有些带泄油口的液压阀，其泄油口必须直接通油箱，最好不要与系统中总回油管相连接R900963242 4WRZE 16 W8-150-7X/6EG24K31/A1D3M

R900963835 4WRZ 10 W6-85-7X/6EG24N9K4/M

R900964709 4WRZE 16 W6-100-7X/6EG24N9ETK31/A1D3M

R900965071 4WREE 6 W1-08-2X/G24K31/F1V

R900965185 4WREE 10 W1-50-2X/G24K31/F1V

R900965674 4WRAE 10 E60-2X/G24K31/F1V

R900965891 4WRH 16 W8-150-7X//M

R900966472 4WRZ 25 E220-7X/6EG24N9TK4/M

R900966566 4WRZ 16 E150-7X/6EG24N9ETK4/D3M

R900966740 4WRA 10 EA60-2X/G24N9K4/V-674

R900967019 4WRTE 10 R3-100S-4X/6EG24K31/A1M

R900967036 4WRTE 16 R3-200S-4X/6EG24K31/A1M

R900967041 4WRTE 16 W8-200S-4X/6EG24K31/A1M

R900967208 4WRZ 10 E50-7X/6EG24N9K4/M

R900968534 4WRZ 25 W8-220-7X/6EG24N9EK4/D3M

R900969670 4WRDE 10 V100L-5X/6L24K9/MR-280

R900969686 4WRZ 10 E85-7X/6EG24N9K4/M

R900970193 4WRZ 10 W6-85-7X/6EG24N9ETK4/M

R900970564 4WRZ 16 E150-7X/6EG24N9EK4/D3M

R900970766 4WRZ 10 W6-50-7X/6EG24N9ETK4/D3M

R900970876 4WRTE 25 V350L-4X/6EG24EK31/A1M

R900970951 4WRZ 16 W8-150-7X/6EG24N9EK4/M

R900971343 4WRZ 32 E520-7X/6EG24N9K4/D3M

R900971345 4WRZ 16 E150-7X/6EG24N9K4/D3M

R900971474 4WRZ 10 W6-85-7X/6EG24N9TK4/M

R900971638 4WRTE 10 E100S-4X/6EG24K31/A1M

R900972233 4WRZ 16 W8-150-7X/6EG24N9K4/M

R900972658 4WRAP 6 W7-07-3X=G24K4/M=00

R900972827 4WRA 6 W1-07-2X/G24K4/V

R900973017 4WRZ 16 W8-150-7X/6EG24N9TK4/D3M

R900973309 4WRDE 16 V1-125L-5X/6L24K9/M

R900973572 4WRZ 16 W6-100-7X/6EG24N9EK4/D3M

R900973643 4WRTE 32 E600L-4X/6EG24EK31/A1M

R900974152 4WRE 10 W1-25-2X/G24K4/V

R900974227 4WREE 10 W50-2X/G24K31/A1V-280

R900974410 4WRZ 16 W6-150-7X/6EG24N9ETK4/D3M

R900974817 4WRAE 6 W1-30-2X/G24K31/F1V

R900975264 4WRTE 16 V200L-4X/6EG24EK31/A1M

R900975491 4WRZE 16 E150-7X/6EG24N9ETK31/A1D3M

R900975898 4WRZ 25 W8-220-7X/6EG24N9ETK4/D3M

R900975899 4WRZ 25 W8-325-7X/6EG24N9EK4/D3M

R900976119 4WREE 10 W1-75-2X/G24K31/F1V

R900976334 4WREE 10 V1-25-2X/G24K31/F1V

R900976919 4WRAE 6 W15-2X/G24K31/F1V

R900977311 4WRKE 16 W6-200L-3X/6EG24EK31/A1D3M

R900977344 4WRTE 27 W8-500L-4X/6EG24K31/A1M

R900977345 4WRTE 27 W6-500L-4X/6EG24K31/A1M

R900977490 4WRZE 16 W6-150-7X/6EG24N9ETK31/A1D3M

R900977506 4WRKE 16 E1-200L-3X/6EG24K31/A5D3M

R900977903 4WRZ 25 W6-220-7X/6EG24N9K4/D3M

