德國Rexroth二級比例方向閥4WRKE用于控制液壓油的流向和流量。主級是受位置控制的，這樣，控制閥芯位置在流量較大的情況下也不會受液動力的影響。力士樂4WRKE型先導式比例方向閥zui大工作壓力350bar和zui大流量3000 l/min。
力士樂4WRKE型比例方向閥的特征：二級閥主要由比例閥的各個組件組成。"主級零電位"的零電位調(diào)節(jié)是工廠預設的，可以通過控制電子元件中的電位計，在公稱行程的±30%范圍內(nèi)進行調(diào)節(jié)。拆下閥體前面的塞螺釘后，方可對集成控制電子元件進行檢修。必須重新調(diào)節(jié)更換后的先導控制閥或控制電子元件。全部調(diào)節(jié)工作只能由的專業(yè)人員執(zhí)行。
相當于普通開環(huán)比例換向閥，力士樂4WRKE型比例方向閥可實現(xiàn)自身的閉環(huán)控制，故對于液流的大范圍突然變化不敏感，不會因作用在閥芯上的液動力而導致閥芯失控。這種閥同時還擁有比較好的頻率響應特性（頻率響應可達數(shù)十赫茲），特別適用于在設備的緊湊性加減速變換運動中對預緩沖有較高要求的場合。相對于伺服閥，此種閥的主級和先導級均采用滑閥結(jié)構，對油液清潔度不是很敏感，價格也便宜。閥的死區(qū)，增益，顫振和偏置等已在工廠內(nèi)按標準閥調(diào)整并封裝，故可維護性好，拆裝方便，安裝后不用調(diào)校，是一種即裝即用的高性能比例閥，在部分場合可替代伺服閥使用，用于控制液流的開啟、停止、方向。
力士樂4WRKE二級比例方向閥克服了現(xiàn)有產(chǎn)品比例電磁鐵所需推力大、易漏油的缺陷。它包括先導閥和主閥兩個部分；先導閥包括左右比例電磁鐵、閥體、設于閥體內(nèi)的閥芯；主閥包括主閥體和位于其中的閥芯，其特征在于：所述的先導閥閥體內(nèi)設一橫向油道，其兩端連接左右比例電磁鐵頂桿油腔，該油道中部設有回油孔，進入左右比例電磁鐵頂桿油腔的端口均設阻尼螺釘；主閥體的控制油口經(jīng)閥體內(nèi)的油道與先導閥閥體中部設的控制油道相通，該油道止路于先導閥閥體兩個環(huán)形沉割槽，先導閥芯的二個臺肩上均設有節(jié)流窗口。本實用新型結(jié)構新穎、比例電磁鐵所需推力小、密封要求低，有利于提高使用壽命、降低生產(chǎn)成本，可廣泛應用于塑機行業(yè)及機械加工設備的液壓控制系統(tǒng)中。
力士樂產(chǎn)品型號很多，不能一一列舉，以下是Rexroth二級比例方向閥4WRKE的部分常用型號：
4WRKE35E1-1000L-3X/6EG24EK31/A1D3V,R901100929
4WRKE35E1-1000L-3X/6EG24K31/F1D3V,R901052827
4WRKE35E1000L-3X/6EG24K31/A1D3M-905,R901132836
4WRKE35E1000L-3X/6EG24EK31/A1D3V,R901211507
4WRKE35E1000L-3X/6EG24K31/A1D3V,R901102529
4WRKE35R3-1000L-3X/6EG24K31/A1D3M,R901160858
4WRKE35R3-1000L-3X/6EG24K31/F1D3M,R901183466
4WRKE35E1-1000L-3X/6EG24ETK31/A5D3M,R900718331
4WRKE35E1-1000L-3X/6EG24K31/A5D3M,R901093110
4WRKE35E1-1000L-3X/6EG24K31/A5D3M-280,R900756658
4WRKE35W8-1000L-3X/6EG24ETK31/A5D3M,R900759331
4WRKE35W8-1000L-3X/6EG24K31/A5D3M,R900704404
4WRKE35W6-1000P-3X/6EG24EK31/C1D3M,R901242289
4WRKE35E1-1000L-3X/6EG24EK31/A1D3M,R901025013
4WRKE35E1-1000L-3X/6EG24K31/A1D3M,R901033705
4WRKE35E1-1000L-3X/6EG24K31/A1D3M-280,R901018298
4WRKE35E1-1000L-3X/6EG24K31/C1D3M,R901231227
4WRKE35W8-1000L-3X/6EG24EK31/A1D3M,R901054883
4WRKE35W8-1000L-3X/6EG24EK31/F1D3M,R901127413
4WRKE35W8-1000L-3X/6EG24ETK31/F1D3M,R901160961
4WRKE35W8-1000L-3X/6EG24K31/F1D3M,R901176133
4WRKE35W6-1000P-3X/6EG24K31/F1D3M,R901227838
4WRKE35E1000L-3X/6EG24EK31/C1D3M,R900762781
4WRKE35W6-1000L-3X/6EG24K31/C1D3M,R901240438
4WRKE35E1000L-3X/6EG24K31/A5D3M,R900726602
4WRKE35W6-1000L-3X/6EG24K31/A5D3M,R900715082
