比例方向 4WREE6E1-16阀

  型号4WRE 和 4WREE

力士乐Rexroth比例方向阀，直动式，有电位置反馈

规格6和10

安装面按ISO 4401

控制流量的方向和大小

比例电磁铁操作

对中弹簧控制阀芯

不同阀芯可遮盖

集成控制电气元件（OBE）用于4WREE型

R961004665 REGULATOR4WREE6-22/A1*BG力士乐Rexroth

R961003549 GERAETESATZDW40E-D.W4WREE6.-2X

R901161258 4WREE6E32-2X/G24K31/A1V-204

R901073856 HOUSING4WREE10.-22/

R901028415 4WREE10R3-75-2X/G24K31/A1V力士乐Rexroth

比例换向阀    

4WRE 10 E1-25-2X/G24K4/V    

材料号： R900726605 

产品类型   4WRE   2 位 4 通和 3 位 4 通比例换向阀，
直动式，带电子位置反馈 

控制电子元件     不带内装式控制电子元件 

通径   10   通径 10 接口位置，按 ISO 4401,编码: 4401-05-04-0-94

阀芯   E1-   对称的阀芯重叠 带流量比例 2:1 (A:B) 

流量   25   25 L/min, 阀压力降 = 10 bar 

系列   2X   系列 20 至 29 

电压   G24   供电电压 24V DC 

特殊保护型式     不带特殊保护型式 

电子接口   K4   元件插头，按 DIN EN 175301-803,不带电缆插座 (单独订货) 

