS
R901107923 HED8OA-2X/200U120K14S
R901107922 HED8OA-2X/350K14SV
R901107915 HED8OA-2X/630K14S
R901107914 HED8OP-2X/350K14KS
R901107913 HED8OP-2X/350K14SV
R901107805 HED8OA-2X/200K14SV
R901107796 HED8OA-2X/350K14V
R901107793 HED8OA-2X/50K14/12
R901107790 HED8OP-2X/100K14AS
R901107397 HED8OP-2X/200K14V
R901107396 HED8OP-2X/50K14AS
R901107394 HED8OH-2X/50K14KW
R901107393 HED8OA-2X/200U165K14S
R901107370 HED8OP-2X/100K14KW
R901107369 HED8OH-2X/200K14KW
R901107367 HED8OA-2X/100K14V
R901107332 HED8OA-2X/350K14KW/12
R901107330 HED8OP-2X/350K14V
R901107326 HED8OP-2X/350K14A
R901107318 HED8OA-2X/200U180K14S
R901107313 HED8OH-2X/350K14A
R901107129 HED8OP-2X/350K14KW
R901107128 HED8OH-2X/100K14A
R901107127 HED8OA-2X/630K14
R901107126 HED8OA-2X/200K14KS
R901107122 HED8OH-2X/100K14KW
R901107119 HED8OH-2X/200K14AS
R901107095 HED8OH-2X/350K14KW
R901107094 HED8OA-2X/200K14A
R901107093 HED8OP-2X/200K14S
R901107091 HED8OA-2X/350K14/12
R901107087 HED8OA-2X/350K14KS
R901107086 HED8OH-2X/50K14AS
R901107083 HED8OP-2X/50K14
R901106512 HED8OA-2X/200K14/12
R901106509 HED8OP-2X/100K14S
R901106507 HED8OA-2X/50K14A
R901106505 HED8OH-2X/100K14AS
R901106504 HED8OP-2X/50K14S
R901106499 HED8OA-2X/50K14AS
R901106498 HED8OH-2X/100K14KS
R901106455 HED8OA-2X/350K14A
R901106454 HED8OH-2X/350K14KS
R901106453 HED8OP-2X/350K14
R901106452 HED8OA-2X/200K14AS
R901106449 HED8OP-2X/630K14S
R901106448 HED8OA-2X/200K14KW
R901106446 HED8OP-2X/50K14KWSO16
R901106263 HED8OA-2X/100K14ASV
R901106262 HED8OA-2X/100K14AS
R901106259 HED8OA-2X/100K14A
R901106257 HED8OA-2X/100K14/12
R901102778 HED8OA-2X/350K14S
R901102754 HED8OA-2X/50K14KW
R901102747 HED8OP-2X/100K14
R901102727 HED8OA-2X/200K14S
R901102722 HED8OA-2X/350K14AS
R901102721 HED8OP-2X/200K14
R901102716 HED8OA-2X/350K14KW
R901102713 HED8OH-2X/350K14S
R901102712 HED8OH-2X/50K14S
R901102711 HED8OA-2X/100K14S
R901102710 HED8OA-2X/350K14
R901102708 HED8OA-2X/200K14
R901102706 HED8OA-2X/100K14
R901102704 HED8OA-2X/50K14S
R901102702 HED8OA-2X/50K14KS
R901102365 HED8OP-2X/350K14S
R901102362 HED8OH-2X/200K14S
R901102360 HED8OH-2X/100K14
R901102356 HED8OH-2X/50K14KS
R901102349 HED8OH-2X/50K14
R901101698 HED8OA-2X/50K14
R901101640 HED8OH-2X/350K14
R901099817 HED8OH-2X/350K14KSV
R901099816 HED8OH-2X/350K14av
R901099815 HED8OH-2X/350K14V
R901099813 HED8OH-2X/200U150K14V
R901099811 HED8OH-2X/200K14KS
R901099809 HED8OH-2X/200K14A
R901099808 HED8OH-2X/200K14
R901099800 HED8OH-2X/50K14KSV
R901099798 HED8OH-2X/50K14av
R901099796 HED8OH-2X/50K14V