R900977989 4WRZ 10 E85-7X/6EG24N9ETK4/M

R900977990 4WRZ 10 E1-85-7X/6EG24N9ETK4/M

R900978354 4WRZ 16 W8-150-7X/6EG24N9TK4/M

R900978732 4WRZ 25 W6-220-7X/6EG24N9ETK4/D3M

R900978826 4WRZ 25 W8-220-7X/6EG24N9K4/D3M

R900979510 4WRZ 25 E325-7X/6EG24N9ETK4/D3M

R901004132 4WRZE 25 W8-220-7X/6EG24EK31/F1D3M

R901004329 4WRZE 25 W8-220-7X/6EG24N9K31/F1D3M

R901004386 4WRZE 25 E325-7X/6EG24N9EK31/A1M

R901004402 4WRZ 10 W6-50-7X/6EG24N9TK4/D3M

R901005136 4WRDE 16 W1-200L-5X/6L24EK9/WG152M

R901005192 4WRKE 25 W6-220L-3X/6EG24EK31/A1D3M

R901006305 4WRZE 32 W8-360-7X/6EG24N9ETK31/F1D3M

R901007261 4WRZE 32 W8-520-7X/6EG24N9EK31/F1D3M

R901011154 4WRZE 10 W8-85-7X/6EG24N9K31/F1V

R901011682 4WRKE 16 R3-125L-3X/6EG24EK31/A1D3M

R901014935 4WRZE 10 W6-85-7X/6EG24N9K31/F1D3M

R901014937 4WRZE 16 W6-150-7X/6EG24N9K31/F1D3M

R901014940 4WRZE 25 W8-325-7X/6EG24N9K31/F1D3M

R901015076 4WRZE 10 E1-85-7X/6EG24N9K31/A1D3M，否则会造成意想不到的后果，例如：减压阀的泄油管若与总回油管相连接时，由于在工作中系统总回油管中的流量会随时变化，使通过回油管中油液的压力损失在不断变化，DBDS10K-1X/400，DBDS6K1X/315 ，DBDS10K1X/400， DBDS10G-1X/200 ，DBDS20K1X/200， DBDS20K1X/50，DBDS10K1X/315 ，DBDS10K18/25，DBDS6K-1X/100， DBDS10P1X/400， DBDS6K1X/315，DBDS10K1X/315 ，DBDS10P1X/200，DBDS6K121X/100 ，DBDS10-P-1X/200， DBDS10K18/25 ，DBDS10-P-1X/200， DBDS10K18/25，DBDS20P10 ，DBDS10P1X/200 ，DBDS10G12/200，DBDS20K1X/50，DBDS6K1/315，DBDS6P1X/ 315，DBDS20P1X/315，DBDS10P1X/315，DBDS6P1X/315， DBDH10P-1X/200 ，DBDS10G-1X/200V，DBDS10G-1X/25，DBDS10K-1X/200，DBDS10K-1X/315,DBDS10K-1X/315，DBDS20G-1X/315V，DBDS20K-1X/200，DBDS20K-1X/315，DBDS20P-10/315，DBDS10-P1X/315， DBDS10K1X/400， DBDS10K1X/400， DBDS10G-1X/200， DBDH10G10/200 ，DBDS-20K-1X/315，DBDS10K1-1X/315，DBDS10K1-1X/100，DBDS6K-1X/100， DBDS6K-1X/100， DBDS10K1X/315，DBDS10K1X/315，DBDS6K-1X/100 ，DBDS6K-1X/100， DBDS20P1X/250， DBDS10K1X/315， DBDS10K18/25， DBDS6K1X/100，DBDS6K-1X/100， DBDS6G10/400， DBDS10P1X/200， DBDS6K121X/100， DBDS10G-1X/200 ，DBDS10-P-1X/200，DBDS10K18/25 ，DN10DBDS-10K10/315，DBDS6K1X/315 ，DBDS10P1X/200， DBDS6K121X/100 ，DBDS10-P-1X/200，DBDS10K18/25， DBDS6P1X/ 315 ，DBDS10-P-1X/200 ，DBDS10K18/25， DBDS10P1X/200， DBDS6K121X/100，DBDS10-P-1X/200，DBDS10K18/25， DBDS10-P-1X/200， DBDS10K18/25， DN10DBDS-10K10/315 ，DBDS6K1X/315，DBDH10P/400，DBDH6P1X/315，DBDS30G1X/315，DBDS10P1X/200，DBDS6G1X/315,DBDS10K1X/315，DBDS20K1X/315， DBDS20P1X/200，DBDS20P10，DBDS30P1X/200V,DBDS30K1X/315V，DBDS30K1X/315，DBDS30K1X/25,DBDS25G1X/315，DBDA20P1X/25，DBDA20G1X/25，DBDA20K1X/100，DBDA20K1X/25V，DBDH20K1X/50，DBDA15G1X/25，DBDA10P1X/， DBDA10G1X/630V，DBDA10G1X/25V，DBDA10K1X/400，DBDH10P1X/50V，DBDH10G1X/315V，DBDS10P1X/25V，DBDS10K1X/315V，DBDA6P1X/25，DBDA6G1X/315V，DBDS6P1X/200V，DBDS6G1X/315，DBDH25G1X/50，DBDS20P1X/315，DBDS20P1X/100，DBDS20G1X/400V，DBDS20G1X/315V，DBDS20K1X/25，DBDH15G1X/100V，DBDH10P1X/315，DBDH6P1X/50V，DBDH6K1X/400，DBDH6K1X/315，DBDS6P1X/100，DBDS20G1X/100V，DBDH10K1X/50，DBDS6P1X/50V，DBDS6K1X/200，就会造成减压阀输出压力不稳定。2、有些中位卸荷的电液换向阀（如：力士乐系列G、H、F、P、T型等），在控制油口没单独预接控制油的情况下，电液阀无法换向，因此对内控型的电液换向阀必须在其P口加一预压阀或在回油口加一背压阀（产生的背压一般在1Mpa以上，不同厂家、不同规格、不同流量的液压阀该背压值会不同），且其外泄口必须单独接油箱。对外控型的电液换向阀，其控制油口必须连接到在系统工作的各种工况下始终能产生1Mpa以上压力的位置。DBDH20K1X/50，DBDA15G1X/25，DBDA10P1X/， DBDA10G1X/630V，DBDA10G1X/25V，DBDA10K1X/400，DBDH10P1X/50V，DBDH10G1X/315V，DBDS10P1X/25V，DBDS10K1X/315V，DBDA6P1X/25，DBDA6G1X/315V，DBDS6P1X/200V，DBDS6G1X/315，DBDH25G1X/50，DBDS20P1X/315，DBDS20P1X/100，DBDS20G1X/400V，DBDS20G1X/315V，DBDS20K1X/25，DBDH15G1X/100V，DBDH10P1X/315，DBDH6P1X/50V，DBDH6K1X/400，DBDH6K1X/315，DBDS6P1X/100，DBDS20G1X/100V，DBDH10K1X/50，DBDS6P1X/50V，DBDS6K1X/200，DBDS10P1X/50，DBDS10G1X/315V，DBDA6G1X/400V，DBDH6G1X/315V，DBDS6P1X/315V，DBDS6P1X/200，DBDS30G1X/200V，DBDS30G1X/100，DBDH25G1X/100V，DBDS25G1X/315V，DBDS25G1X/315V，DBDA20G1X/50V，DBDA20 K1X/50V，DBDS20G1X/400，DBDS20K1X/50，DBDS15G1X/400，DBDA10P1X/25V，DBDH10P1X/50，DBDH10G1X/400，DBDS10P1X/630V，DBDS10G1X/25V，

DBDS10K1X/25，DBDA8G1X/25V，DBDH8G1X/400，DBDH6P1X/100V，DBDS6P1X/50，DBDS6K1X/50，DBDH30G1X/25，DBDH30K1X/25，DBDS30G1X/50，DBDS30K1X/200，DBDA20P1X/100，DBDH20P1X/25， DBDS20P1X/315，DBDS20P1X/50，DBDS20K1X/50V，DBDH10G1X/100，DBDH10K1X/200， DBDS10G1X/630， DBDS10K1X/315， DBDA6K1X/100V，DBDH6G1X/400V， DBDS6G1X/25，DBDH10P1X/200V，DBDH10K1X/630V，DBDS10G1X/25，DBDS6G1X/400V，DBDS6G1X/400V，DBDS6K1X/400V，DBDS6K1X/50V，DBDS6K1X/50V，DBDS20K-10/100， DBDS20K-10/25，DBDS6K121X/100， DBDS10-P-1X/200 ，DBDS10K18/25 ，DBDH6G1/315， DBDH6G18/400/12，DBD15G10/315， DBDS6K1X/200， DBDS20P1X/3150811404274 4WRLE16Q5-200M-3X/G24ETK0/B5M-774

