4WRPEH6C3B12L-2X/G24K0/A1M
4WRPEH6C3B12L-2X/G24K0/A1M
产品简介：
阀对流量的控制可以分为两种:
一种是开关控制:要么全开、要么全关，流量要么最大、要么最小，没有中间状态，如普通的电磁直通阀、电磁换向阀、电液换向阀。
另一种是连续控制:阀口可以根据需要打开任意一个开度，由此控制通过流量的大小，这类阀有手动控制的，如节流阀，也有电控的，如比例阀、伺服阀。
力士乐液压部分系列型号：
R902453052 AA10VO28DRG/52R-VSC64N00-S2110
R902549362 AA10VO28DRG/53R-VPC12N00
R902422818 AA10VO28DFLR/52R-VSC12H00*UNGUEL***
R902426903 AA10VO28DFLR/53R-VSC12H00-S1978
R902406949 AA10VO28ED71/52L-PSC62N00P
R902455665 AA10VO28ED71/52R-VRC12K01P
R902455664 AA10VO28ED71/52R-VRC12K68P
R902411249 AA10VO28ED72/5*UNGUEL***0T-S1126
R902416721 AA10VO28ED72/52L-PSC12N00H
R902417233 AA10VO28ED72/52L-PSC12N00T-SO702
R902417288 AA10VO28ED72/52L-PSC61N00T
R902433654 AA10VO28ED72/52L-PSC64N00T
R902455016 AA10VO28ED72/52L-VCC11N00P
R902447229 AA10VO28ED72/52L-VRC12K68P
R902490963 AA10VO28ED72/52L-VRC12N00H
R902453853 AA10VO28ED72/52L-VSC11N00P
R902424683 AA10VO28ED72/52L-VSC11N00P-S1457
R902428367 AA10VO28ED72/52L-VSC12K01T
R902418486 AA10VO28ED72/52L-VSC12N00*UNGUEL***
R902476645 AA10VO28ED72/52L-VSC12N00H
R902447230 AA10VO28ED72/52L-VSC12N00PE
R902428357 AA10VO28ED72/52L-VSC12N00P-SO702
R902411726 AA10VO28ED72/52L-VSC12N00T-S1126
R902455401 AA10VO28ED72/52L-VSC61N00P
R902427115 AA10VO28ED72/52L-VSC62N00H
R902406060 AA10VO28ED72/52L-VSC62N00T
R902429951 AA10VO28ED72/52R-PSC61N00T
R902468960 AA10VO28ED72/52R-VCC11N00P-S1457
R902471040 AA10VO28ED72/52R-VCC11N00P-S2110
R902472130 AA10VO28ED72/52R-VCC12N00P-S1457
R902439471 AA10VO28ED72/52R-VRC12K68P-SO965
R992000791 AA10VO28ED72/52R-VRC12K68P-SO965
R902453687 AA10VO28ED72/52R-VRC12N00H
R902450584 AA10VO28ED72/52R-VRC12N00P
R902450395 AA10VO28ED72/52R-VRC12N00P-SO965
R902501669 AA10VO28ED72/52R-VSC11N00P-S1457
R902513603 AA10VO28ED72/52R-VSC11N00P-S4208
R902531482 AA10VO28ED72/52R-VSC11N00P-S4112
R902497963 AA10VO28ED72/52R-VSC11N00P-S2492
R902444702 AA10VO28ED72/52R-VSC11N00T
R902444053 AA10VO28ED72/52R-VSC12K01P
R902444619 AA10VO28ED72/52R-VSC12K68H
R902443778 AA10VO28ED72/52R-VSC12K68P
R902439955 AA10VO28ED72/52R-VSC12K68P-S1948
R902412395 AA10VO28ED72/52R-VSC12K68T-S1694
R902448190 AA10VO28ED72/52R-VSC12N00HE
R902439956 AA10VO28ED72/52R-VSC12N00P-S1948
R902438153 AA10VO28ED72/52R-VSC12N00P-S2070
R902416798 AA10VO28ED72/52R-VSC12N00T