R901099792 HED8OH-2X/200K14KSV
R901099790 HED8OH-2X/200K14av
R901099789 HED8OH-2X/200K14V
R901099788 HED8OH-2X/100K14KSV
R901099780 HED8OH-2X/100K14av
R901099775 HED8OH-2X/100K14V
R901095551 HED8OA-2X/100K14KS
R901095375 HED8OH-2X/100K14S
R901094159 HED8OA-2X/100K14KW
R901091138 HED8OP-2X/350K14AS
R900571917 HED8OP1X/350K14S
R900563879 HED8OH1X/200K14
R900536049 HED8OH1X/350K14
R900049550 HED8OP1X/100K14A
R900031147 HED8OP1X/350K14KW
博世力士乐rexroth直动式溢流阀 10通径溢流阀DBDS10系列 特价供应 优势现货型号如下
R900702542 W-DBDS10K1X=50P35V
R900596810 DBDS10P1X/315/12
R900584384 E-DBDS10P1X/400V
R900576420 W-DBDS10K1X=315-210V
R900536728 DBDS10G1X/25VSO102
R900534133 DBDS10K1X/315SO138
R900526570 DBDS10G1X/50SO102
R900523060 DBDS10P1X/700
R900496034 DBDS10K1X/630V
R900491662 DBDS10P1X/400V
R900488053 DBDS10K1X/25SO52
R900481860 W-DBDS10K1X/200
R900474980 DBDS10G1X/315J
R900472963 DBDS10K1X/315SO52
R900468137 DBDS10K1X/315J
R900462393 DBDS10K1X/25V
R900458636 DBDS10G1X/200J
R900457420 DBDS10K1X/400V
R900451223 W-DBDS10K1X/315V
R900448058 DBDS10K1X/200JV
R900446684 DBDS10P1X/630V
R900441074 W-DBDS10K1X/400
R901136834 DBDS10G1X/160E
R901134562 DBDS10G1X/315VSO102
R901131882 DBDS10G1X/50VE
R901124724 DBDS10G1X/315V/12E
R901124323 DBDS10G1X/300E
R901120746 DBDS10K1X/85E
R901120480 DBDS10K1X/200P150
R901119790 DBDS10K1X/630-525
R901119783 DBDS10K1X/630-590
R901117802 DBDS10G1X/165E
R901116246 W-DBDS10K1X=200P165
R901114853 DBDS10G1X/40VE
R901111674 DBDS10P1X/60E
R901104572 DBDS10K1X/155VE
R901103352 DBDS10K1X/630-520J
R901100086 DBDS10K1X/315-240SO60
R901098077 DBDS10K1X/80VE
R901096027 DBDS10K1X/200-190
R901089636 DBDS10K1X/210JE
R901086870 DBDS10P1X/450VE
R901085795 DBDS10K1X/180JE
R901085789 DBDS10K1X/80JE
R901083487 DBDS10K1X/125E
R901083277 DBDS10K1X/260MTE
R901083276 DBDS10G1X/310E
R901081750 DBDS10G1X/315-200
R901081018 DBDS10G1X/170ESO157
R901078029 DBDS10P1X=315
R901075535 DBDS10K1X/35E
R901075509 DBDS10K1X/450VE
R901072699 DBDS10P1X/375E
R901071496 DBDS10G1X/200SO285
R901071495 DBDS10G1X/630SO285
R901071491 DBDS10G1X/315SO285
R901067253 DBDS10K1X/200P130
R901060953 DBDS10G1X/100-55
R901060443 DBDS10P1X/30E
R901055410 DBDS10K1X/315P240SO60
R901055217 DBDS10G1X/50E
R901054584 DBDS10K1X/65E
R901053481 DBDS10P1X/80E
R901040333 DBDS10G1X/60E
R901034804 DBDS10G1X/110E
R901034106 DBDS10K1X/315P200
R901030671 DBDS10K1X/315-200
R901028312 DBDS10P1X/160E
R901026426 DBDS10G1X/140E
R901024230 DBDS10K1X/75E
R901018555 DBDS10K1X/40E
R901017729 DBDS10G1X/630E
R901015106 DBDS10G1X/40E