4WRKE35E1000L-3X/6EG24ETK31/A1D3M,R900717029
4WRKE35E1000L-3X/6EG24K31/A1D3M,R900773355
4WRKE35E1000L-3X/6EG24K31/A1D3M-280,R901024647
4WRKE35E1000L-3X/6EG24K31/C1D3M,R901177187
4WRKE35W6-1000L-3X/6EG24EK31/A1D3M,R901094074
4WRKE35W6-1000L-3X/6EG24EK31/F1D3M,R901263621
4WRKE35W6-1000L-3X/6EG24ETK31/A1D3M,R900717030
4WRKE35W6-1000L-3X/6EG24K31/F1D3M,R900773088
4WRKE32E1-600L-3X/6EG24EK31/A1D3V,R901268348
4WRKE32W8-600L-3X/6EG24K31/A1D3V,R901056252
4WRKE32E3-600L-3X/6EG24EK31/A5D3M-280,R900749131
4WRKE32W6-600P-3X/6EG24EK31/F1D3V,R901047149
4WRKE32E3-400L-3X/6EG24K31/F1D3M,R901224967
4WRKE32E3-600L-3X/6EG24K31/F1D3M,R901213323
4WRKE32R3-400L-3X/6EG24K31/A1D3M,R901201718
4WRKE32R3-400L-3X/6EG24K31/F1D3M,R901183869
4WRKE32R3-600L-3X/6EG24K31/F1D3M,R901183870
4WRKE32E600L-3X/6EG24K31/A1D3V,R900739618
4WRKE32W6-600L-3X/6EG24ETK31/F1D3V,R901153481
4WRKE32W6-600L-3X/6EG24K31/A1D3V,R901238441
4WRKE32W8-600P-3X/6EG24K31/A5D3M,R900721885
4WRKE32E1-600P-3X/6EG24K31/A1D3M,R901100916
4WRKE32W8-600P-3X/6EG24K31/F1D3M,R901167507
4WRKE32W8-600L-3X/6EG24K31/C1D3M,R901299712
4WRKE32E1-600L-3X/6EG24EK31/A5D3M-280,R900716436
4WRKE32E1-600L-3X/6EG24K31/A5D3M,R900753006
4WRKE32E1-600L-3X/6EG24K31/A5D3M-280,R900711650
4WRKE32W8-600L-3X/6EG24EK31/A5D3M,R900747304
4WRKE32W8-600L-3X/6EG24ETK31/A5D3M,R901014199
4WRKE32W8-600L-3X/6EG24K31/A5D3M,R900704403
4WRKE32E1-600L-3X/6EG24EK31/A1D3M,R901117336
4WRKE32E1-600L-3X/6EG24K31/A1D3M,R901102982
4WRKE32E1-600L-3X/6EG24K31/A1D3M-280,R901089781
4WRKE32E1-600L-3X/6EG24K31/C1D3M,R901231200
4WRKE32E1-600L-3X/6EG24K31/F1D3M,R901141349
4WRKE32W8-400L-3X/6EG24EK31/A1D3M,R901107424
4WRKE32W8-400L-3X/6EG24EK31/F1D3M,R901121949
4WRKE32W8-600L-3X/6EG24EK31/A1D3M,R901090623
4WRKE32W8-600L-3X/6EG24EK31/F1D3M,R901093095
4WRKE32W8-600L-3X/6EG24ETK31/F1D3M,R901055130
4WRKE32W8-600L-3X/6EG24K31/A1D3M,R901023120
4WRKE32W8-600L-3X/6EG24K31/F1D3M,R900709134
4WRKE32E400S-3X/6EG24ETK31/A5D3M,R900743960
4WRKE32W6-600P-3X/6EG24EK31/A5D3M,R900740749
4WRKE32W6-600P-3X/6EG24EK31/A5D3M-280,R901096192
4WRKE32W6-600P-3X/6EG24K31/A1D3M-280,R901184378
4WRKE32W6-600P-3X/6EG24EK31/A1D3M,R901026641
4WRKE32W6-600P-3X/6EG24EK31/C1D3M,R901011230
4WRKE32E400L-3X/6EG24K31/A5D3M-280,R901119343
4WRKE32E600L-3X/6EG24EK31/A5D3M,R900717062
4WRKE32E600L-3X/6EG24EK31/A5D3M-280,R900762393