0811404273 4WRLE16W1-200M-3X/G24EK0/A1WX02M-779

0811404272 4WRLE16V200M-3X/G24K0/F1M

0811404271 4WRLE16V120M-3X/G24K0/B5M

0811404270 4WRLE16Q4-200M-3X/G24ETK0/A1M

0811404269 4WRLE16V200M-3X/G24K0/B5M

0811404266 4WRLE16V1-150P-3X/G24K0/A1M

0811404265 4WRLE16V1-90P-3X/G24K0/A1M

0811404264 4WRLE16V150P-3X/G24K0/A1M

0811404263 4WRLE16V90P-3X/G24K0/A1M

0811404261 4WRLE16X200M-3X/G24K0/A1M-812

0811404260 4WRLE16X00M-3X/G24K0/A1M-778

0811404259 4WRLE16X200M-3X/G24EK0/A1M-812

0811404258 4WRLE16X200M-3X/G24ETK0/A1M-812

0811404257 4WRLE16Q5-85M-3X/G24K0/A1M-775

0811404256 4WRLE16X200M-3X/G24K0/A1M-0811

0811404254 4WRLE16Q5-200M-3X/G24TK0/B5M-774

0811404252 4WRLE16Q5-200M-3X/G24K0/A1M

0811404251 4WRLE16V200M-3X/G24K0/A1M

0811404250 4WRLE16V120M-3X/G24K0/A1M

0811404247 4WRL16WZ180S-3X/G24ETZ4/M

0811404241 4WRL16V100P-3X/G24Z4/M

0811404239 4WRL16V1-120M-3X/G24Z4/M

0811404237 4WRL16V1-200M-3X/G24K0/M-750

0811404236 4WRL16V1-120M-3X/G24K0/M-750

0811404234 4WRL16EZ180S-3X/G24Z4/M-763

0811404233 4WRL16EZ180S-3X/G24ETZ4/M-750

0811404232 4WRL16EZ180S-3X/G24Z4/M-750

0811404229 4WRL16V120M-3X/G24K0/M-750

0811404228 4WRL16E1-180S-3X/G24Z4/M-755

0811404223 4WRL16WZ180S-3X/G24EZ4/WX02M-753

0811404221 4WRL16V200M-3X/G24TZ4/M-765

0811404220 4WRL16Q5-200M-3X/G24TZ4/M-774

0811404219 4WRL16W3-180S-3X/G24Z4/WX02M-924

0811404218 4WRL16W180S-3X/G24ETZ4/WX02M-748

0811404216 4WRL16E1-110S-3X/G24Z4/M

0811404215 4WRL16E110S-3X/G24Z4/M

0811404214 4WRL16E4-180S-3X/G24Z4/M

0811404213 4WRL16W1Z180S-3X/G24Z4/M

0811404212 4WRL16E1Z180S-3X/G24Z4/M

0811404211 4WRL16W4Z180S-3X/G24Z4/M

0811404210 4WRL16EZ180S-3X/G24Z4/M

0811404209 4WRL16WZ180S-3X/G24Z4/M

0811404207 4WRL16V200M-3X/G24Z4/M

0811404206 4WRL16V120M-3X/G24Z4/M

0811404193 4WRL10W1-80S-3X/G24TZ4/M

0811404192 4WRL10E80S-3X/G24ETK0/M-750

0811404191 4WRL10E80S-3X/G24K0/M-750

0811404190 4WRL10E1-80S-3X/G24TZ4/M

0811404189 4WRL10E80S-3X/G24TZ4/M

0811404188 4WRL10W80S-3X/G24ETZ4/M

0811404187 4WRL10W4-80S-3X/G24Z4/M

0811404186 4WRL10E4-80S-3X/G24Z4/M

0811404185 4WRL10W1-80S-3X/G24ETZ4/M

0811404184 4WRL10W1-80S-3X/G24Z4/M

0811404183 4WRL10W80S-3X/G24Z4/M

0811404182 4WRL10E1-80S-3X/G24ETZ4/M

