上海韦米机电设备有限公司

R901393577 OD.02.36.01 .30.0C.00机械行走插装阀 德国力士乐REXROTH插装阀 插装电磁阀 原装现货

我公司现货供应博世力士乐（BOSCH-REXROTH）、阿托斯ATOS、派克Parker、迪普马DUPLOMATIC、油研YUKEN;本特利bentley、贝加莱B&R、西门子、光洋KOYO，美国ASCO，美国PARKER派克 等系列进口产品 

R901393577 OD.02.36.01 .30.0C.00机械行走插装阀 

基本结构

二通插装阀与普通液压阀的功能相同，都是用来控制液压系统工作介质的压力、流量和流动方向的。二通插装阀由插入元件、先导元件、控制盖板和插装块体四部分组成。插入元件主要由阀芯、阀套、弹簧和密封件组成，图1为其示意图。控制盖板上,根据插装阀的不同控制功能，安装有相应的先导控制级元件，以实现对液压系统压力、流量和方向的控制,插装块体则既是嵌入插入元件及安装控制盖板的基础阀体，又是主油路和控制油路的通道体。

二通插装阀通过不同的盖板和各种先导阀(一般为滑阀)组合，即可构成方向控制阀、压力控制阀和流量控制阀。

插装阀单元的工作状态 记油口A、B、x的压力分别为pA、pB、px， 作用面积分别为AA、AB、Ax， 阀芯上端复位弹簧力为Ft ， 当 pxAx Ft >pAAA pBAB 时 阀口关闭 ； 当 pxAx Ft ≤ pAAA pBAB 时 阀口开启。

实际工作时，阀芯的受力状况是通过油口x的通油方式控制的。

X通回油箱，阀口开启；

x与进油口相通，阀口关闭。

改变油口通油方式的阀称为先导阀。

三通阀 由两个方向阀组件并联而成，对外形成一个压力油口、一个工作油口和一个回油口。三通插装阀的工作状态数取决于先导换向阀的工作位置数。

四通阀由两个三通阀并联而成

先导阀可以是一个三位四通换向阀

先导阀也可以是两个二位四通换向阀或四个二位三通换向阀

四通插装阀的工作状态数取决于先导换向阀的工作位置数。

插装阀液压系统实例分析

二通插装阀以其独特的优点以及经济和技术上的明显优势被广泛应用到各个行业。在集成的液压元件中，当通径小于32mm时，可采用叠加

阀，当通径大于中32mm时，应考虑采用插装阀。在一个液压系统中,可根据需要，液压控制阀全部采用二通插装阀;也可以部分液压控制阀采用滑阀式，另一部分液压控制阀采用二通插装阀，充分发挥两种液压控制阀各自的优点。

压力机械属于重型机械，主要应用于冶金行业.重型机械制造、化工等行业，如冲压机、锻造机、剪切机、粉末制品压力机、挤压机等。压力机械的动力及控制部分多数采用液压传动,由于液压系统所需的压力高、流量大，故适于用二通插装阀来控制液压系统的压力、流量和流动方向。

R901393577 OD.02.36.01 .30.0C.00机械行走插装阀型号

德国力士乐REXROTH螺纹插装阀电磁阀订货号物料号和型号：

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R930073770 OD153318D100000-VEI-016-NC-08A-D-33-0000

