力士乐柱塞式压力继电器HED8OA-20/100K14

HED8类型的液压-电气压力开关是柱塞式压力开关。它们的基本构成是壳体、带柱塞的安装套件、压缩弹簧、调节元件和微动开关。
如果要监测的压力低于调定值，则操作微动开关。要监测的压力通过节流孔传到柱塞。柱塞受弹簧座支持并克服压缩弹簧不断变化的作用力。弹簧座将柱塞的运动传输到微动开关，并在达到调定压力时释放后者的压力。这将打开或关闭电路，取决于电路的设置。弹簧座的机械前挡块在压力突然降低和过压的情况下，可保护微动开关免于受到机械损伤，并防止压缩弹簧的过压。
要延长使用寿命，安装压力开关时应确保振动较小，使其免于受到液压冲击。

液压-电气压力开关：
特点：
→用于底板安装
→用于 G1/4" 管道安装
→用于法兰连接，符合 ISO 16873 标准
→作为垂直叠加元件，与阀板相连接，符合 ISO 4401 标准
→5 个压力等级
→4 种调整类型：
→带/不带保护帽的调节杆
→带刻度的调节杆，带/不带保护帽
→带刻度旋钮
→带刻度可锁定旋钮
→电气连接
– 带有 A 设计的阀连接器
（大型方形连接器）
– 带 M12 x 1 连接器
→带常闭/常开触点功能的微动开关
→电流零电位转换（1 mA 至 2 A）
→压力范围经过 UL 认证，高达 350 bar


液压-电气压力继电器型号详情举例：
HED8OH-2X/350K14KW
1、
HED8  →柱塞式压力开关
2、
OH    →法兰连接
OP    →底板安装
OA    →管道安装
2、
2X    →组件系列 20 … 29（20 … 29：安装和连接尺寸不变）
4、
350   →最大压力等级 350 bar
50    →最大压力等级 50 bar
100   →最大压力等级 100 bar
200   →最大压力等级 200 bar
630   →最大压力等级 630 bar
5、电气连接，单个连接
K14   →不带连接插头，连接器DIN EN 175301-803
K35   →不带连接插头，连接器 IEC 61076-2-101，M12 x 1
6、调整类型
无代码  →内六角调节杆，不带刻度，不带保护帽
S       →内六角调节杆，不带刻度，带保护帽，密封
A       →带刻度调节杆，不带保护帽
AS      →带刻度调节杆，带保护帽
KS      →带刻度可锁定旋钮
KW      →带刻度旋钮
7、密封材料
无代码  →NBR 密封件
V       →FKM 密封件
MT      →低温密封件（最大 315 bar） 
请务必遵守密封件与所用液压油的兼容性！
1) 阀板用于垂直叠加，单独订购，请参阅附件
2) 不允许用于垂直叠加，不带低温密封件，未经过 UL 认证
3) 连接插头，单独订购，
4) H 钥匙，物料号 R900008158，包括在交付范围内
5) 只能使用压力计（刻度用于指示作用）精确设置切换压力
​

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压力继电器用途性能
压力继电器是一种将油液的压力信号转换成电信号的液一电转换元件。当油液压力达到压力继电器的调定压力时，能自动接通或断开电路，使电磁铁、继电器、电动机等电气元件通电运转或断电停止工作，以实现对液压系统工作程序的控制、安全保护或元件动作的联锁等。任何压力继电器都是由压力一位移转换装置和微动开关两部分组成的，按压力一位移转换装置的结构划分，有柱塞式、弹簧管式、膜片式和波纹管式四类


压力继电器是利用液体的压力来启闭电气触点的液压电气转换元件。当系统压力达到压力继电器的调定值时，发出电信号，使电气元件（如电磁铁、电机、时间继电器、电磁离合器等）动作，使油路卸压、换向，执行元件实现顺序动作，或关闭电动机使系统停止工作，起安全保护作用等。

​压力继电器的常见故障及排除
压力继电器的常见故障是灵敏度降低和微动开关损坏等。
前者是由于阀芯、推杆的径向卡紧，或微动开关空行程过大等引起。当阀芯或推杆发生径向卡紧时，磨擦力增加，这个阻力与阀芯和推杆的运动方向相反，它一个方向帮助油液压力克服弹簧力，使油液压力降低，因而使压力继电器的灵敏度降低。
在使用中，由于微动开关支架变形，或零位可调部分松动，都会使原来调整好或在装配后保证的微动开关最小空行程变大，使灵敏度降低。
压力继电器的泄漏如不直接接回油箱，由于泄油口背压过高，也会使灵敏度降低。
差动式压力继电器，因微动开关部分和泄油腔反时，压力即冲破橡胶隔膜进入微动开关部分，从而损坏微动开关。另外，由于调压弹簧腔和泄油腔相通，调节螺钉处又无密封装置，当泄油压力过高时，在调节螺钉处会出现外泄漏现象。所以泄油腔必须直接接回油箱。
压力继电器是一种将油液的压力信号转换成电信号的小型电液控制元件。当油液压力达到压力继电器的调定压力时，即发出电信号，以控制电磁铁、电磁离合器、继电器等电气元件动作，使油路卸荷、卸压、换向、执行机构实现顺序动;作，或关闭电动机，使系统停止工作，起到安全保护作用等。