密封   V   FKM 密封，适用于矿物油 (HL, HLP)按 DIN 51 524, 其它的液体请询问。 

电子元件  

欧洲格式的模拟放大器    R900979888  VT-VRPA2-2-1X/V0/T5   

                        R900979889  VT-VRPA2-2-1X/V0/T1   

欧洲格式的数字放大器    R901066987  VT-VRPD-2-2X/V0/0-0-1   

模块式放大器            R900249811  VT-MRPA2-2-1X/V0/0 

R900625643 DECKEL4WRE10.A-12/

R900624754 GEHAEUSE4WRE10.-14/GGG40

R900617766 4WREE6WA16-2X/G24K31/F1V

R900617482 4WREE6E1-16-2X/G24K31/F1V力士乐Rexroth

R900617269 4WREE10V75-2X/G24K31/F1V

R900617253 4WREEM6E32J-2X/G24K34/B6V-687

R900582331 4WRE10E16-1X/24K4/M

R900576935 4WRE10E32-1X/24K4/M-402力士乐Rexroth

R900551280 4WRE6W1-08-1X/24K4/M

R900549113 4WRE10E1-32-1X/24K4/M

R900540589 KOLBEN4WRE6W1-16-1X/BG

R900499564 4WRE6W32-1X/24K4/M力士乐Rexroth

R900487026 4WRE6W32-1X/24Z4/M

R900461236 4WRE10W1-16-1X/24K4/M

R901136691 4WREQ6Q5-08-2X/V5C-24PF60

R901135153 4WREE6V08-2X=G24K31/F1V-876力士乐Rexroth

R901135118 4WREE10W75-2X/G24K31/A1V-280

R901132085 4WREQ6Q5-32-2X/V4A-24PF60

R901131081 4WREQ6V08-2X/V8F-24CA60

R901131077 4WREQ10V25-2X/V8F-24CA60力士乐Rexroth

R901130450 4WREE10W1-75-2X/G24K31/A1V-660

R901130447 4WREE6E16-2X/G24K31/A1V-660

R901127151 4WREE10W25-2X/G24K31/A1V-280

R901126284 4WREE10E50-2X/G24K31/A1V-280力士乐Rexroth

R901125908 4WREF6E32-2X/V-24PA1

R901125120 4WREE6V08-2X/G24K31/A1V-742

R901120444 4WREE10V1-75-2X/G24K31/A0V-907

R901116919 4WREE6Q5-32-2X/G24K31/A1V=DE力士乐Rexroth

R901113546 4WREE10Q00-2X/G24K31/A1V-598=DE

R901113540 4WREE6Q00-2X/G24K31/A1V-598=DE

R901113345 4WREE10Q5-50-2X/G24K31/A1V=DE

R901112728 4WREE10E25-2X/G24K31/A1V-280力士乐Rexroth

R901109650 4WREE6V32-2X/G24K31/F1V-876

R901107901 4WREE6V16-2X=G24K31/F1V-876

R901105844 KOLBEN4WREQ6Q2-08-20/

R901105842 KOLBEN4WREQ6Q2-32-20/力士乐Rexroth

R901104507 4WREE10W75-2X/G24K31/F1V-742

R901103862 SCHEIBE9,6X1,04WREQ6...-2X/

R901103279 4WREQ6Q5-08-2X/V4C-24CA60

R901102113 4WREQ6V16-2X/V5F-24CF60力士乐Rexroth

R901102112 4WREQ6Q5-16-2X/V5F-24CF60

R901100120 4WREE10E75-2X/G24K31/A1V-660

R901100118 4WREE10W1-50-2X/G24K31/A1V-660

R901095159 4WREE6Q00-2X/G24K31/A1V-598力士乐Rexroth

R901091639 4WREE6V16-2X/G24K31/F1V-876

R901090746 4WREEM10E1-75-2X/G24K34/B6V

R901089537 4WREQ6Q5-16-2X/V8C-24PA60

R901086329 4WRE10WA50-2X/G24K4/V力士乐Rexroth

R901085278 4WREE6V32-2X/G24K31/A1V-742

R901084068 4WREEM10R3-75-2X/G24K34/B6V

R901083525 4WREQ6Q5-16-2X=V8C-24CF60

R901083029 4WREEM10W1-75-2X/G24K34/B6V力士乐Rexroth

R901083027 KOLBEN4WRE6X32-20/-874

R901081738 4WREQ6Q5-08-2X/V4C-24PA60

R901080574 4WREQ6V32-2X/V4C-24CA60

R901078764 4WREF6W32-2X/V-24CA1力士乐Rexroth

R901078404 4WREQ6Q5-32-2X/VBF-24CA60

R901078403 4WREQ6Q5-16-2X/VBF-24CA60

R901078402 4WREQ6Q5-08-2X/VBF-24CA60

R901078399 4WREQ6Q5-08-2X/V8F-24CA60力士乐Rexroth

R901077950 4WREQ6Q5-16-2X/V00-24CF69

R901077667 4WREQ6Q5-16-2X/V00-24CA69

R901076729 4WREE6V32-2X=G24K31/A1V-826

R901075515 4WRE6W32-1X/24K4/M-298力士乐Rexroth

R901073861 GEHAEUSE4WRE10.-21/

R901073856 GEHAEUSE4WREE10.-22/

R901072924 4WREQ6Q5-16-2X/V8C-24CF60

比例换向阀    

4WREE 6 E08-2X/G24K31/A1V    

材料号： R900912156 

产品类型   4WRE   2 位 4 通和 3 位 4 通比例换向阀，
直动式，带电子位置反馈 

控制电子元件   E   带内装式控制电子元件 

通径   6   通径 6  油口位置按 ISO 4401,编码: 4401-03-02-0-94 

阀芯   E   对称式阀芯重叠 

流量   08   8 L/min, 阀压力降 = 10 bar 

系列   2X   系列 20 至 29 

电压   G24   供电电压 24V DC 

特殊保护型式     不带特殊保护型式 

电子接口   K31   元件插头，按 DIN EN 175201-804,不带电缆插座 (单独订货) 