R902412351 AA10VO28ED72/52R-VSC12N00T-S1126
R902415121 AA10VO28ED72/52R-VSC12N00T-S1318
R902449605 AA10VO28ED72/52R-VSC12N00T-S2084
R902422850 AA10VO28ED72/52R-VSC12N00T-S2377
R902444711 AA10VO28ED72/52R-VSC61N00TE
R902450573 AA10VO28ED72/52R-VSC62K01P
R902439348 AA10VO28ED72/52R-VSC62N00P
R902406663 AA10VO28ED72/52R-VSC64N00P
R902513408 AA10VO28ED72/52R-VTC12K68P-SO200
R902451242 AA10VO28ED72/52R-VTC12N00T
R902463047 AA10VO28ED72/53R-VSC12N00P-SO97
R902420142 AA10VO28ED73/52L-VSC11N00P
R902465637 AA10VO28ED73/52L-VSC11N00P-S2492
R902454332 AA10VO28ED73/52L-VSC11N00T
R902420282 AA10VO28ED73/52L-VSC11N00T-SO262
R902423974 AA10VO28ED73/52R-PSC62N00P
R902435629 AA10VO28ED73/52R-PSC62N00PE
R902421597 AA10VO28ED73/52R-PSC62N00T
R902455047 AA10VO28ED73/52R-VSC12N00P
R902452887 AA10VO28ED73/52R-VSC12N00P-S2192
R902423723 AA10VO28ED73/52R-VXXXXN00T*G*-S1520
R902449779 AA10VO28ED74/52R-VSC11N00P-SO925
R902468275 AA10VO28EP1D/53R-VRC12K01P
R902453612 AA10VO28EP1D/53R-VSC12K01P
R902439957 AA10VO28EP2D/53R-VTC12K68*UNGUEL***
R902555794 AA10VO28ER72/52L-VSC12K01P
R902483714 AA10VO28LA6DS/53R-VSC11N00
R902443430 AA10VO28LA6DS/53R-VSC62N00
R902475120 AA10VO28LA7DS/53R-VSC11N00
R902450801 AA10VO28LA7DS/53R-VSC12N00-S2111
R902453962 AA10VO28LA7DS/53R-VSC12N00-S2287
R902455225 AA10VO28LA7DS/53R-VSC62N00-SO928
R902447250 AA10VO28LA8DS/53R-VSC12H00-S2033
R902447507 AA10VO28LA8DS/53R-VSC12H00-S2035
R902449950 AA10VO28LA8DS/53R-VSC62N00-S1902
R902455226 AA10VO28LA8DS/53R-VSC62N00-SO928
R902455458 AA10VO28LA9DS/53R-VSC11N00-S2270
R902406951 AA10VO28LA9DS/53R-VSC62N00-SO928
R902429513 AA10VO28LRDS/53R-VSC12H00*G*-S1605
R902443622 AA10VO28LRDS/53R-VSC12H00*G*-S1605
R902464091 AA10VO32DFR1/52R-VUC11N00-S2504
R910972377 AA10VO45DFR/52L-PCC12N00
R902427894 AA10VO45DFR/52L-PCC12N00-S1530
R902429475 AA10VO45DFR/52L-PCC12N00-SO481
R902400076 AA10VO45DFR/52L-PKC62K04
R910984073 AA10VO45DFR/52L-PKC62N00
R910976281 AA10VO45DFR/52L-PKC64N00
R902401426 AA10VO45DFR/52L-PRC61N00
R902401053 AA10VO45DFR/52L-PRC62K04
R902406546 AA10VO45DFR/52L-PRC62K52
R902401263 AA10VO45DFR/52L-PRC62K68
R910966198 AA10VO45DFR/52L-PSC11N00
R902427153 AA10VO45DFR/52L-PSC11N00-SO547
R910974040 AA10VO45DFR/52L-PSC12N00
R910975255 AA10VO45DFR/52L-PSC61N00