4WRKE32E600L-3X/6EG24ETK31/A5D3M,R900712050
4WRKE32E600L-3X/6EG24K31/A5D3M,R900713637
4WRKE32E600L-3X/6EG24K31/A5D3M-280,R900713635
4WRKE32E600L-3X/6EG24TK31/A5D3M,R901067075
4WRKE32W6-400L-3X/6EG24EK31/A5D3M,R900773692
4WRKE32W6-600L-3X/6EG24K31/A5D3M,R900721875
4WRKE32E400L-3X/6EG24K31/A1D3M,R901190018
4WRKE32E600L-3X/6EG24EK31/A1D3M,R901033473
4WRKE32E600L-3X/6EG24EK31/A1D3M-280,R901018297
4WRKE32E600L-3X/6EG24ETK31/A1D3M,R901016496
4WRKE32E600L-3X/6EG24K31/A1D3M,R900734062
4WRKE32E600L-3X/6EG24K31/A1D3M-280,R900249917
4WRKE32E600L-3X/6EG24K31/C1D3M,R900712759
4WRKE32E600L-3X/6EG24K31/F1D3M,R900245364
4WRKE32W6-400L-3X/6EG24EK31/F1D3M,R901122589
4WRKE32W6-400L-3X/6EG24K31/A1D3M,R901044433
4WRKE32W6-400L-3X/6EG24K31/F1D3M,R901117295
4WRKE32W6-600L-3X/6EG24EK31/A1D3M,R901088904
4WRKE32W6-600L-3X/6EG24EK31/F1D3M,R901016317
4WRKE32W6-600L-3X/6EG24ETK31/A1D3M,R900249276
4WRKE32W6-600L-3X/6EG24K31/A1D3M,R900780615
4WRKE32W6-600L-3X/6EG24K31/F1D3M,R900762389
4WRKE25R350L-3X/6EG24EK31/A1D3V,R901100919
4WRKE27W4-500L-3X/6EG24K31/A5D3M,R900708992
4WRKE27E1-500L-3X/6EG24EK31/A1D3V,R901268865
4WRKE27E1-500L-3X/6EG24K31/A1D3V,R901079320
4WRKE27W6-500L-3X/6EG24K31/A5D3V,R901050041
4WRKE27E500L-3X/6EG24EK31/A1D3V,R901266055
4WRKE27E500L-3X/6EG24K31/A1D3V,R901077093
4WRKE27E1-500L-3X/6EG24K31/C1D3M,R901229824
4WRKE25W1-350P-3X/6EG24EK31/A5D3M-706,R900709842
4WRKE25E3-350P-3X/6EG24K31/A5D3M,R900784875
4WRKE25E3-350P-3X/6EG24TK31/A5D3M,R901095293
4WRKE27W8-500L-3X/6EG24K31/A5D3M,R900706180
4WRKE25R3-350P-3X/6EG24K31/A1D3M,R900771042
4WRKE27E1-500L-3X/6EG24EK31/A1D3M,R900249274
4WRKE27E1-500L-3X/6EG24EK31/F1D3M,R901296528
4WRKE27E1-500L-3X/6EG24ETK31/A1D3M,R901051417
4WRKE27E1-500L-3X/6EG24K31/A1D3M,R900249923
4WRKE27W8-500L-3X/6EG24EK31/A1D3M,R900701429
4WRKE27W8-500L-3X/6EG24EK31/F1D3M,R901097952
4WRKE27W8-500L-3X/6EG24ETK31/A1D3M,R901199286
4WRKE27W8-500L-3X/6EG24K31/A1D3M,R900750794
4WRKE27W8-500L-3X/6EG24K31/F1D3M,R901072883
4WRKE25R3-350L-3X/6EG24EK31/C1D3M,R901308193
4WRKE27E500P-3X/6EG24ETK31/A1D3M,R901210319
4WRKE25E3-350L-3X/6EG24EK31/A5D3M,R900746579
4WRKE25E3-350L-3X/6EG24K31/A5D3M,R900977507
4WRKE25R350L-3X/6EG24K31/A5D3M,R901026399
4WRKE25W3-350L-3X/6EG24K31/A5D3M,R900768941
4WRKE25E350P-3X/6EG24K31/A5D3V,R901291595