R930073920 OD150518A000030-VEI-016-NC-08A-A-05-0000

R930075659 OD151117A000010-VEI-016-NC-12G-A-11-0000

R930076093 OD150121DP00000-VEI-016-NC-16G-D-01-P000

R930076177 OD150518A0000I0-VEI-I016-NC-08A-A05-0000

R930076178 OD150118A0000I0-VEI-I016-NC-08A-A01-0000

R930076179 OD150518D0000I0-VEI-I016-NC-08A-D05-0000

R930076180 OD150618A0000I0-VEI-I016-NO-08A-A06-0000

R930076181 OD150618B0000I0-VEI-I016-NO-08A-B06-0000

R930076182 OD150518A8000I0-VEI-IS16-NC-08A-A05-0000

R930076206 OD151017A000000-VEI-016-NO-12G-A-10-0000

R930076233 OD150518AS00000-VEI-016-NC-08A-A-05-0000

R930076464 OD1531756205OC1-VEI7A2T14.M75K31.75NCL6&

R930076579 OD150636GP00000-VEI-016-NO-10A-G-06-P000

R930076729 OD153136DV00000-VEI-016-NC-10A-D-31-V000

R930076887 OD150118A0000L0-VEI-L016-NC-08A-A01-0000

R930076888 OD150518A0000L0-VEI-L016-NC-08A-A05-0000

R930076992 OD150118D0000L0-VEI-L016-NC-08A-D01-0000

R930076993 OD150718D0000L0-VEI-L016-NC-08A-D07-0000

R930077108 OD151018CP00000-VEI-016-NO-08A-C-10-P000

R930077397 OD150718D0AOC00-VEI-016-NC-08A-D-07-0AOC

R930078192 OD150239A000000-VEI-016-NO-08F-A-02-0000

R930078218 OD153218AP00000-VEI-016-NO-08A-A-32-P000

R930078322 OD150518E0000T0-VEI-T016-NC-08A-E-05-00&

R930078395 OD150336E000000-VEI-016-NC-10A-E-03-0000

R930078445 OD153218AV00000-VEI-016-NO-08A-A-32-V000

R930078704 OD150418A0HOC00-VEI-016-NO-08A-A-04-0HO

R930078848 OD150518A0AOC01-VEI-016-NC-08A-A-05-0AOC

R930079171 OD150589AV00000-VEI-016-NC-12A-A-05-V000

R930079399 OD153289A0DOC00-VEI-016-NO-12A-A-32-0DOC

R930079400 OD151121A0DOC00-VEI-016-NC-16G-A-11-0DOC

R930079401 OD153136A0DOC00-VEI-016-NC-10A-A-31-0DOC

R930080149 OD150221AV00000-VEI-016-NO-16G-A-02-V000

R930080150 OD150418AV00000-VEI-016-NO-08A-A-04-V000

R934000104 OD1531183AS800-VEI8A2T06.M18K31.3ANCC21&

R934000107 OD1531183DS800-VEI8A2T06.M18K31.3DNCC21&

R934000679 OD1501173DS000-VEI8A2A09.17K01.3DNCC222&

R934000693 OD1501183IS001 VEI8I2A06.18K01.3INCC218&

R934000704 OD1501193AS000-VEI8A2A06.19K01.3ANCC218&

R934000707 OD1501213AS800-VEI8A2A12M.21K01.3ANCC22&

R934000716 OD1501903IS000-VEI8I2A06.90K01.3INCC218&

R934000718 OD1502171AS000-VEI8A2A09.17K02.1ANAC220&

R934000721 OD1502171BS000-VEI8A2A09.17K02.1BNAC220&

R934000733 OD1502181BS100 VEI8A2A06.18K02.1BNAC220&

R934000739 OD1502181IS001 VEI8I2A06.18K02.1ISNAC21&

R934000747 OD1502181MS100 VEI8I2A06.18K02.1MNAC218&

R934000758 OD1502211CS000-VEI8A2A12.21K02.1CNAC225&

R934000759 OD***请点击商铺导航 联系我们***0-VEI7A2A14.21K02.54NAL630&

R934000762 OD1502901IS000 VEI8I2A06.90K02.1INAC218S

R934000764 OD1503043AS000-VEI8A2B16.04K03.3ANCC218&

R934000766 OD1503043BS000 VEI8A2B16.04K03.3BNCC218S

R934000773 OD1503173AS800-VEI8A2B09M17K03.3ANCC222&

