一級代理力士樂REXROTH比例方向閥 力士樂Rexroth先導(dǎo)式比例方向閥：
型號 4WRKE 比例方向閥先導(dǎo)式
規(guī)格10至35
安裝面按ISO 4401
控制流量的方向和大小
通過3通比例方向閥進行先導(dǎo)控制，無位置反饋
主閥芯的彈簧對中
力士樂型號 4WRBKE 比例方向閥先導(dǎo)式，有集成電控器（OBE）電位置反饋
規(guī)格10至35
安裝面按ISO 4401
遮蓋補償，電子校準
通過3通比例方向閥進行先導(dǎo)控制，無位置反饋
主閥芯的彈簧對中 一級代理力士樂REXROTH比例方向閥 4WRKE25W8-350L-3X/6EG24ETK31/A5D3M
4WRKE16E125L-3X/6EG24EK31/A1D3M
4WRKE32W6-600L-3X/6EG24TK31/A1D3M
4WRKE10E100L-3X/6EG24EK31/A1D3M
4WRKE16E200L-3X/6EG24ETK31/A1D3M
4WRKE25W8-350L-3X/6EG24EK31/F1D3M
4WRKE10E50L-3X/6EG24EK31/A1D3M
4WRKE25R5-350L-3X/6EG24EK31/A1D3M-622
4WRKE16E1-200P-3X/6EG24K31/A5D3M
4WRKE16W1-200P-3X/6EG24EK31/A5D3M-706
4WRKE16W8-125L-3X/6EG24ETK31/F1D3M
4WRKE25W6-350L-3X/6EG24EK31/A1D3M
4WRKE10E50L-3X/6EG24ETK31/A1D3M
4WRKE16E200L-3X/6EG24EK31/A1D3M
4WRKE16E125L-3X/6EG24K31/A1D3M
4WRKE25E220S-3X/6EG24K31/A1D3M
4WRKE27W6-500L-3X/6EG24K31/A1D3M
4WRKE25E350L-3X/6EG24EK31/A1D3M
4WRKE32E600L-3X/6EG24K31/A1D3M
4WRKE25W8-220L-3X/6EG24EK31/F1D3M
4WRKE16W8-125L-3X/6EG24EK31/F1D3M
4WRKE16W8-200L-3X/6EG24EK31/F1D3M
4WRKE25E3-350L-3X/6EG24EK31/A1D3M
4WRKE25W8-220L-3X/6EG24ETK31/F1D3M
4WRKE35E1000L-3X/6EG24K31/A1D3M
4WRKE32W6-600L-3X/6EG24K31/A1D3M
4WRKE25E3-350P-3X/6EG24K31/A5D3M
4WRKE16W6-200L-3X/6EG24EK31/A1D3M
4WRKE16E1-200L-3X/6EG24K31/A5D3M
4WRKE25W6-220L-3X/6EG24EK31/A1D3M
4WRKE16R3-125L-3X/6EG24EK31/A1D3M
4WRKE16W6-200P-3X/6EG24EK31/A1D3M
4WRKE25W6-220L-3X/6EG24K31/A1D3M
4WRKE35E1000L-3X/6EG24K31/A1D3M-280
4WRKE16E125L-3X/6EG24K31/A1D3M-280
4WRKE25E350L-3X/6EG24K31/A1D3M-280
4WRKE32E600L-3X/6EG24EK31/A1D3M
4WRKE27W6-500L-3X/6EG24EK31/A1D3M
4WRKE16E3-125L-3X/6EG24K31/F1D3V
4WRKE16W8-125L-3X/6EG24ETK31/A1D3V
4WRKE25W8-220L-3X/6EG24ETK31/A1D3V
4WRKE16E200P-3X/6EG24EK31/A1D3M
4WRKE32W6-600L-3X/6EG24EK31/A1D3M
4WRKE16W6-200P-3X/6EG24EK31/F1D3M
4WRKE27E500L-3X/6EG24K31/A1D3M
4WRKE32W8-600L-3X/6EG24EK31/F1D3M
4WRKE27W8-500L-3X/6EG24ETK31/F1D3M
4WRKE10E1-50L-3X/6EG24K31/A1D3M
4WRKE10R3-50L-3X/6EG24ETK31/F1D3V
4WRKE10E25L-3X/6EG24EK31/A1D3M-280
4WRKE35W6-1000L-3X/6EG24K31/A1D3M
4WRKE10W8-100L-3X/6EG24K31/F1D3M
4WRKE10W8-100L-3X/6EG24EK31/F1D3M
4WRKE25W6-220L-3X/6EG24TK31/A1D3M
4WRKE25E1-220L-3X/6EG24K31/A1D3M-280
R901160405 4WRDE16V1-125L-5X/6L24TK9/M-280
R901147771 4WRDE25E1-220L-5X/6L24K9/M
R901102032 4WRDE16V1-200L-5X/6L24K9/V
R901047758 4WRDE25W1-350L-5X/6L24EK9/WG152M
R901047756 4WRDE10W1-100L-5X/6L24EK9/WG152M
R900702685 4WRDE16W1-200L-5X/6L24EK9/M
R900702612 4WRDE25V1-350L-5X/6L24EK9/WG152MR
R900699276 KOLBEN4WRDE25V350-41/
R900699274 KOLBEN4WRDE25W350-41/
R900699270 KOLBEN4WRDE16V200-41/
R900699269 KOLBEN4WRDE16W200-41/
R900699266 KOLBEN4WRDE10V100-41/
R900699265 KOLBEN4WRDE10V50-41/
R900699262 KOLBEN4WRDE10E100-41/