R902401268 AA10VO45DFR/52L-PSC62K01
R902433138 AA10VO45DFR/52L-PSC62K02
R902401086 AA10VO45DFR/52L-PSC62K04
R902416100 AA10VO45DFR/52L-PSC62K04-SO607
R910975256 AA10VO45DFR/52L-PSC62K68
R902403845 AA10VO45DFR/52L-PSC62N00
R902416092 AA10VO45DFR/52L-PSC62N00-SO607
R910972815 AA10VO45DFR/52L-PSC64N00
R910973764 AA10VO45DFR/52L-PUC11N00
R910986466 AA10VO45DFR/52L-PUC12N00
R910975493 AA10VO45DFR/52L-PUC61N00
R902401131 AA10VO45DFR/52L-PUC62K52
R902406537 AA10VO45DFR/52L-PUC62K68
R902400111 AA10VO45DFR/52L-PUC62N00
R910970020 AA10VO45DFR/52L-PUC64N00
R910986457 AA10VO45DFR/52L-PUC64N00-SO547
R902435388 AA10VO45DFR/52L-PUC64N00E
R902437371 AA10VO45DFR/52L-PWC12K01
R902406048 AA10VO45DFR/52L-PWC62K01
R902480136 AA10VO45DFR/52L-VKC11N00
R902453155 AA10VO45DFR/52L-VRC12N00
R902428461 AA10VO45DFR/52L-VSC11N00
R902404331 AA10VO45DFR/52L-VSC12K01-SO547
R902408739 AA10VO45DFR/52L-VSC12KA2
R902484286 AA10VO45DFR/52L-VSC12N00
R902410519 AA10VO45DFR/52L-VSC12N00-S1195
R902453618 AA10VO45DFR/52L-VSC12N00-SO724
R902456051 AA10VO45DFR/52L-VSC12N00E
R902451962 AA10VO45DFR/52L-VSC62N00E
R910983817 AA10VO45DFR/52L-VUC11N00-SO607
R910987608 AA10VO45DFR/52L-VUC11N00-SO746
R902451427 AA10VO45DFR/52L-VUC12N00
R902434888 AA10VO45DFR/52L-VUC12N00-S1195
R902412161 AA10VO45DFR/52L-VUC13N00
R902453952 AA10VO45DFR/52L-VUC13N00-SO481
R902419826 AA10VO45DFR/52L-VWC11N00
R902453066 AA10VO45DFR/52L-VWC12N00
R902428334 AA10VO45DFR/52R-PKC12G60
R902400110 AA10VO45DFR/52R-PKC61N00
R910976282 AA10VO45DFR/52R-PKC64N00
R902542593 AA10VO45DFR/52R-PKC64N00
R902401054 AA10VO45DFR/52R-PKC64N00-SO97
R902406004 AA10VO45DFR/52R-PRC62K04
R902406662 AA10VO45DFR/52R-PRC62K68
R902501010 AA10VO45DFR/52R-PRC62K68-SO854
R910983819 AA10VO45DFR/52R-PSC11N00
R902427151 AA10VO45DFR/52R-PSC11N00-SO547
R902429541 AA10VO45DFR/52R-PSC12G50-SO547
R902432068 AA10VO45DFR/52R-PSC12G77
R902413391 AA10VO45DFR/52R-PSC12K01
R902415030 AA10VO45DFR/52R-PSC12K01-SO97
R902433519 AA10VO45DFR/52R-PSC12K01E
R902418635 AA10VO45DFR/52R-PSC12K04-SO547
R902411138 AA10VO45DFR/52R-PSC12K68
R910986132 AA10VO45DFR/52R-PSC12N00
R910999923 AA10VO45DFR/52R-PSC12N00-SO116
R910997054 AA10VO45DFR/52R-PSC12N00-SO547
R910998531 AA10VO45DFR/52R-PSC12N00-SO779
R910990157 AA10VO45DFR/52R-PSC61N00