0811404181 4WRL10E1-80S-3X/G24Z4/M

0811404180 4WRL10E80S-3X/G24Z4/M

0811404179 4WRPH6C3B12L-2X/G24K0/M-784

0811404177 4WRPH6XB12L-2X/G24K0/M-843

0811404175 4WRPH6XB40L-2X/G24Z4/M-842

0811404174 4WRPH6C3B40L-2X/G24Z4/M-561

0811404172 4WRPH6CB25P-2X/G24Z4/M

0811404171 4WRPH6C4B40L-2X/G24K0/M-750

0811404170 4WRPH6C3B40L-2X/G24K0/M-750

0811404169 4WRPH6C3B24L-2X/G24K0/M-750

0811404167 4WRPH6C4B24L-2X/G24K0/M-750

0811404166 4WRPH6XB12L-2X/G24Z4/M-842

0811404164 4WRPH6C3B24L-2X/G24Z4/M-561

0811404163 4WRPH6XB24L-2X/G24Z4/M-842

0811404162 4WRPH6C1B40P-2X/G24Z4/M

0811404161 4WRPH6C3B12L-2X/G24Z4/M-561

0811404160 4WRPH6C4B04L-2X/G24Z4/M

0811404155 4WRBAE6W2-32J-2X/G24N9K31/A1M

0811404154 4WRBAE6E18J-2X/G24N9K31/F1M

0811404153 4WRBAE6W18J-2X/G24N9K31/A1M

0811404151 4WRBAE6E18J-2X/G24N9K31/A1M

0811404150 4WRBAE6E32J-2X/G24N9K31/A1M

0811404149 4WRPE6W2C32SJ-2X/G24K0/A1M-836

0811404148 4WRPE6E08SJ-2X/G24K0/A1M

0811404147 4WRPE6W32SJ-2X/G24K0/F1M

0811404146 4WRPE6W18SJ-2X/G24K0/F1M

0811404145 4WRPE6W08SJ-2X/G24K0/A1M

0811404144 4WRPE6W32SJ-2X/G24K0/B5M

0811404143 4WRPE6W32SJ-2X/G24K0/A1M

0811404142 4WRPE6W18SJ-2X/G24K0/A1M

0811404141 4WRPE6E32SJ-2X/G24K0/A1M

0811404140 4WRPE6E18SJ-2X/G24K0/A1M

0811404132 4WRPH6C3B04L-1X/G24Z4/V

0811404130 4WRPH6CB40L-2X/G24Z4/M-859

0811404129 4WRPH6CB40L-2X/G24Z4/M-855

0811404128 4WRPH6CB24L-2X/G24Z4/M-855

0811404126 4WRP6W06S-1X/G24Z4/M

0811404125 4WRBA6W07-2X/G24N9Z4/M

0811404124 4WRBA6W15-2X/G24N9Z4/M-897

0811404123 4WRBA6E07-2X/G24N9Z4/M

0811404122 4WRPH6C3B04L-1X/G24Z4/M

0811404121 4WRP6W28S-1X/G24Z4/M

0811404120 4WRP6W14S-1X/G24Z4/M

0811404118 4WRPH6C4B24L-1X/G24Z4/M

0811404117 4WRBA6W15-2X/G24N9Z4/M

0811404116 4WRBA6W30-2X/G24N9Z4/M

0811404115 4WRBA6E15-2X/G24N9Z4/M

0811404114 4WRBA6E30-2X/G24N9Z4/M

0811404113 4WRPH6C3B40L-1X/G24Z4/M

0811404112 4WRPH6C4B12L-1X/G24Z4/M

0811404111 4WRPH6C3B12L-1X/G24Z4/M

0811404106 4WRPH6C3B24L-1X/G24Z4/M

0811404104 4WRP6C3B02L-1X/G24Z4/M

0811404103 4WRP6W08S-1X/G24Z4/M-755

0811404102 4WRP6W16S-1X/G24Z4/M-755

0811404101 4WRP6E08S-1X/G24Z4/M-755

0811404100 4WRP6E16S-1X/G24Z4/M-755

0811404099 4WRL10V1-85M-3X/G24ETK0/M-750