R934000775 OD1506891AS001-VEI8A2A12V89K06.1ANAC225&

R934000779 OD1503183AS000-VEI8A2B06.18K03.3ANCC218&

R934000781 OD1503183BS000 VEI8A2B06.18K03.3BNCC218S

R934000786 OD1503193DS000-VEI8A2B06.19K03.3DNCC218&

R934000787 OD1506891BS001-VEI8A2A12.V89K06.1BNAC22&

R934000792 OD1503213DS000-VEI8A2B12.21K03.3DNCC225&

R934000809 OD1504171CS000-VEI8A2B09.17K04.1CNAC220&

R934000820 OD1504211CS000-VEI8A2B12.21K04.1CNAC225&

R934000821 OD***请点击商铺导航 联系我们***0-VEI7A2B14.21K04.54NAL630&

R934000827 OD1504761AS000-VEI8A2B09.76K04.1ANAC220&

R934000831 OD1504891CS001-VEI8A2B12.V89K04.1CNAC22&

R934000842 OD1505173BS000 VEI8A2A09.17K05.3BNCC222S

R934000844 OD1505173CS100-VEI8A2A09.17K05.3CNCC222&

R934000846 OD1505173DS800-VEI8A2A09M17K05.3DNCC222&

R934000849 OD15051798OC00-VEI8A2A09.17K05.98NCAX18&

R934000850 OD15051798ON00 VEI8A2A09.17K05.98NCAX20S

R934000863 OD1505183A0000 VEI8A2A06.18K05.3ANCC218S

R934000865 OD1505183AS001-VEI8A2A06.18K05.-S8A/12D&

R934000868 OD1505183AS005-VEI8A2A06V18K05.3ANCC218&

R934000875 OD1505183CS003 VEI8A2A06S18K05 S8H/12DC

R934000877 OD1505183CS200-VEI8A2A06.18K05.3CNCC218&

R934000890 OD15051898OC00-VEI8A2A06.18K05.98NCAX18&

R934000893 OD***请点击商铺导航 联系我们***0 VEI8I2A06.19K05.31NCC218&

R934000895 OD1505193AS000 VEI8A2A06.19K05.3ANCC218&

R934000898 OD1505193DS000 VEI8A2A06.19K05.3DNCC218&

R934000902 OD1505213A0000 VEI8A2A12.21K05.3ANCC225S

R934000913 OD1505216284OC VEI8A2A12M21K05.62NCC630S

R934000914 OD***请点击商铺导航 联系我们***0-VEI7A2A14.21K05.75NCL630&

R934000917 OD15052198OC00-VEI8A2A12.21K05.98NCAX26&

R934000953 OD1506171AS001-VEI8A2A09.17K06.1ANAC220&

R934000956 OD1506171CS000-VEI8A2A09.17K06.1CNAC220&

R934000958 OD15061796OC00-VEI8A2A09.17K06.96NAAX18&

R934000963 OD1506181A0000 VEI8A2A06.18K06.1ANAC218S

R934000969 OD1506181AS300-VEI8A2A06.18K06.1ANAC218&

R934000974 OD1506181BS100 VEI8A2A06.18K06.1BNAC218&

R934000977 OD1506181CS100-VEI8A2A06.18K06.1CNAC218&

R934000978 OD1506181CS200-VEI8A2A06.18K06.1CNAC218&

R934000982 OD1531893AS001-VEI8A2T12.V89K31.3ANCC22&

R934000985 OD15061896OC00-VEI8A2A06.18K06.96NAAX18&

R934000989 OD1506191AS000 VEI8A2A06.19K06.1ANAC218&

R934000991 OD1506191CS000-VEI8A2A06.19K06.1CNAC218&

R934000995 OD1506211A0000 VEI8A2A12.21K06.1ANAC225S

R934000998 OD1506211BS100-VEI8A2A12.21K06.1BNAC225&

R934001001 OD***请点击商铺导航 联系我们***0-VEI7A2A14.21K06.54NAL630&

R934001002 OD15062196OC00-VEI8A2A12.21K06.96NAAX26&

R934001004 OD1506361A0000 VEI8A2A09.36K06.1ANAC220S

R934001015 OD***请点击商铺导航 联系我们***0 VEI8A2A09.76K06.19NAC218S

R934001016 OD1506761AS001-VEI8A2A09.76K06.1ANAC218&

R934001018 OD1506761CS000-VEI8A2A09.76K06.1CNAC220&

R934001019 OD1506761CS100-VEI8A2A09.76K06.1CNAC218&