4WRKE27E500L-3X/6EG24EK31/A5D3M,R901025115
4WRKE27E500L-3X/6EG24K31/A5D3M,R901135347
4WRKE27W6-500L-3X/6EG24EK31/A5D3M,R900735040
4WRKE27W6-500L-3X/6EG24K31/A5D3M,R900616821
4WRKE25W8-220L-3X/6EG24EK31/A1D3V,R901006429
4WRKE25W8-350L-3X/6EG24ETK31/F1D3V,R901191330
4WRKE25W8-350L-3X/6EG24K31/A1D3V,R901056249
4WRKE25R3-350L-3X/6EG24K31/A1D3M,R901201717
4WRKE25R350L-3X/6EG24EK31/A1D3M,R901125163
4WRKE25R350L-3X/6EG24EK31/A1D3M-280,R901216124
4WRKE25W9-350L-3X/6EG24K31/A1D3M,R900727368
4WRKE25W6-350P-3X/6EG24EK31/A1D3V,R901268350
4WRKE27E500L-3X/6EG24EK31/A1D3M,R901039097
4WRKE27E500L-3X/6EG24EK31/F1D3M,R901267566
4WRKE27E500L-3X/6EG24K31/C1D3M,R901130165
4WRKE27E500L-3X/6EG24K31/F1D3M,R901133144
4WRKE27W6-500L-3X/6EG24EK31/A1D3M,R901041512
4WRKE27W6-500L-3X/6EG24EK31/F1D3M,R901169415
4WRKE27W6-500L-3X/6EG24ETK31/A1D3M,R901169989
4WRKE27W6-500L-3X/6EG24K31/A1D3M,R900731496
4WRKE27W6-500L-3X/6EG24K31/F1D3M,R901147944
4WRKE25E350L-3X/6EG24K31/A5D3V,R901214428
4WRKE25W6-350L-3X/6EG24K31/A5D3V,R901047568
4WRKE25E1-350P-3X/6EG24EK31/A5D3M,R900713633
4WRKE25E1-350P-3X/6EG24K31/A5D3M,R900787373
4WRKE25W8-350P-3X/6EG24K31/A5D3M,R900709020
4WRKE25E350L-3X/6EG24K31/A1D3V,R901229184
4WRKE25E350L-3X/6EG24K31/F1D3V,R901114885
4WRKE25W6-220L-3X/6EG24K31/A1D3V,R901108789
4WRKE25W6-350L-3X/6EG24K31/A1D3V,R900706551
4WRKE25E1-350P-3X/6EG24EK31/A1D3M,R901072882
4WRKE25W8-350P-3X/6EG24EK31/A1D3M,R901059574
4WRKE25W8-350P-3X/6EG24K31/F1D3M,R901167508
4WRKE25W6-350P-3X/6EG24EK31/C1D3M,R901171085
4WRKE25E1-350L-3X/6EG24EK31/A5D3M,R900977502
4WRKE25E1-350L-3X/6EG24K31/A5D3M,R900704756
4WRKE25W8-220L-3X/6EG24EK31/A5D3M-280,R900713634
4WRKE25W8-350L-3X/6EG24EK31/A5D3M,R900977505
4WRKE25W8-350L-3X/6EG24EK31/A5D3M-280,R900720556
4WRKE25W8-350L-3X/6EG24K31/A5D3M,R900705775
4WRKE25E350P-3X/6EG24EK31/A5D3M,R901108088
4WRKE25E350P-3X/6EG24ETK31/A5D3M,R900710256
4WRKE25E350P-3X/6EG24K31/A5D3M,R900733297
4WRKE25W6-350P-3X/6EG24K31/A5D3M,R900748597
4WRKE25E1-220L-3X/6EG24EK31/A1D3M,R901189931
4WRKE25E1-220L-3X/6EG24EK31/F1D3M,R901297584
4WRKE25E1-220L-3X/6EG24K31/A1D3M,R901001641
4WRKE25E1-220L-3X/6EG24K31/A1D3M-280,R901179163
4WRKE25E1-350L-3X/6EG24EK31/A1D3M,R900772022
4WRKE25E1-350L-3X/6EG24EK31/A1D3M-280,R901075370
4WRKE25E1-350L-3X/6EG24K31/A1D3M,R900973368
