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R900937718 4WRA6EA15-2X/G24N9K4/V
R900938827 4WRA6EA15-2X/G24K4/V-589
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R900940043 4WRA6W1-15-2X/G24N9K4/V
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R900940546 4WRA6W1-07-2X/G24N9K4/V
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R900945520 4WRA6W3-15-2X/G24N9K4/V
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R900947149 4WRA6E03-2X/G24N9K4/V
R900947417 4WRA6WA30-2X/G24N9K4/V-589
R900947693 4WRA6EB30-2X/G24K4/V
R900947835 4WRA6E1-30-2X/G24K4/V
R900949337 4WRA6W07-2X/G24N9K4/V-589
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R900949993 4WRA10E30-2X/G24N9K4/V-589
R900950144 4WRAE6W07-2X/G24N9K31/F1V
R900950774 4WRAE6W1-15-2X/G24N9K31/F1V
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R900953168 4WRAE6E03-2X/G24N9K31/A1V
R900953496 4WRAE10W1-30-2X/G24K31/A1V
R900954053 4WRA6E1-15-2X/G24K4/V
R900954054 4WRA6EA15-2X/G24K4/V
R900954055 4WRA6EA30-2X/G24K4/V
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R900954057 4WRA6W1-15-2X/G24K4/V
R900954058 4WRA6W1-30-2X/G24K4/V
R900954059 4WRA6WA15-2X/G24K4/V
R900954061 4WRA10E60-2X/G24K4/V
R900954064 4WRA10EA60-2X/G24K4/V
R900954065 4WRA10W60-2X/G24K4/V
R900954069 4WRAE6E07-2X/G24K31/A1V
R900954071 4WRAE6E30-2X/G24K31/A1V
R900954077 4WRAE6W15-2X/G24K31/A1V
R900954083 4WRAE10E60-2X/G24K31/A1V
R900954085 4WRAE10EA30-2X/G24K31/A1V
R900954088 4WRAE10W60-2X/G24K31/A1V
R900954109 4WRAE10EA30-2X/G24N9K31/F1V
R900954403 4WRA6E15-2X/G24K4/V-589
R900954407 4WRA6W30-2X/G24K4/V
R900960406 4WRA10EA30-2X/G24N9K4/V-589
R900961533 4WRA6WA15-2X/G24N9K4/V
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R900963345 4WRA6EB07-2X/G24N9K4/V
R900964834 4WRA6EA03-2X/G24N9K4/V
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R978879338 4WRAB6E12-1X/G24N9K4/MR
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电磁比例换向阀（带反馈） 4WRE(E)...2X...
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R900346806 4WRE6E32-1X/24K4/M
R900361147 4WRE6EA08-1X/24K4/M
R900377130 4WRE6E08-1X/24K4/M
R900377131 4WRE6E16-1X/24K4/M
R900379046 4WRE6E08-1X/24K4/V
R900385562 4WRE6W16-1X/24K4/M
R900388681 4WRE6W08-1X/24K4/M
R900392344 4WRE10E64-1X/24K4/M
R900392345 4WRE10E32-1X/24K4/M
R900392346 4WRE10W32-1X/24K4/M
R900499564 4WRE6W32-1X/24K4/M
R900549113 4WRE10E1-32-1X/24K4/M
R900551280 4WRE6W1-08-1X/24K4/M
R900582331 4WRE10E16-1X/24K4/M
R900608420 4WRE10W3-75-2X/G24K4/V
R900616612 4WREE6E04-2X/G24K31/A1V-655
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R900617766 4WREE6WA16-2X/G24K31/F1V
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R900711783 4WRE6E00-2X/G24K4/V-712
R900720198 4WRE6EA16-2X/G24K4/V
R900724343 4WREE10EB75-2X/G24K31/F1V
R900742402 4WRE10EA32-1X/24K4/V
R900752971 4WRE10EA50-2X/G24K4/V
R900767561 4WREE10EA25-2X/G24K31/F1V
R900779950 4WREE10V25-2X/G24K31/F1V
R900904591 4WRE10W64-1X/24K4/M
R900906728 4WRE6W1-32-1X/24K4/M
R900907114 4WREE6E32-2X/G24K31/A1V
R900907440 4WREE6V16-2X/G24K31/A1V
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R900911681 4WREE6V32-2X/G24K31/A1V
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R900915686 4WREE6E1-16-2X/G24K31/A1V
R900916317 4WRE10E1-64-1X/24K4/M
R900916322 4WRE10V32-1X/24K4/M
R900916323 4WRE10V64-1X/24K4/M
R900916324 4WRE10W1-64-1X/24K4/M
R900916325 4WRE10W16-1X/24K4/M
R900916327 4WRE6EA32-1X/24K4/M
R900916330 4WRE6WA16-1X/24K4/M
R900916331 4WRE6WA32-1X/24K4/M
4WREE10V25-2X/G24K31/F1V
3结论
产品设计是个综合信息处理的复杂过程，它终的结果是把线条、符号、数字绘制成合理的设计图样，设计人员应从以下几个方面综合考虑;
(l)简化每个零件的形状，使机器结构简单;
(2)合并零件的功能，减少零件的种类或数量;
(3)应用新结构、新工艺、新材料、新原理来简化产品结构，提高产品的可靠性;
(4)分解部件，研究其装配、组装的简单的结构;
(5)对相似零件进行分组;
(6)对相似产品按标准数序列进行产品系列化分析;
(7)实现产品零件的通用化和标准化。
产品设计人员提高设计质量的关键在于自觉、主动地学习与生产加工过程和加工工艺方面有关的知识，熟练掌握设计技巧。
开式系统
开式系统是指液压泵1从油箱5吸油，通过换向阀2给液压缸3(或液压马达)供油以驱动工作机构，液压缸3(或液压马达)的回油再经换向阀回油箱。在泵出口处装溢流阀4。这种系统结构较为简单。由于系统工作完的油液回油箱，因此可以发挥油箱的散热、沉淀杂质的作用。但因油液常与空气接触，使空气易于渗入系统，导致路上需设置背压阀，这将引起附加的能量损失，使油温升高。
在开式系统中，采用的液压泵为定量泵或单向变量泵，考虑到泵的自吸能力和避免产生吸空现象，对自吸能力差的液压泵，通常将其工作转速限制在额定转速的75%以内，或增设一个辅助泵进行灌注。工作机构的换向则借助于换向阀铸造。换向阀换向时，除了产生液压冲击外，运动部件的惯性能将转变为热能，而使液压油的温度升高。但由于开式系统结构简单，仍被大多数起重机所采用。
闭式系统
在闭式系统中，液压泵的进油管直接与执行元件的回油管相连，工作液体在系统的管路中进行封闭循环。闭式系统结构较为紧凑，不口空气接触机会较少，空气不易渗入系统，故传动的平稳性好。工作机构的变速和换向靠调节泵或马达的变量机构实现，避免了在开式系统换向过程中所出现的液压冲击和能量损失。但闭式系统较开式系统复杂，由于闭式系统工作完的油液不回油箱，油液的散热和过滤的条件较开式系统差。为了补偿系统中的泄漏，通常需要一个小容量的补液泵进行补油和散热，因此这种系统实际上是一个半闭式系统。
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