给定值输入   A1   给定值 +/- 10 V 

密封   V   FKM 密封，适用于矿物油 (HL, HLP)按 DIN 51 524, 其它的液体请询问。

R901071989 4WREE10V75-2X=G24K31/A1V-826力士乐Rexroth

R901071988 4WREE10V50-2X=G24K31/A1V-826

R901071987 4WREE6V16-2X=G24K31/A1V-826

R901071985 4WREE6V08-2X=G24K31/A1V-826

R901071941 4WRE10E3-75-2X/G24K4/V-660力士乐Rexroth

R901068955 4WREE6V16-2X/G24K31/A1V-826

R901066667 4WREE10E1-25-2X/G24K31/F1V

R901066046 4WREE10Q5-50-2X/G24K31/A1V

R901063517 4WREF10E3-50-2X/V-24CA1力士乐Rexroth

R901063172 4WREE6EB08-2X/G24K31/F1V

R901063131 4WREE10WA50-2X/G24K31/F1V

R901060222 4WREE10V75-2X/G24K31/A1V-826

R901059709 4WREQ6Q5-32-2X/V8C-24CA60力士乐Rexroth

R901060996 4WREE10WA25-2X/G24K31/F1V

R901057547 4WREQ10Q5-75-2X/VBF-24CA60

R901055176 STW0240-1X/4WREA6V08-2X/V-24CF62

R901054635 4WREQ10Q5-75-2X/V8F-24CA60力士乐Rexroth

R901054633 4WREQ10Q5-50-2X/V8F-24CA60

R901054628 4WREQ10Q5-25-2X/V8F-24CA60

R901054625 4WREQ6Q5-32-2X/V8F-24CA60

R901054623 4WREQ6Q5-16-2X/V8F-24CA60力士乐Rexroth

R901054621 4WREQ6Q5-16-2X/V5F-24CA60

R901054620 4WREQ6Q5-08-2X/V5F-24CA60

R901054619 4WREQ6Q5-16-2X/V8C-24CA60

R901054220 4WREQ6V32-2X/V5C-24CF60力士乐Rexroth

R901050212 FEDERTELLER4WRE6.-2X/...-822

R901048036 4WRE10E3-75-2X/G24K4/V

R901046128 4WREE6V32-2X/G24K31/A1V-826

R901037664 4WREEM6W1-32-2X/G24K34/B6V力士乐Rexroth

R901037662 4WREEM6E1-32-2X/G24K34/B6V

R901037424 4WREE10R75-2X/G24K31/A1V

R901036556 4WRE6V16-2X/G24K4/V-822

R901036403 4WREEM10E50J-2X/G24K34/B6V-735

R901032028 4WRE6V08-2X/G24K4/V-822力士乐Rexroth

R901031274 4WRE6E04-2X/G24K4/V

R901030897 4WRE10WA75-2X/G24K4/V

R901030889 4WREEM10W1-50-2X/G24K34/B6V力士乐Rexroth

R901028415 4WREE10R3-75-2X/G24K31/A1V

R901026320 4WRE10E50-2X/G24K4/V-93

R901026647 4WREE10V75-2X/G24K31/A1V-821

R901024870 4WREE10V1-75-2X/G24K31/F1V力士乐Rexroth

R901022504 GEHAEUSE4WREE6.-20/REGL-BUS/MET-FAS

R901017446 4WRE10V1-50-2X/G24K4/V

R901015837 4WRE10E25-2X/G24K4/V-93

R901011624 4WRE6WA32-2X/G24K4/V力士乐Rexroth

R901008711 4WREE10W25-2X/G24K31/A1V-742

R901008709 4WREE10E25-2X/G24K31/A1V-742

R901008707 4WREEM10W75-2X/G24K34/B6V

R901007660 4WREE10R75-2X/G24K31/F1V-741力士乐Rexroth

R901005786 4WREEM6W32-2X/G24K34/B6V

R901002587 4WREE10WA75-2X/G24K31/A1V

R900979114 4WRE6E00-1X/24K4/M-119

R900978573 4WRE10E1-64-1X/24K4/M-264力士乐Rexroth

R900978168 4WREE6E04-2X/G24K31/F1V

R9009760811 4WREE6E1-08-2X/G24K31/F1V

R900976334 4WREE10V1-25-2X/G24K31/F1V

R900976331 4WREE6V04-2X/G24K31/F1V力士乐Rexroth

R900976330 4WREE10EA75-2X/G24K31/F1V

R900976119 4WREE10W1-75-2X/G24K31/F1V

R900975077 4WREEM6E08J-2X/G24K34/B6V-687