R910992754 AA10VO45DFR/52R-PSC61N00-SO547
R902433687 AA10VO45DFR/52R-PSC62K02
R910985638 AA10VO45DFR/52R-PSC62K04
R902400109 AA10VO45DFR/52R-PSC62K68
R902400300 AA10VO45DFR/52R-PSC62N00
R902401252 AA10VO45DFR/52R-PSC62N00-SO97
R902406102 AA10VO45DFR/52R-PSC62N00-SO607
R910970014 AA10VO45DFR/52R-PSC64N00
R910978797 AA10VO45DFR/52R-PUC11N00
R902431634 AA10VO45DFR/52R-PUC12N00-S1137
R910986465 AA10VO45DFR/52R-PUC12N00-SO649
R910992522 AA10VO45DFR/52R-PUC61N00
R902400030 AA10VO45DFR/52R-PUC62K68
R902400003 AA10VO45DFR/52R-PUC62N00
R902401047 AA10VO45DFR/52R-PUC62N00-SO794
R910970025 AA10VO45DFR/52R-PUC64N00
R902534907 AA10VO45DFR/52R-PUC64N00
R902409443 AA10VO45DFR/52R-PUC64N00-S1137
R902402462 AA10VO45DFR/52R-PUC64N00-SO97
R902400042 AA10VO45DFR/52R-PUC64N00-SO481
R902401256 AA10VO45DFR/52R-PUC64N00-SO547
R902401001 AA10VO45DFR/52R-PUC64N00-SO794
R902400204 AA10VO45DFR/52R-PUC64N00-SO854
R902438994 AA10VO45DFR/52R-PUC64N00E
R902450826 AA10VO45DFR/52R-VKC11N00
R902406092 AA10VO45DFR/52R-VKC62K04-SO97
R902406858 AA10VO45DFR/52R-VRC62K04-SO607
R902416305 AA10VO45DFR/52R-VSC11N00
R902454862 AA10VO45DFR/52R-VSC12K01-S2153
R902453350 AA10VO45DFR/52R-VSC12K01-SO547
R902439346 AA10VO45DFR/52R-VSC12K68
R902463659 AA10VO45DFR/52R-VSC12N00
R902404875 AA10VO45DFR/52R-VSC12N00-S1097
R902407534 AA10VO45DFR/52R-VSC12N00-S1133
R902463309 AA10VO45DFR/52R-VSC12N00-S2436
R902437904 AA10VO45DFR/52R-VSC12N00-SO724
R910996343 AA10VO45DFR/52R-VSC12N00-SO905
R902400179 AA10VO45DFR/52R-VSC61N00
R902435955 AA10VO45DFR/52R-VSC62K01
R902400149 AA10VO45DFR/52R-VSC62N00
R902504660 AA10VO45DFR/52R-VSC62N00*GO2*
R902406093 AA10VO45DFR/52R-VSC62N00-SO97
R902401405 AA10VO45DFR/52R-VSC64N00
R910987738 AA10VO45DFR/52R-VUC11N00-SO607
R910987560 AA10VO45DFR/52R-VUC12N00
R902401118 AA10VO45DFR/52R-VUC62N00
R902504662 AA10VO45DFR/52R-VUC62N00*GO2*
R902453415 AA10VO45DFR/52R-VUC64N00-S1137
R902429226 AA10VO45DFR/52R-VUC64N00-S1195
R902418703 AA10VO45DFR/52R-VWC11N00
R902550698 AA10VO45DFR/52R-VWC12K01
R902504663 AA10VO45DFR1/52R-VSC62N00*GO2*
R902433460 AA10VO45DFR1/*UNGUEL***00-S1791
R902539738 AA10VO45DFR1/50R-VWC12N00-SO627
R902417251 AA10VO45DFR1/52L-PCC11N00-S1352
R910986254 AA10VO45DFR1/52L-PCC12N00
R910984153 AA10VO45DFR1/52L-PKC64N00