R901014834 DBDS10K1X/400SO159
R901013662 DBDS10G1X/190E
R901012705 DBDS10G1X/250E
R901011824 DBDS10K1X/630E
R901010969 DBDS10G1X/350E
R901010836 DBDS10P1X/630E
R901008336 W-DBDS10K1X=315P230
R901005533 DBDS10K1X/480E
R901004628 DBDS10G1X/340E
R901002782 DBDS10G1X/80E
R901002576 W-DBDS10K1X=25P15
R901001991 DBDS10K1X/315VE
R901000910 DBDS10G1X/550E
R901000648 DBDS10K1X/135JE
R901000413 DBDS10K1X/340E
R901000273 DBDS10P1X/400E
R900990977 W-DBDS10K1X=400P350
R900973473 DBDS10G1X/200-110SO60
R900955031 W-DBDS10G1X/25V
R900953867 DBDS10G1X/100-70
R900953705 DBDS10G1X/200-140
R900940672 DBDS10G1X/200-150
R900940050 DBDS10G1X/315P220
R900934571 DBDS10G1X/400-350V
R900921207 DBDS10G1X/100SO102
R900919942 DBDS10G1X/315-220
R900787687 DBDS10G1X/400E
R900783706 DBDS10K1X/260VE
R900781876 DBDS10K1X/90E
R900781736 DBDS10P1X/90E
R900780315 DBDS10P1X/500E
R900780314 DBDS10P1X/100E
R900779823 DBDS10K1X/520E
R900779659 DBDS10G1X/520E
R900778434 DBDS10P1X/315E
R900778127 DBDS10K1X/130E
R900778044 DBDS10G1X/130E
R900777683 DBDS10K1X/250MTE
R900777079 DBDS10G1X/30E
R900776495 DBDS10K1X/200-120
R900775673 DBDS10K1X/380JE
R900775512 DBDS10P1X/110E
R900775126 DBDS10K1X/290E
R900774665 DBDS10K1X/25-15
R900774524 DBDS10K1X/120E
R900773947 DBDS10K1X/265E
R900773478 DBDS10K1X/320E
R900773231 DBDS10K1X/305E
R900773229 DBDS10G1X/280E
R900773214 DBDS10K1X/30E
R900773199 DBDS10K1X/110E
R900773196 DBDS10K1X/60E
R900773194 DBDS10P1X/210E
R900773193 DBDS10K1X/170E
R900773192 DBDS10G1X/170E
R900773011 DBDS10K1X/420E
R900772782 DBDS10G1X/120E
R900772555 DBDS10K1X/230VE
R900772554 DBDS10K1X/230E
R900772546 DBDS10K1X/200VE
R900772544 DBDS10K1X/180VE
R900772540 DBDS10K1X/160VE
R900772508 DBDS10K1X/170VE
R900772488 DBDS10K1X/220VE
R900772486 DBDS10K1X/120VE
R900772319 DBDS10G1X/220E
R900772168 DBDS10P1X/200E
R900772156 DBDS10K1X/80E
R900772073 DBDS10K1X/270E
R900769619 DBDS10G1X/100E
R900769612 DBDS10K1X/315JE
R900769611 DBDS10K1X/240E
R900769606 DBDS10G1X/180E
R900769596 DBDS10K1X/550E
R900769595 DBDS10K1X/50E
R900769589 DBDS10K1X/380E
R900769588 DBDS10K1X/310E
R900769581 DBDS10K1X/280E
R900769576 DBDS10K1X/100VE
R900769572 DBDS10K1X/360E
R900769571 DBDS10K1X/250VE
R900769565 DBDS10G1X/230E
R900769561 DBDS10G1X/500E
R900769557 DBDS10K1X/220E
R900769551 DBDS10K1X/500E
R900769546 DBDS10K1X/375E
R900769543 DBDS10P1X/350E
R900769542 DBDS10K1X/180E
R900769540 DBDS10G1X/200E
R900769533 DBDS10K1X/100JE
R900769516 DBDS10K1X/450E
R900769515 DBDS10K1X/175E
R900769509 DBDS10G1X/330E