R900975075 4WREEM6E16J-2X/G24K34/B6V-687力士乐Rexroth

R900975074 4WREEM10E50J-2X/G24K34/B6V-687

R900974914 4WREE6E32-2X/G24K31/A1V-280

R900974247 4WREE6WA16-2X/G24K31/A1V

R900974228 4WREE6E08-2X/G24K31/A1V-280力士乐Rexroth

R900974227 4WREE10W50-2X/G24K31/A1V-280

R900974152 4WRE10W1-25-2X/G24K4/V

R900973482 4WREE6WA08-2X/G24K31/A1V

R900973289 4WREE6EA16-2X/G24K31/F1V力士乐Rexroth

R900971420 4WREE10EA50-2X/G24K31/F1V

R900970875 4WRE6E32-1X/24K4/M-254

R900970194 4WRE10E2-32-1X/24K4/M

R900970089 4WREE10E1-75-2X/G24K31/F1V力士乐Rexroth

R900969501 4WREE10W75-2X/G24K31/A1V=DE

R900969483 4WREE6W32-2X/G24K31/A1V=DE

R900969351 4WRE10EA75-2X/G24K4/V

R900969321 4WREE10W3-75-2X/G24K31/A1V

R900968149 4WRE6E1-08-2X/G24K4/V力士乐Rexroth

R900967790 4WREE10EA25-2X/G24K31/A1V

R900967564 4WREE6W04-2X/G24K31/F1V

R900967483 4WRE6M16-1X/24K4/M

R900967470 4WRE10E32-1X/24K4/M-120力士乐Rexroth

R900966805 4WRE6V1-16-2X/G24K4/V

R900965753 4WRE10EA16-1X/24K4/M-120

R900965507 4WRE10EA64-1X/24K4/M-468

R900965492 4WRE10WA64-1X/24K4/V力士乐Rexroth

R900965434 4WRE6WA16-2X/G24K4/V

R900965197 4WRE10WA16-1X/24K4/M

R900965185 4WREE10W1-50-2X/G24K31/F1V

R900965071 4WREE6W1-08-2X/G24K31/F1V力士乐Rexroth

R900964934 4WREE6WA32-2X/G24K31/F1V

R900964078 4WREE6EB32-2X/G24K31/F1V

R900963884 4WRE10E1-16-1X/24K4/M

R900963483 4WREE10WA75-2X/G24K31/F1V力士乐Rexroth

R900962497 4WRE10E2-64-1X/24K4/M

R900962405 4WREE10W1-25-2X/G24K31/F1V

R900962181 4WREE6E32-2X/G24K31/A1V-655

R900961534 4WRE6V1-08-1X/24K4/M力士乐Rexroth

R900961301 4WRE10EA32-1X/24K4/M-120

R900961125 4WRE6WA08-1X/24K4/M

R900960668 4WRE6E1-08-1X/24K4/M

R900960226 4WRE6W00-1X/24K4/M-119力士乐Rexroth

R900960160 4WRE6WA16-1X/24K4/M-303

R900959689 4WRE6W3-32-1X/24K4/M

R900958851 4WRE10EA64-1X/24K4/M-193

R900958777 4WRE6W00-1X/24K4/M-268力士乐Rexroth

R900958157 4WREE10E1-25-2X/G24K31/A1V

R900957259 4WREE10E50-2X/G24K31/A1V-655

R900956574 4WREE10E25-2X/G24K31/F1V

R900956470 4WRE10EA64-1X/24K4/V力士乐Rexroth

R900956458 4WREE10W1-25-2X/G24K31/A1V

R900955406 4WRE10W64-1X/24K4/V

R900955393 4WRE10WA64-1X/24K4/M

R900954117 4WRE10V75-2X/G24K4/V力士乐Rexroth

R900954116 4WRE10V50-2X/G24K4/V

R900954115 4WRE10V25-2X/G24K4/V

R900954114 4WRE10W1-75-2X/G24K4/V

R900954113 4WRE10W1-50-2X/G24K4/V力士乐Rexroth

R900954107 4WRE10W75-2X/G24K4/V

R900954106 4WRE10W50-2X/G24K4/V

R900954105 4WRE10W25-2X/G24K4/V

R900954104 4WRE10E1-75-2X/G24K4/V力士乐Rexroth

R900954103 4WRE10E1-50-2X/G24K4/V

R900954102 4WRE10E75-2X/G24K4/V

R900954101 4WRE10E50-2X/G24K4/V