R902406186 AA10VO45DFR1/52L-PKC64N00-SO381
R910974737 AA10VO45DFR1/52L-PRC12K04-SO407
R910995790 AA10VO45DFR1/52L-PRC12K04-SO702
R902406649 AA10VO45DFR1/52L-PRC61N00
R902427901 AA10VO45DFR1/52L-PRC62G80
R902400475 AA10VO45DFR1/52L-PRC62K04
R910972157 AA10VO45DFR1/52L-PSC11N00
R902415544 AA10VO45DFR1/52L-PSC11N00-S1313
R902429040 AA10VO45DFR1/52L-PSC11N00-S1683
R910974797 AA10VO45DFR1/52L-PSC11N00-SO407
R902407807 AA10VO45DFR1/52L-PSC11N00-SO547
R902411841 AA10VO45DFR1/52L-PSC11N00-SO702
R910985918 AA10VO45DFR1/52L-PSC11N00-SO717
R902414036 AA10VO45DFR1/52L-PSC11N00*UNGUEL***
R902429047 AA10VO45DFR1/52L-PSC12G60
R902444899 AA10VO45DFR1/52L-PSC12L40-SO413
R910979536 AA10VO45DFR1/52L-PSC12N00
R902406942 AA10VO45DFR1/52L-PSC12N00-S1702
R910996192 AA10VO45DFR1/52L-PSC12N00-SO547
R910996596 AA10VO45DFR1/52L-PSC12N00-SO694
R910985405 AA10VO45DFR1/52L-PSC12N00-SO702
R910998015 AA10VO45DFR1/52L-PSC12N00-SO937
R902435318 AA10VO45DFR1/52L-PSC12N00E
R910983571 AA10VO45DFR1/52L-PSC61N00
R902400262 AA10VO45DFR1/52L-PSC62K01
R902428214 AA10VO45DFR1/52L-PSC62K52-S1658
R902406708 AA10VO45DFR1/52L-PSC62K68-SO547
R902437894 AA10VO45DFR1/52L-PSC62N00
R902400341 AA10VO45DFR1/52L-PSC62N00
R902400383 AA10VO45DFR1/52L-PSC62N00*UNGUEL***
R910966170 AA10VO45DFR1/52L-PSC64N00
R910978580 AA10VO45DFR1/52L-PSC64N00-SO97
R902428397 AA10VO45DFR1/52L-PSC64N00-SO547
R910975945 AA10VO45DFR1/52L-PSC64N00-SO614
R902418841 AA10VO45DFR1/52L-PUC11N00-S1352
R902420956 AA10VO45DFR1/52L-PUC11N00-S1447
R902427258 AA10VO45DFR1/52L-PUC11N00-S1625
R910989851 AA10VO45DFR1/52L-PUC11N00-S3726
R902412996 AA10VO45DFR1/52L-PUC12G30
R910971974 AA10VO45DFR1/52L-PUC12N00
R902433396 AA10VO45DFR1/52L-PUC13N00-SO710
R910979954 AA10VO45DFR1/52L-PUC61N00
R902437462 AA10VO45DFR1/52L-PUC61N00E
R902401380 AA10VO45DFR1/52L-PUC62N00
R910970024 AA10VO45DFR1/52L-PUC64N00
R902400002 AA10VO45DFR1/52L-PUC64N00-SO97
R902400172 AA10VO45DFR1/52L-PUC64N00-SO547
R902401057 AA10VO45DFR1/52L-PWC62K01
R902406837 AA10VO45DFR1/52L-VCC11N00-S2172
R902453621 AA10VO45DFR1/52L-VCC11N00-S2208
R910990935 AA10VO45DFR1/52L-VRC12K04-SO804
R902420413 AA10VO45DFR1/52L-VRC62K68
R902406192 AA10VO45DFR1/52L-VRC62K68-ESO973
R902483112 AA10VO45DFR1/52L-VSC11N00