R934001038 OD1509173AS000-VEI8A2B09.17K09.3ANCC222&

R934001039 OD1509173DS000-VEI8A2B09.17K09.3DNCC222&

R934001051 OD1510171AS000-VEI8A2B09.17K10.1ANAC220&

R934001052 OD1510171CS000-VEI8A2B09.17K10.1CNAC220&

R934001061 OD1510211BS000-VEI8A2B12.21K10.1BNAC225&

R934001067 OD1510921CS000-VEI8A2B06.92K10.1CNAC225&

R934001071 OD***请点击商铺导航 联系我们***0 VEI8A2A09.17K11.37NCC218S

R934001072 OD1511173AS000-VEI8A2A09.U17K11.3ANCC22&

R934001073 OD1511173AS001-VEI8A2A09.V17K11.3ANCC22&

R934001075 OD1511173DS000-VEI8A2A09.U17K11.3DNCC22&

R934001090 OD1512171AS000-VEI8A2A09.U17K12.1ANAC22&

R934001100 OD1512211AS000-VEI8A2A12.U21K12.1ANAC22&

R934001101 OD1512211BS000-VEI8A2A12.U21K12.1BNAC22&

R934001102 OD1512211CS000-VEI8A2A12.U21K12.1CNAC22&

R934001113 OD1531173A0000 VEI8A2T09.17K31.3ANCC222S

R934001115 OD1531173AS001-VEI8A2T09.V17K31.3ANCC22&

R934001116 OD1531173AS800-VEI8A2T09.M17K31.3ANCC22&

R934001119 OD1531173BS000 VEI8A2T09.17K31.3BNCC222S

R934001120 OD1531173DS000-VEI8A2T09.17K31.3DNCC222&

R934001122 OD15311798OC00-VEI8A2T09.17K31.98NCAX18&

R934001125 OD1531183A0000-VEI8A2T06.18K31.3ANCC218S

R934001127 OD1531183AS001-VEI8A2T06.18K31-S8H/12DC

R934001129 OD1531183AS100-VEI8A2T06.18K31.3ANCC218&

R934001131 OD1531183BS000 VEI8A2T06.18K31.3BNCC218S

R934001142 OD15311898OC00-VEI8A2T06.18K31.98NCAX18&

R934001146 OD1531213A0000 VEI8A2T12.21K31.3ANCC225S

R934001150 OD1531213BS000 VEI8A2T12.21K31.3BNCC225S

R934001154 OD***请点击商铺导航 联系我们***0-VEI7A2T14.21K31.75NCL630&

R934001155 OD***请点击商铺导航 联系我们***0-VEI7A2T14.M21K31.75NCL63&

R934001156 OD15312198OC00-VEI8A2T12.21K31.98NCAX26&

R934001158 OD1531363A0000 VEI8A2T09.36K31.3ANCC222S

R934001168 OD1531753BS000 VEI8A2T12.75K31.3BNCC225S

R934001184 OD1532171A0000 VEI8A2T09.17K32.1ANAC220S

R934001186 OD1532171AS001-VEI8A2T09.V17K32.1ANAC22&

R934001189 OD1532171CS000-VEI8A2T09.17K32.1CNAC220&

R934001196 OD1532181A0000 VEI8A2T06.18K32.1ANAC218S

R934001199 OD1532181AS100-VEI8A2T06.18K32.1ANAC220&

R934001200 OD1532181B0000 VEI8A2T06.18K32.1BNAC218S

R934001204 OD15321896OC00-VEI8A2T06.18K32.96NAAX18S

R934001205 OD1505176205OC VEI7A2A09S17K05.62NCL622&

R934001206 OD1506171DS2OC-VEI8A2A09.S17K06.1DNAC22&

R934001208 OD1506211DS2OC-VEI8A2A12.S21K06.1DNAC22&

R934001212 OD1532211A0000 VEI8A2T12.21K32.1ANAC225S

R934001219 OD15322196OC00 VEI8A2T12.21K32.96NAAX26S

R934001224 OD1505216285OC-VEI7A2A12.M21K05.62NCC63&

R934001227 OD1506181DS2OC-VEI8A2A06S.18K06.1DNAC21&

R934001235 OD1532171DS2OC-VEI8A2T09.S17K32.1DNAC22&

R934003057 OD1502171AS002-VEI8A2A09.17K02.1ANAC220&

R934003063 OD1503183AS800-VEI8A2B.06M18K03.3ANCC21&

R934003080 OD1505183AS800 VEI8A2A06.M18K05.3ANCC21&

