换向阀构成的制动油路，动臂在将铲斗举升到zui高位置和下降至zui低放平位置时能自行限位制动，图中的回位限位阀（即M型和H型四位四通换向阀）是靠钢球定位的，当铲斗移至限位点时碰触开关，二位电磁阀换向，接入压缩空气，将定位钢球压回槽内，回位限位阀便在弹簧作用下恢复中位，切断动臂油缸的进、回油油路，于是动臂连同铲斗一起被限位制动。 3、利用H型、Y型换向实现浮动。
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：
G122-202A001液压元件，
电子元器件，
威格士PARKER
迪普马ASCOMOOG、
机械零配件，
泵阀产品4WMM10E3X/F， D.C.Vlv:4WEH22 EA 7X/6E W230 N9K4
R983031467 D.C.Vlv:4WEH22 EB 7X/6E G24 N9K4
D.C.Vlv:4WEH22 EB 7X/6E W230 N9K4
R983031468 D.C.Vlv:4WEH22 G 7X/6E G24 N9K4
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R983031429 D.C.Vlv:4WEH22 G 7X/6E W230 N9K4
D.C.Vlv:4WEH22 GA 7X/6E G24 N9K4
D.C.Vlv:4WEH22 GA 7X/6E W230 N9K4 单向电磁阀HED8OP-2X/100P070K14S
R983031481 D.C.Vlv:4WEH22 GB 7X/6E G24 N9K4
D.C.Vlv:4WEH22 GB 7X/6E W230 N9K4
R983031469 D.C.Vlv:4WEH22 H 7X/6E G24 单向电磁阀HED8OP-2X/100P070K14SN9K4
R983031434 D.C.Vlv:4WEH22 H 7X/6E W230 N9K4
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D.C.Vlv:4WEH22 JA 7X/6E G24 N9K4
D.C.Vlv:4WEH22 JA 7X/6E W110 N9K4
D.C.Vlv:4WEH22 JA 7X/6E W230 N9K4
D.C.Vlv:4WEH22 JB 7X/6E G24 N9K4
D.C.Vlv:4WEH22 JB 7X/6E W110 N9K4
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FD12FB2X/400B03V12
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