R900954100 4WRE10E25-2X/G24K4/V力士乐Rexroth

R900954099 4WRE6V32-2X/G24K4/V

R900954098 4WRE6V16-2X/G24K4/V

R900954097 4WRE6V08-2X/G24K4/V

R900954096 4WRE6W1-32-2X/G24K4/V力士乐Rexroth

R900954095 4WRE6W1-16-2X/G24K4/V

R900954094 4WRE6E1-32-2X/G24K4/V

R900954093 4WRE6E1-16-2X/G24K4/V

R900954092 4WRE6E16-2X/G24K4/V力士乐Rexroth

R900953729 4WRE6W1-08-2X/G24K4/V

R900953102 4WREE10W25-2X/G24K31/F1V

R900953026 4WRE6W1-08-1X/24K4/V

R900953025 4WRE10E2-64-1X/24K4/M-402力士乐Rexroth

R900952239 4WREE10E75-2X/G24K31/A1V-655

R900951018 4WRE10EA32-1X/24K4/M

R900950902 4WREE10V1-75-2X/G24K31/A1V

R900950416 4WREE6W16-2X/G24K31/F1V力士乐Rexroth

R900950365 4WREE10V1-25-2X/G24K31/A1V

R900950342 4WREE6E16-2X/G24K31/A1V-655

R900950341 4WREE6E08-2X/G24K31/A1V-655

R900950317 4WREE6EA08-2X/G24K31/A1V力士乐Rexroth

R900949899 4WREE6V1-16-2X/G24K31/F1V

R900949863 4WREE6V1-08-2X/G24K31/F1V

R900949806 4WREE10W50-2X/G24K31/F1V

R900949708 4WRE10W00-1X/24K4/M-174力士乐Rexroth

R900949222 4WREE6E1-32-2X/G24K31/F1V

R900949106 4WRE10W00-1X/24K4/M-173

R900948412 4WREE6X00-2X/G24K31/F1V-652

R900948360 4WREE10W75-2X/G24K31/F1V力士乐Rexroth

R900947990 4WRE10W2-32-1X/24K4/M

R900947410 4WRE6E16-1X/24K4/V

R900947314 4WRE10W64-1X/24K4/M-646

R900947313 4WRE10E64-1X/24K4/M-646力士乐Rexroth

R900947277 4WRE6W1-16-1X/24K4/V

R900946397 4WRE6E00-1X/24K4/M-165

R900945615 4WRE6EA16-1X/24K4/M

R900944924 4WRE6V00-1X/24K4/M-165

R900944121 4WRE6W16-2X/G24K4/V力士乐Rexroth

R900943804 4WREE10V1-50-2X/G24K31/A1V

R900943381 4WRE10W2-64-1X/24K4/M

R900943348 4WRE6W16-1X/24K4/V

R900943272 4WRE10EA64-1X/24K4/M-120力士乐Rexroth

R900943094 4WREE10E50-2X/G24K31/F1V

R900942574 4WRE10E64-1X/24K4/M-402

R900942153 4WRE10E16-1X/24K4/V

R900941623 4WREE6E16-2X/G24K31/F1V力士乐Rexroth

R900941264 4WRE6W08-2X/G24K4/V

R900940561 4WREE6V16-2X/G24K31/F1V

R900940191 4WREE10EA75-2X/G24K31/A1V

R900939866 4WREE10EA50-2X/G24K31/A1V力士乐Rexroth

R900939627 4WREE6W1-16-2X/G24K31/A1V

R900938420 4WREE6E04-2X/G24K31/A1V

R900937147 4WREE6EA08-2X/G24K31/F1V

R900937065 4WREE6W1-16-2X/G24K31/F1V力士乐Rexroth

R900936357 4WREE6V04-2X/G24K31/A1V

R900935426 4WREE6V1-08-2X/G24K31/A1V

R900934746 4WRE10W3-32-1X/24K4/M

R900934607 4WRE10E3-64-1X/24K4/M

R900934365 4WRE10E32-1X/24K4/V力士乐Rexroth

R900933794 4WREE6E1-08-2X/G24K31/A1V

R900933480 4WRE6W32-2X/G24K4/V

R900933478 4WRE6E08-2X/G24K4/V

R900933476 4WREE6W1-32-2X/G24K31/F1V力士乐Rexroth

R900933474 4WRE10W1-64-1X/24K4/V

R900933473 4WRE10E64-1X/24K4/V

R900933077 4WREE10W1-50-2X/G24K31/A1V

R900933076 4WREE10E1-50-2X/G24K31/A1V力士乐Rexroth