R934003082 OD1505183DS800-VEI8A2A06M18K05.3DNCC218&

R934003105 OD1506761AS000-VEI8A2A09.76K06.1ANAC220&

R934003110 OD1511193AS800-VEI8A2A06.U19K11.3ANCC21&

R934003111 OD1531173DS800-VEI8A2T09.M17K31.3DNCC22&

R934003114 OD1531183DS801-VEI8A2T06.M18K31.3DNCC21&

R934003122 OD***请点击商铺导航 联系我们***0-VEI7A2T14.21K32.54NAL630&

R934003423 OD15053698OC00-VEI8A2A09.36K05.98NCAX18&

R934003424 OD150617180 VEI8A2A09.17K06.18NAC218SEX3

R934003434 OD***请点击商铺导航 联系我们***0 VEI8A2A06M18K05.37NCC218S

R934003486 OD1507183MS000 VEI8I2A06.F18K07.3MNCC21&

R934003758 OD***请点击商铺导航 联系我们***0-VEI7A2A14.21K05.76NCL630&

R934003884 OD***请点击商铺导航 联系我们***0 VEI8I2A06.18K05.31NCC218&

R934003885 OD***请点击商铺导航 联系我们***0-VEI8I2A06.18K06.20NAC218&

R934004160 OD1511213DS000-VEI8A2A12.U21K11.3DNCC22&

R934004319 OD1505184105OC-VESP-08A-12A/00-2A05-N7

R934004320 OD1505184185OC-VESP-08A-12A/00-2A85-N7-&

R934004378 OD1505184185OZ-VESP-08A-12A/00-2A05-N7

R934004411 OD1531363AS001-VEI8A2T09.V36K31.3ANCC22&

R934004493 OD1505893AS001-VEI8A2A12.V89K05.3ANCC22&

R934004542 OD1532181DS2OB-VESP-08A-12A/00-2T32-N7

R934004627 OD1505216504OC-VESP-16G-16A/00-2A01-N7

R934004628 OD1505216584OC-VESP-16G-16A/00-2A-N7

R934004630 OD1505216584OB-VESP-16G-16A/00-2A05-N7

R934004674 OD1505176504OC-VESP-12G-16A/00-2A05-N7

R934004675 OD1505176504OB-VESP-12G-16A/00-2A05-N7

R934004749 OD1531176501OC-VESP-12G-12A/00-2T31-N7

R934004812 OD1505184106OC-VESP-08A-12A/00-2A05-N7

R934004878 OD1503363DS000-VEI8A2B09.36K03.3DNCC222&

R934004903 OD1532181DS2OC-VESP-08A-12A/00-2T32-N7

R934005046 OD1531173DS100-VEI8A2T09.17K31.3DNCC222&

R934005243 OD1506182DS2OC-VEI8A2A06S18K06.1DNAC218&

R978023991 OD***请点击商铺导航 联系我们***0 VEI8I2A06.18K01.32NCC218S

R978023992 OD***请点击商铺导航 联系我们***0 SZ8 NC 1-2 BI S8

R978023994 OD***请点击商铺导航 联系我们***0 SZ8 NO 1-2 BI S8

R978023996 OD***请点击商铺导航 联系我们***0 SZ8 NC 2-1 BI S8 LF

R978023997 OD***请点击商铺导航 联系我们***0 VEI8I2A06.18K05.32NCC218S

R978023999 OD***请点击商铺导航 联系我们***0 SZ8 NO 2-1 BI S8 MO

R978024000 OD***请点击商铺导航 联系我们***0 SZ8 NO 2-1 BI S8 LF

R978024003 OD***请点击商铺导航 联系我们***0 SZ8 NC 1 2 BI S8 LF

R978024004 OD***请点击商铺导航 联系我们***0 SZ8 NC 1 2 BI S8 MO

R978024007 OD***请点击商铺导航 联系我们***0 SZ8 NO 1 2 BI S8 MO

R978024011 OD***请点击商铺导航 联系我们***0 VEI8A2B16.04K04.17NAC218S

R978024012 OD***请点击商铺导航 联系我们***0 VEI-8A-2B-16-NA

R978024019 OD***请点击商铺导航 联系我们***0 VEI8A2A12.21K05.37NCC226S

R978024024 OD***请点击商铺导航 联系我们***0 VEI8A2A12.21K06.17NAC226S

R978034034 OD1531893AS0 VITON VEI-8A-2T

R987019976 TUBO D15 B. ACUM B.VALV.750KW RE-4-0

R987067733 OD1502211AS000-VEI8A2A12.21K02.1ANAC225&

R987125752 VEI-8A-2T-12-NC-S - OD 15-3121-3BS000

R987172056 VALVE OD1531213700 &

R987195006 VEI-8A-2T-06-NA-S OD15.32.18-17-00