力士乐柱塞式压力继电器HED8OA-20/100K14​

力士乐REXROTH柱塞式压力继电器电液控制
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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)
​压力继电器有柱塞式、膜片式、弹簧管式和波纹管式四种结构形式。下面对柱塞式压力继电器的工作原理作一介绍：
当从继电器下端进油口3进入的液体压力达到调定压力值时，推动柱塞2上移，此位移通过杠杆放大后推动微动开关4动作。改变弹簧1的压缩量，可以调节继电器的动作压力。
应用场合：用于安全保护、控制执行元件的顺序动作、用于泵的启闭、用于泵的卸荷。
注意： 压力继电器必须放在压力有明显变化的地方才能输出电信号。若将压力继电器放在回油路上，由于回油路直接接回油箱，压力也没有变化，所以压力继电器也不会工作。
选用标准
根据所测对象的压力来选用,比如所测压力范围在8KG以内,那么就要选用额定10KG的压力继电器,还有要符合电路中的额定电压,接口管径的大小
3使用方法
首先用于安全保护时，将压力继电器设置在夹紧液压缸的一端，液压泵启动后，首先将工件夹紧，此时夹紧液压缸的右腔压力升高，当升高到压力继电器的调定值时，压力继电器动作，发出电信号使2YA通电，于是切削液压缸进刀切削。在加工期间，压力继电器微动开关的常开触点始终闭合。若工件没有夹紧，压力继电器2断开，于是2YA断电，切削液压缸立即停止进刀，从而避免工件未夹紧被切削而出事故。 
其实用于控制执行元件的顺序动作时，液压泵启动后，首先2YA通电，液压缸左腔进油，推动活塞方向右移。当碰到限位器(或死挡铁)后，系统压力升高，压力继电器发出电信号，使1YA通电，高压油进入液压缸的左腔，推动活塞右移。这时若3YA也通电，液压缸的活塞快速右移;若3YA断电，则液压缸的活塞慢速右移，其慢速运动速度由节流阀调节。
再次用于液压泵卸荷时，压力继电器不是控制液压泵停止转动，而是控制二位二通电磁阀，将液压泵5输出的压力油流回油箱，使其卸荷。
后用于液压泵的启闭时，有两个液压泵，高压小流量泵，低压大流量泵。当活塞快速下降时，两泵同时输出压力油。当液压缸活塞杆抵住工件开始加压时，压力继电器在压力油作用下发出动作，触动微动开关，将常闭触点断开，使液压泵停转。在加工过程中减慢液压缸的速度，同时减少动力消耗。

液压蓄能器的作用和主要用途
1.存贮能量，应急液压
蓄能器被广泛利用作辅助能源，与压力继电器组合使用，在间歇工作的场合，可作为辅助能源，实现液压泵的小型化并可节省能源，如钢厂炼钢炉的倾转液压系统。
2.吸收脉动，平稳系统
液压泵排出的液体都具有较大的脉动，这种脉动会使液压系统产生噪声、振动，并破坏系统的工作稳定性;在液压泵出口处使用蓄能器可以有效的衰减脉动，使装置平稳的工作，这在某些精密设备中犹为重要。
3.吸收冲击，保护回路
在液压回路中，由于液压阀急速闭合而发生载荷剧变;这种剧变会产生很大的瞬间冲击压力会破坏管道、连接接头或其它液压元件，并产生剧烈的振动和噪声;使用蓄能器可有效缓和冲击，保护液压装置。如压铸机、高空混凝土输送机中液压系统中使用的蓄能器就很好的体现了这一功能。
4.热膨胀消减泄漏补偿
在压力控制的闭式回路中，使用蓄能器可有效的补偿温度降低、内部泄漏或外部泄漏而引起的压力降低;也可有效控制由于温度升高而引起的压力上升、从
而使系统稳定的工作。
5.吸收振动，减振平衡
蓄能器中胶囊充满气体可起到气体弹簧的作用，可吸收来自汽车、提升机、移动吊车等驱动和悬挂系统的机械振动，保持车辆的平稳性。
6.液体或液气分隔传送
使用蓄能器可实现两种不相容的液体或液体与气体之间的能量传递，进行隔绝输送。蓄能器是贮存高压油的装置，当泵处于正常的无负荷状态或空转状态，就可给蓄能器充油。
蓄能器贮存的高压油在需要时可以释放出来，补充泵的流量，或在停泵时给系统供油。我们现使用的蓄能器大多为隔膜式和气囊式；蓄能器靠压缩惰性气体来贮存能量，通常采用氮气，实际充气压力不能高于临界值，大多数场合，充气压力值应在系统高压力值的1/3到1/2的范围内，这样效果好，回路工作特性很少变化。特别强调的是，不要使用氧气或含氧气的混合气体。
充氮气是因为氮气稳定，不会引起火灾或其他危险因素。充气压力约为工作压力百分之六十五左右。
蓄能器里有一个皮囊，里装氮气，在皮囊与蓄能器之间是液压油。​