R902416276 AA10VO45DFR1/52L-VSC11N00-S1507
R902443905 AA10VO45DFR1/52L-VSC11N00-S2054
R902454161 AA10VO45DFR1/52L-VSC11N00-S2219
R902411087 AA10VO45DFR1/52L-VSC11N00-SO710
R910990941 AA10VO45DFR1/52L-VSC11N00-SO804
R902433925 AA10VO45DFR1/52L-VSC12H00-S3974
R902413717 AA10VO45DFR1/52L-VSC12K01
R902540397 AA10VO45DFR1/52L-VSC12K01
R902419805 AA10VO45DFR1/52L-VSC12K04
R902425209 AA10VO45DFR1/52L-VSC12K68-S1213
R910975052 AA10VO45DFR1/52L-VSC12K68-S1487
R902447840 AA10VO45DFR1/52L-VSC12K68-S2053
R992000825 AA10VO45DFR1/52L-VSC12K68-S2053
R902403212 AA10VO45DFR1/52L-VSC12K68-SO702
R902455217 AA10VO45DFR1/52L-VSC12K68-SO794
R902414239 AA10VO45DFR1/52L-VSC12KA2
R910988986 AA10VO45DFR1/52L-VSC12N00
R902402502 AA10VO45DFR1/52L-VSC12N00-S1021
R902404200 AA10VO45DFR1/52L-VSC12N00-S1025
R902444617 AA10VO45DFR1/52L-VSC12N00-S1213
R902430084 AA10VO45DFR1/52L-VSC12N00-S1388
R902448308 AA10VO45DFR1/52L-VSC12N00-S2053
R902455549 AA10VO45DFR1/52L-VSC12N00-S2226
R902454667 AA10VO45DFR1/52L-VSC12N00-S2318
R902416921 AA10VO45DFR1/52L-VSC12N00-SO702
R910994554 AA10VO45DFR1/52L-VSC12N00-SO905
R902451551 AA10VO45DFR1/52L-VSCXXH00-S1640
R902550839 AA10VO45DFR1/52L-VUC11N00
R902454059 AA10VO45DFR1/52L-VUC11N00-S1038
R902409974 AA10VO45DFR1/52L-VUC11N00-S1172
R902419986 AA10VO45DFR1/52L-VUC11N00-S1418
R902420955 AA10VO45DFR1/52L-VUC11N00-S1446
R902420958 AA10VO45DFR1/52L-VUC11N00-S1449
所以使用比例阀或伺服阀的目的就是:以电控方式实现对流量的节流控制(当然经过结构上的改动也可实现压力控制等)，既然是节流控制，就必然有能量损失，伺服阀和其它阀不同的是，它的能量损失更大一些，因为它需要一定的流量来维持前置级控制油路的工作。
基本信息
中文名称
比例阀
外文名称
Proportional valve
作用
控制油液的流量和方向
结构
滑阀
目录
1滑阀结构
2区别
3延伸资料
滑阀结构
伺服阀的主阀一般来说和换向阀一样是滑阀结构，只不过阀芯的换向不是靠电磁铁来推动，而是靠前置级阀输出的液压力来推动，这一点和电液换向阀比较相似，只不过电液换向阀的前置级阀是电磁换向阀，而伺服阀的前置级阀是动态特性比较好的喷嘴挡板阀或射流管阀。
也就是说，伺服阀的主阀是靠前置级阀的输出压力来控制的，而前置级阀的压力则来自于伺服阀的入口p，假如p口的压力不足，前置级阀就不能输出足够的压力来推动主阀芯动作。
而我们知道，当负载为零的时候，如果四通滑阀完全打开，p口压力=t口压力+阀口压力损失(忽略油路上的其它压力损失)，如果阀口压力损失很小，t口压力又为零，那么p口的压力就不足以供给前置级阀来推动主阀芯，整个伺服阀就失效了。所以伺服阀的阀口做得偏小，即使在阀口全开的情况下，也要有一定的压力损失，来维持前置级阀的正常工作。
伺服阀其实缺点极多:能耗浪费大、容易出故障、抗污染能力差、价格昂贵等等等等，好处只有一个:动态性能是所有液压阀中最高的。就凭着这一个优点，在很多对动态特性要求高的场合不得不使用伺服阀，如飞机火箭的舵机控制、汽轮机调速等等。动态要求低一点的，基本上都是比例阀的天下了。
一般说来，好像伺服系统都是闭环控制，比例阀多用于开环控制;其次比例阀类型要多，有比例压力、流量控制阀等，控制比伺服要灵活一些。从他们内部结构看，伺服阀多是零遮盖，比例阀则有一定的死区，控制精度要低，响应要慢。但从发展趋势看，特别在比例方向流量控制阀和伺服阀方面，两者性能差别逐渐在缩小，另外比例阀的成本比伺服阀要低许多，抗污染能力也强!