R900933075 4WREE10V25-2X/G24K31/A1V

R900933074 4WREE10W25-2X/G24K31/A1V

R900933073 4WREE10E25-2X/G24K31/A1V

R900933044 4WRE6W1-32-1X/24K4/V力士乐Rexroth

R900932498 4WREE6EB32-2X/G24K31/A1V

R900931371 4WREE10W50-2X/G24K31/A1V

R900931195 4WREE6V1-16-2X/G24K31/A1V

R900930845 4WRE6W1-16-1X/24K4/M力士乐Rexroth

R900930498 4WRE6V32-1X/24K4/M

R900929889 4WREE6EA32-2X/G24K31/F1V

R900929827 4WREE6W1-08-2X/G24K31/A1V

R900929575 4WRE10W3-64-1X/24K4/M力士乐Rexroth

R900929205 4WREE6W2-32-2X/G24K31/A1V

R900928726 4WREE6E08-2X/G24K31/F1V

R900928553 4WREE6E1-32-2X/G24K31/A1V

R900928015 4WRE6E1-32-1X/24K4/M力士乐Rexroth

R900927356 4WREE10E75-2X/G24K31/F1V

R900927236 4WREE10Q2-75-2X/G24K31/A1V

R900927235 4WREE10V50-2X/G24K31/A1V

R900927234 4WREE10W1-75-2X/G24K31/A1V力士乐Rexroth

R900927233 4WREE10W75-2X/G24K31/A1V

R900927232 4WREE10E1-75-2X/G24K31/A1V

R900927231 4WREE10E50-2X/G24K31/A1V

R900927230 4WREE10E75-2X/G24K31/A1V力士乐Rexroth

R900926997 4WREE6WA32-2X/G24K31/A1V

R900926747 4WREE6V32-2X/G24K31/F1V

R900926598 4WRE10X64-1X/24K4/M-492

R900926366 4WRE6E32-2X/G24K4/V力士乐Rexroth

R900925733 4WREE6E32-2X/G24K31/F1V

R900925657 4WREE6W16-2X/G24K31/A1V

R900924975 4WREE10V50-2X/G24K31/F1V

R900924607 4WREE10V75-2X/G24K31/A1V

R900924283 4WREE6W08-2X/G24K31/F1V力士乐Rexroth

R900924066 4WRE10EA64-1X/24K4/M

R900924065 4WRE10W1-32-1X/24K4/M

R900923524 4WRE10EA16-1X/24K4/M

R900923000 4WREE6W08-2X/G24K31/A1V力士乐Rexroth

R900921427 4WREE6V08-2X/G24K31/F1V

R900921005 4WRE10V16-1X/24K4/M

R900920567 4WREE6E16-2X/G24K31/A1V

R900920151 4WRE6W2-32-1X/24K4/M力士乐Rexroth

R900916331 4WRE6WA32-1X/24K4/M

R900916330 4WRE6WA16-1X/24K4/M

R900916329 4WRE6V16-1X/24K4/M

R900916328 4WRE6V08-1X/24K4/M力士乐Rexroth

R900916327 4WRE6EA32-1X/24K4/M

R900916326 4WRE6E1-16-1X/24K4/M

R900916325 4WRE10W16-1X/24K4/M

R900916324 4WRE10W1-64-1X/24K4/M力士乐Rexroth

R900916323 4WRE10V64-1X/24K4/M

R900916322 4WRE10V32-1X/24K4/M

R900916317 4WRE10E1-64-1X/24K4/M

R900915686 4WREE6E1-16-2X/G24K31/A1V力士乐Rexroth

R900914841 4WREE6V1-32-2X/G24K31/A1V

R900913433 4WREE6EA16-2X/G24K31/A1V

R900913359 4WREE6W1-32-2X/G24K31/A1V

R900912521 4WREE6EA32-2X/G24K31/A1V力士乐Rexroth

R900912156 4WREE6E08-2X/G24K31/A1V

R900912154 4WREE6Q2-32-2X/G24K31/A1V

R900912150 4WREE6Q2-16-2X/G24K31/A1V

4WRBKE16R3-180SJ-1X/6ZG24K31/A1D3M(0811404938)

4WRAE6W30-2X/G24K31/A1V(R900954078)力士乐Rexroth

4WR, EE10E75-2X/G24K31/A1V (R900927230)

4WREE6E32-2X/G24K31/A1V-204 (R901161258)

4WREE6E32-2X/G2X/G24K31/A1V(R900907114)

4WREE6W32-2X/624K31 (R900911004)力士乐Rexroth