R987198232 VALVE OD1532211AS0 &

R987201460 OD1532171CS0000 VEI-8A-2T-09-NA-S-NSS

R987231423 OD1531173BS0

R987231763 OD1531173AS001

R987233190 OD1505183AS000

R987256974 OD1503173BSO

R987269778 VALVE OD1531183AS000 &

R987280171 VALVE OD1506171AS000 &

R987321208 OD1505176205OC

R987331918 OD15061818/OD02170130AC HMF

R987349614 VEI-EX OD15313698OC

R987361622 VALVE OD1506181CS200-S01

R987362042 SOLENOID-OPERATED OD1531823CS800

R987363900 SCREW-IN CAR.VALVE OD1506181AS000-S02

R987365139 SCREW-IN CAR.VALVE OD15061818/12VDC SPOL

R987365760 VALVE OD1505183AS000-S01 &

R987365972 SCREW-IN CAR.VALVE OD1505173AS0000

R987365973 SCREW-IN CAR.VALVE OD***请点击商铺导航 联系我们***00

R987365974 SCREW-IN CAR.VALVE OD1505183IS0000

R987365975 SCREW-IN CAR.VALVE OD150518AS80000

R987365976 SCREW-IN CAR.VALVE OD***请点击商铺导航 联系我们***0

R987365977 SCREW-IN CAR.VALVE OD1505363ASO000

R987365978 SCREW-IN CAR.VALVE OD1506181ASO000

R987365979 SCREW-IN CAR.VALVE OD1506181IS0000

R987365980 SCREW-IN CAR.VALVE OD1506361AS0000

R987365981 SCREW-IN CAR.VALVE OD1506361ASO000

R987365982 SCREW-IN CAR.VALVE OD***请点击商铺导航 联系我们***0

R987365983 SCREW-IN CAR.VALVE OD1531183ASO000

R987365984 SCREW-IN CAR.VALVE OD1531753BS0000

R987365985 SCREW-IN CAR.VALVE OD1532181AS0000

R987365986 SCREW-IN CAR.VALVE OD1532181ASO000

R987365987 SCREW-IN CAR.VALVE OD1532211AS0000

R987366100 SPECIAL VALVE OD1506181AS0000

R987369760 VALVE OD1506171AS001-S01

R987386722 VALVE OD1531183DS801-S01

R987389264 VEI-8A-2T-10A-NC-S-NSS, N0 OD1531363AS00

R987391038 VEI8A2A09.17K06.17NAC218SXX3 OD15061717

R987391040 OD1504891BS0000 VEI-8A-2B-12A-NA-S-NSS,N

R987391041 OD1503893DS000 VEI-8A-2B-12A-NC-S-NSS, N

R988002282 OD1505183AS0000 VEI8A2A06.18K05.3AN -

力士乐REXROTH行走机械液压-紧凑型液压系统-插装阀-机械插装阀-螺纹插装阀-节流阀

R901208447 OD21010304-VSTXX09-17X03

R934001238 OD21010305-VSTXX12-21X03

R901109830 OD210103360000-VSTXX09-36X03

R901109366 OD21010356-VSTXX06-18X03

R988002556 OD21010356000 ST-C-06

R901109837 OD210103750000-VSTXX12-75X03

R901109832 OD210103890000-VSTXX12-89X03

R930072460 OD210103890V00-VSTXX12-89X03-V

R901088720 OD21010404-VSTXX09-17X04

R901128469 OD21010405-VSTXX12-21X04

R901109831 OD210104360000-VSTXX09-36X04

R901109367 OD21010456-VSTXX06-18X04

R901109838 OD210104750000-VSTXX12-75X04

R901109834 OD210104890000-VSTXX12-89X04

R930056068 OD21010556-VSTXX06CA.18X04

R934001254 OD210418030000-VSTUX06-18X03

R934001255 OD210418040000 VSTUX06CA.18X04

R934001256 OD210518030000-VSTUX03-18X03

R934001258 OD210618030000-VSTUX04-18X03

变量泵-变量马达调速系统的特性分析

其系统原理。当系统启动或低速时，马达保持大排量,调速由变量泵完成，通过系统压力来改变马达输出转矩，可获得较大的启动转矩;高速时，泵保持大排量不变，调速由变量马达完成，为恒功率调速，能适应负载的波动，充分利用发动机功率。这种调速回路可以适应大部分机械的负载要求，应用广泛。

 