4WRKE25E1-350L-3X/6EG24K31/A1D3M-280,R900249919
4WRKE25E1-350L-3X/6EG24K31/C1D3M,R901219179
4WRKE25W8-220L-3X/6EG24EK31/A1D3M,R901038659
4WRKE25W8-220L-3X/6EG24EK31/F1D3M,R900751048
4WRKE25W8-220L-3X/6EG24ETK31/F1D3M,R900766959
4WRKE25W8-220L-3X/6EG24K31/A1D3M,R900721996
4WRKE25W8-220L-3X/6EG24K31/F1D3M,R900711318
4WRKE25W8-350L-3X/6EG24EK31/A1D3M,R900245067
4WRKE25W8-350L-3X/6EG24EK31/F1D3M,R900705057
4WRKE25W8-350L-3X/6EG24ETK31/A1D3M,R900731881
4WRKE25W8-350L-3X/6EG24ETK31/F1D3M,R900743953
4WRKE25W8-350L-3X/6EG24K31/A1D3M,R900249554
4WRKE25W8-350L-3X/6EG24K31/F1D3M,R900979857
4WRKE25E220P-3X/6EG24EK31/A1D3M,R901059570
4WRKE25E350P-3X/6EG24EK31/A1D3M,R900770264
4WRKE25E350P-3X/6EG24ETK31/A1D3M,R901195767
4WRKE25E350P-3X/6EG24K31/A1D3M,R900717614
4WRKE25W6-220P-3X/6EG24ETK31/A1D3M,R901146836
4WRKE25W6-350P-3X/6EG24EK31/A1D3M,R901059573
4WRKE25W6-350P-3X/6EG24EK31/F1D3M,R901066669
4WRKE25W6-350P-3X/6EG24K31/F1D3M,R901047148
4WRKE25E350L-3X/6EG24EK31/C1D3M,R900727103
4WRKE25E350L-3X/6EG24K31/C1D3M,R901252931
4WRKE25W6-350L-3X/6EG24EK31/C1D3M,R901170141
4WRKE25E220L-3X/6EG24K31/A5D3M,R901045426
4WRKE25E350L-3X/6EG24EK31/A5D3M,R900703649
4WRKE25E350L-3X/6EG24EK31/A5D3M-280,R900720557
4WRKE25E350L-3X/6EG24ETK31/A5D3M,R900713823
4WRKE25E350L-3X/6EG24K31/A5D3M,R900703904
4WRKE25E350L-3X/6EG24K31/A5D3M-280,R900767509
4WRKE25W6-350L-3X/6EG24EK31/A5D3M,R900717051
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4WRKE10W6-25L-3X/6EG24ETK31/F1D3M,R901202900
4WRKE10W6-25L-3X/6EG24K31/A1D3M,R901131241
4WRKE10W6-50L-3X/6EG24EK31/A1D3M,R900719667
4WRKE10W6-50L-3X/6EG24EK31/F1D3M,R901217997
4WRKE10W6-50L-3X/6EG24ETK31/F1D3M,R900749617
4WRKE10W6-50L-3X/6EG24K31/A1D3M,R900713239
4WRKE10W6-50L-3X/6EG24K31/F1D3M,R900705350
4WRKE16W6A200L-3X/6EG24ETK31/A5D3M,R900704401
4WRKE10W100P-3X/6EG24K31/A5D3M-693=DE,R900246010
4WRKE10W1-100P-3X/6EG24ETK31/A5D3M-706,R900715737
4WRKE10W4-100P-3X/6EG24K31/A5D3M-683,R900718465
4WRKE10W5-100L-3X/6EG24K31/A5D3M-182,R900771222
4WRKE10W5-100P-3X/6EG24K31/A5D3M-683,R900708955
4WRKE16W5-125L-3X/6EG24K31/A5D3M-683,R900977509
德國4WRKE是一種高性能閉環(huán)比例方向閥，通過先導比例閥控制主閥芯的動作，在主閥體上裝有一高精度的電位置反饋器及內(nèi)置放大器，用于閥自身的閉環(huán)控制，可對液流的方向及流量進行成比例的精確控制。但在使用中也暴露出一些問題，如果不能引起高度的重視，可能會嚴重制約設備的穩(wěn)定運行，縮短使用壽命，增加維護費用。
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