区别
伺服阀与比例阀的区别
伺服阀与比例阀之间的差别并没有严格的规定，因为比例阀的性能越来越好，逐渐向伺服阀靠近，所以近些年出现了比例伺服阀。
比例阀和伺服阀的区别主要体现在以下几点:
1.驱动装置不同。比例阀的驱动装置是比例电磁铁;伺服阀的驱动装置是力马达或力矩马达;
2.性能参数不同。滞环、中位死区、频宽、过滤精度等特性不同，因此应用场合不同，伺服阀和伺服比例阀主要应用在闭环控制系统，其它结构的比例阀主要应用在开环控系统及闭环速度控制系统;
2.1 伺服阀中位没有死区，比例阀有中位死区;
2.2 伺服阀的频响(响应频率)更高，可以高达200Hz左右，比例阀一般最高几十Hz;
2.3 伺服阀对液压油液的要求更高，需要经过滤才行，否则容易堵塞，比例阀要求低一些;
3.阀芯结构及加工精度不同。比例阀采用阀芯+阀体结构，阀体兼作阀套。伺服阀和伺服比例阀采用阀芯+阀套的结构。
4.中位机能种类不同。比例换向阀具有与普通换向阀相似的中位机能，而伺服阀中位机能只有O型(Rexroth产品的E型)。
5.阀的额定压降不同。
而比例伺服阀性能介于伺服阀和比例阀之间。
比例换向阀属于比例阀的一种，用来控制流量和流向。
延伸资料
---电气比例阀
自动控制可分成断续控制和连续控制。断续控制即开关控制。气动控制系统中使用动作频率较低的开关式(ON-OFF)的换向阀来控制气路的通断。靠减压阀来调节所需要的压力，靠节流阀来调节所需要的流量。这种传统的气动控制系统要想要有多个输出力和多个运动速度，就需要多个减压阀、节流阀及换向阀。这样，不仅元件需要多，成本高，构成系统复杂，且许多元件都需要预先进行人工调节。电气比例阀控制属于连续控制，其特点是输出量随输入量的变化而变化，输出量与输入量之间存在一定的比例关系。比例控制有开环控制和闭环控制之分。
结构原理
输入信号增大，供气用电磁阀先导阀1换向，而排气用电磁先导阀7处于复位状态，则供气压力从SUP口通过阀1进入先导室5，先导室压力上升，气压力作用在膜片2的上方，则和膜片2相连的供气阀芯4便开启，排气阀芯3关闭，产生输出压力。此输出压力通过压力传感器6反馈至控制回路8。在这里，与目标值进行快速比较修正，知道输出压力与输入信号成一定比例为止，从而得到输出压力与输入信号的变化成比例的变化。由于没有喷嘴挡板机构，故阀对杂质不敏感，可靠性高。
特点
1)可实现压力、速度的无极调节，避免了常通的开关式气阀换向时的冲击现象。
2)能实现远程控制和程序控制。
3)与断续控制相比，系统简化，元件大大减少。
4)与液压比例阀相比，体积小、重量轻、结构简单、成本较低，但响应速度比液压系统慢得多，对负载变化也比较敏感。
5)使用功率小、发热少、噪声低。
6)不会发生火灾，不污染环境。受温度变化的影响小。
公司简介：
武汉百士自动化设备有限公司位于武汉洪山区，是一家从事经营自动化仪表备件、液压泵阀的贸易型公司；专注于中国工业传动自动化流体领域。主营产品数控模块、伺服电机、可编程控制器、传感器、气动元件、工业仪器仪表、电磁阀、柱塞泵、液压元件等。经营品牌有：贝加莱B&R、西门子Siemens、本特利bently、爱尔泰克Airtec气动、安沃驰Aventics、博世力士乐rexroth、阿托斯ATOS、迪普马DUPLOMATIC、Parker派克、伊顿EATON VICKERS等品牌。
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