在变量泵一变量马达调速系统中,泵的变量方式通常都有手动和自动两种

控制方式:。

系统压力210bar、泵和马达全排量时，泵的效率与输入转速的关系曲线。分析可得:当转速小于100rpm时,由于柱塞工作循环时间长，泄漏量大,加之补油泵吸油能力差,泵的容积效率较低。当转速为1000 2000rpm时,由于补油充分且泄漏减小，容积效率随转速增加而平稳上升并终保持某一高值。但当接近额定转速时，容积效率稍有下降。原因是泵内泄漏量的较好值主要取决于压力，随转速增加得不多，而泵的输出流量在一-定范围内却几乎正比于转速，泄漏量相对于输出流量的比值随转速增加而下降，因此容积效率升高。但是转速过高时，吸油阻力剧增，液压油内所含气体的析出会使实际进入柱塞缸的油量减少，会导致容积效率又趋于下降。

对于机械效率而言，排量、压力一定时，泵的有效输入转矩并不随转速变化，而构成泵轴阻力矩的油液流动损失、运动副间的摩擦损失和各旋转部件的搅油损失等在泵的工况范围内却都是随转速增加而增加，所以转速越高，泵的机械效率越低。

 

转逮对泵效率的影响

全排量且转速恒定时，随工作压力的增高，由于各密封面间泄漏量的增加,泵的容积效率下降。

系统压力越高，输入转矩中用于克服泵内零件自身运动阻力的部分所占比重就越小，因此泵的机械效率在相当大程度上随压力的增加而上升，压力为280bar左右时，机械效率达95%以上。但当压力上升到-定限度后，由于某些运动副零件受力后变形过大，运动阻力剧增，机械效率将会稍有所下降。

据此，由容积效率和机械效率相乘而得的总效率曲线也就必然呈现一种随压力和转速增加先升高后又降低的趋势。

 

排量对泵效率的影响

输入转速2200rpm、系统压力420bar 时,泵的效率与排量的关系曲线。可以看出，排量对机械效率的影响较小，而对容积效率和总效率的影响较大，都呈上升趋势。

 

泵全排量时的效率特性

分析可知，在中速、中低压附近，泵和马达的总效率都达到大值;在中速范围(0.5np~n)和很宽的压力范围(1/6PH -5/6 PH)内， 泵具有90%以上的总效率值;在0.25nz~nH转速范围及1/6Pu (泵额定压力420bar)以上的全部压力范围内(机器的空驶负荷负荷压力一般高于1/6PH,因此1/6PH 以上的压力范围即为机器工作的全部压力范围)，具有85%以上的总效率，因此只要转速不低于10%nH,泵就具有85%左右的总效率8。

 

马达的效率特性

1.转速对马达效率的影响

系统压力210bar、泵和马达全排量时，马达效率与转速的关系曲线。马达的容积效率同泵一样， 受转速的影响较大。不同的是马达进出油口直接连接泵的出进油口,不存在吸空现象，高转速时容积效率不会下降。机械效率随转速变化呈先增后减的趋势，但影响较弱，变化平稳。

2.压力对马达效率的影响

泵和马达全排量、马达转速1000rpm左右时，系统压力对马达效率的影响。此时，由于系统压力的增加，会导致容积效率较快速下降。机械效率随压力的加大而升高，影响较小。总效率同泵。

3.排量对马达效率的影响

系统压力210bar,马达转速基本不变，排量对马达效率的影响曲线。容积效率、机械效率、总效率呈上升趋势，其中容积效率变化显著。

4.马达全排量时的效率特性

在几乎全部转速和范围内，马达都能保持较高的效率。由于马达是斜轴马达，没有滑靴密封面，在低速时，可以有较高的效率(主要是容积效率)，即使是在0转速时，仍然有74%以上的效率，因此比斜盘马达具有更低的稳定工作转速。这种特性更适合应用于频频换向行走、启动加速的行走机械。

综上所述，泵和马达具有基本相同的效率特性。其中容积效率受外界因素的影响大，任何因素的变化，都可能引起容积效率的较大变化，而机械效率相对比较平稳。因此在分析液压系统效率时，应首先考虑对容积效率的影响。

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减压阀是一种自动降低管路工作压力的专门装置，它可将阀前管路较高的液体压力减少至阀后管路所需的水平。这里的传输介质主要是水。减压阀广泛用于高层建筑、城市给水管网水压过高的区域、矿井及其他场合，以保证给水系统中各用水点获得适当的服务水压和流量。鉴于水的漏失率和浪费程度几乎同给水系统的水压大小成正比，因此减压阀具有改善系统运行工况和潜在节水作用，据统计其节水效果约为30%。