R900769507 DBDS10G1X/150E
R900769440 DBDS10P1X/330E
R900769439 DBDS10K1X/345E
R900769437 DBDS10K1X/400E
R900769430 DBDS10G1X/315E
R900769419 DBDS10K1X/70E
R900769414 DBDS10K1X/160E
R900769413 DBDS10G1X/70E
R900769405 DBDS10K1X/150E
R900769399 DBDS10K1X/350E
R900769381 DBDS10K1X/260E
R900769380 DBDS10K1X/300E
R900769379 DBDS10G1X/210E
R900769364 DBDS10K1X/100E
R900769281 DBDS10K1X/200E
R900769280 DBDS10K1X/250E
R900769279 DBDS10K1X/315E
R900769276 DBDS10K1X/210VE
R900769274 DBDS10K1X/330VE
R900768636 DBDS10K1X/210E
R900768630 DBDS10K1X/140E
R900768628 DBDS10K1X/330E
R900761777 W-DBDS10K1X/400P350
R900757327 DBDS10K1X/100-080
R900753435 DBDS10G1X/200W100
R900751255 W-DBDS10K1X=200P150
R900740685 DBDS10K1X/630-500
R900719811 DBDS10K1X/400-280
R900437349 DBDS10G1X/400V
R900435016 DBDS10P1X/200V
R900432168 DBDS10P1X/630
R900428976 DBDS10G1X/630V
R900427940 DBDS10K1X/200V
R900427601 DBDS10K1X/630
R900427244 DBDS10P1X/50V
R900426905 DBDS10P1X/25
R900425661 DBDS10P1X/50
R900425660 DBDS10P1X/400
R900424745 DBDS10G1X/50
R900424744 DBDS10G1X/400
R900424743 DBDS10G1X/315V
R900424742 DBDS10G1X/315
R900424741 DBDS10G1X/200V
R900424739 DBDS10G1X/100V
R900424738 DBDS10G1X/100
R900424159 DBDS10P1X/315V
R900424158 DBDS10P1X/315
R900424157 DBDS10P1X/200
R900424156 DBDS10P1X/100V
R900424155 DBDS10P1X/100
R900424154 DBDS10K1X/50V
R900424153 DBDS10K1X/50
R900424152 DBDS10K1X/400
R900424151 DBDS10K1X/315V
R900424150 DBDS10K1X/315
R900424149 DBDS10K1X/200
R900424148 DBDS10K1X/100V
R900424147 DBDS10K1X/100
R900424146 DBDS10G1X/50V
R900424140 DBDS10G1X/200
R900423889 DBDS10G1X/25V
R900423814 DBDS10G1X/630
R900423743 DBDS10G1X/25
R900420276 DBDS10K1X/25
R900415428 W-DBDS10K1X/315
R900415335 W-DBDS10G1X/315
R900413874 DBDS10K1X/200SO60
R900406017 DBDS10G1X/200SO60
R900403980 DBDS10K1X/100J
R900402543 DBDS10K1X/200SO52
R900396880 DBDS10K1X/100JV
R900391754 DBDS10K1X/25JV
R900391665 DBDS10K1X/50JV
R900389590 DBDS10G1X/200SO52
R900382014 DBDS10K1X/400SO60
R900381271 DBDS10K1X/400J
R900377746 DBDS10G1X/315/12
R900372835 DBDS10K1X/200VSO60
R900370594 DBDS10P1X/200J
R900368297 W-DBDS10K1X/25
R900366546 DBDS10K1X/1000SO99
R900351428 W-DBDS10K1X/100
R900344473 DBDS10K1X/25J
R900343963 DBDS10G1X/200V/12
R900341591 DBDS10G1X/200/12
R900341363 DBDS10G1X/100/12
R900340488 DBDS10G1X/315V/12
R900339705 DBDS10K1X/315SO60
R900334743 DBDS10G1X/100SO60
R900334665 DBDS10K1X/200J
R900769440 DBDS10P1X/330E
R900769381 DBDS10K1X/260E
R900769279 DBDS10K1X/315E
R900300112 VERSTELLUNGDBDS10K13/
R900248925 W-DBDS10G1X/400
R900243276 W-DBDS10K1X=315P210V
R900227371 DBDS10K1X/315VSO60
R900224220 DBDS10K1X/400-350
R900219731 DBDS10K1X/630VSO151
R900219050 DBDS10K1X/315-260
R900219049 DBDS10K1X/630-440
R900215388 DBDS10K1X/315P315
R900209701 W-DBDS10K1X=315P210
R900208673 DBDS10K1X/25-10
R900207135 W-DBDS10K1X=200P160
R900205410 DBDS10K1X/315P270
R900203648 DBDS10K1X/400-340
R900202967 DBDS10K1X/400-330
R900058358 DBDS10K1X/315-220
R900055923 DBDS10K1X/400P350
R900053461 DBDS10K1X/315VSO102
R900052942 DBDS10K1X/200-150
R900051488 DBDS10K1X/25-20
R900051396 DBDS10K1X/200-145
R900050147 W-DBDS10K1X=400P330V
R900772168 DBDS10P1X/200E
R900462393 DBDS10K1X/25V
R900427940 DBDS10K1X/200V
R900426905 DBDS10P1X/25
R900425661 DBDS10P1X/50
R900425660 DBDS10P1X/400
R900424745 DBDS10G1X/50
R900424744 DBDS10G1X/400
R900424742 DBDS10G1X/315
R900424738 DBDS10G1X/100
R900424159 DBDS10P1X/315V
R900424158 DBDS10P1X/315
R900424157 DBDS10P1X/200
R900424155 DBDS10P1X/100
R900424153 DBDS10K1X/50
R900424152 DBDS10K1X/400
R900424151 DBDS10K1X/315V
R900424150 DBDS10K1X/315
R900424149 DBDS10K1X/200
R900424148 DBDS10K1X/100V
R900424147 DBDS10K1X/100
R900424140 DBDS10G1X/200
R900423743 DBDS10G1X/25
R900420276 DBDS10K1X/25
R900402543 DBDS10K1X/200SO52
R900339705 DBDS10K1X/315SO60
R900219731 DBDS10K1X/630VSO151
R900058358 DBDS10K1X/315-220
力士乐直动式溢流阀 20通径溢流阀DBDS20系列
R901092803 DBDS20K1X/315-230
R900702785 DBDS20K1X/315P230
R900617276 DBDS20K1X/315-315
R900588153 DBDS20K1X/25VSO60
R900561430 DBDS20K1X/315JV
R900539105 DBDS20P1X/200/12
R900538976 DBDS20K1X/200SO140
R900536979 DBDS20G1X/100SO74
R900533255 DBDS20K1X/100JV
R900497804 DBDS20K1X/25SO52
R900489216 W-DBDS20K1X/25
R900488859 DBDS20K1X/25VSO52
R900486899 DBDS20K1X/200SO60
R900486517 DBDS20K1X/25J
R900486516 DBDS20K1X/100J
R900478766 DBDS20G1X/400V
R900474243 DBDS20K1X/25V
R900462896 DBDS20G1X/25V
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柱塞泵柱塞往复运动总行程L是不变的，由凸轮的升程决定。柱塞每循环的供油量大小取决于供油行程,供油行程不受凸轮轴控制是可变的。供油开始时刻不随供油行程的变化而变化。转动柱塞可改变供油终了时刻，从而改变供油量。柱塞泵工作时，在喷油泵凸轮轴上的凸轮与柱塞弹簧的作用下，迫使柱塞作上、下往复运动，从而完成泵油任务，泵油过程可分为以下两个阶段。
进油过程
当凸轮的凸起部分转过去后，在弹簧力的作用下，柱塞向下运动，柱塞上部空间（称为泵油室）产生真空度，当柱塞上端面把柱塞套上的进油孔打开后，充满在油泵上体油道内的柴油经油孔进入泵油室，柱塞运动到下止点，进油结束
回油过程
柱塞向上供油，当上行到柱塞上的斜槽（停供边）与套筒上的回油孔相通时，泵油室低压油路便与柱塞头部的中孔和径向孔及斜槽沟通，油压骤然下降，出油阀在弹簧力的作用下迅速关闭，停止供油。此后柱塞还要上行，当凸轮的凸起部分转过去后，在弹簧的作用下，柱塞又下行。此时便开始了下一个循环。
柱塞泵以一个柱塞为原理介绍，一个柱塞泵上有两个单向阀，并且方向相反，柱塞向一个方向运动时缸内出现负压，这时一个单向阀打开液体被吸入缸内，柱塞向另一个方向运动时，将液体压缩后另一个单向阀被打开，被吸入缸内的液体被排出。这种工作方式连续运动后就形成了连续供油。