R900645078 KOLBEN4WRDE32W1-600-41/
R900639652 KOLBEN4WRDE16W125-41/
R900639275 KOLBEN4WRDE25W1/W2-500-41H/
R900639274 KOLBEN4WRDE25W500-41H/
R900637940 KOLBEN4WRDE10E1/E2-50-41/
R900634053 KOLBEN4WRDE16V125-40/
R900632108 KOLBEN4WRDE10W1/W2-100-40/
R900629797 KOLBEN4WRDE10E1/E2-100-40/
R900623685 FEDERLER4WRDE10.-40/
R900619532 4WRDE25V1-350L-5X/6L24K9/MR
R900617516 4WRDE16W5-200L-5X/6L24ETK9/WG152MR
R900555409 4WRDE10V100L-5X/6L15ETK9/MR
R900545419 GEHAEUSE4WRDE35E1000-41/
R901135024 4WRDE10V1-50L-5X/6L24K9/MR-280
R901134300 4WRDE16Q2-200P-5X/6L15K9/WG152MR
R901132087 4WRDE25V1-350L-5X/6L15K9/VR-280
R901131864 4WRDE16V125L-5X/6L24ETK9/WG152MR
R901131452 4WRDE25V350L-5X/6L15EK9/M
R901130863 4WRDE32V600L-5X/6L24K9/MR-576
R901130612 4WRDE16V200P-5X/6L24ETK9/MR-280
R901130572 4WRDE32E400L-5X/6L24EK9/MR
R901130248 4WRDE10V100S-5X/6L15ETK9/MR
R901129743 4WRDE32V600L-5X/6L24K9/MR-202
R901127196 4WRDE16V200P-5X/6L24K9/VR-576
R901127194 4WRDE10V100P-5X/6L24K9/VR-576
R901125441 4WRDE25V350L-5X/6L24K9/VR-576
R901125425 4WRDE16V125L-5X/6L24K9/V-576
R901122858 4WRDE32V600L-5X/6L24ETK9/MR
R901121801 4WRDE10V1-50L-5X/6L15K9/VR-280
R901120775 4WRDE25E3-350P-5X/6L24ETK9/WG152M
R901118086 4WRDE10V1-50S-5X/6L24K9/WG152MR
R901117439 4WRDE16E125L-5X/6L15EK9/WG152M
R901116616 4WRDE32V1-400L-5X/6L24K9/WG152MR
R901115253 4WRDE16V1-125S-5X/6L24K9/WG152MR
R901114170 4WRDE32V600L-5X/6L24K9/WG150MR-900
R901113536 4WRDE10V100R-5X/6L15EK9/MR
R901112269 4WRDE16W200L-5X/6L24ETK9/MR-280
R901111031 4WRDE25V220L-5X/6L24K9/M-576
R901105517 4WRDE25V350L-5X/6L15K9/VR-280
R901104990 4WRDE32W600L-5X/6L24K9/M
R901102032 4WRDE16V1-200L-5X/6L24K9/V
R901098903 4WRDE16W125L-5X/6L24ETK9/WG152M
R901097831 4WRDE10V50L-5X/6L15EK9/M-280
R901097630 4WRDE10V25L-5X/6L15K9/VR-280
R901096430 4WRDE16W200L-5X/6L24K9/WG152M
R901096284 4WRDE32V600L-5X/6L24K9/VR-881
R901095834 4WRDE10W1-100L-5X/6L24K9/V
R901095362 4WRDE25V220L-5X/6L15ETK9/WG152M
R901095318 4WRDE32W600L-5X/6L24K9/WG152M
R901094073 4WRDE10V1-100L-5X/6L24K9/V
R901093985 4WRDE16W200L-5X/6L24EK9/M
R901092003 4WRDE10V50L-5X/6L24EK9/MR
R901089060 4WRDE10E50P-5X/6L24K9/MR
R901085389 4WRDE25V220L-5X=6L15ETK9/WG152M
R901085388 4WRDE16V125L-5X=6L15ETK9/M
R901085364 4WRDE16W1-200L-5X/6L24TK9/M
R901083593 4WRDE25V350P-5X/6L24K9/MR
R901082785 4WRDE16V125P-5X/6L24TK9/M
R901079991 4WRDE27W500L-5X/6L24K9/MR-280
R901079988 4WRDE16W1-125L-5X/6L24K9/MR-280
R901079986 4WRDE16W1-200L-5X/6L24K9/MR-280
R901079949 4WRDE25V000S-5X/6L15K9/VR-469
R901079507 4WRDE25E1-350L-5X/6L24K9/WG152MR
R901079142 4WRDE27W1-500P-5X/6L24K9/WG152MR
R901078593 4WRDE16E1-125L-5X/6L24ETK9/WG152MR
R901078127 4WRDE10V1-100P-5X/6L24TK9/MR
R901075852 4WRDE25V220L-5X/6L24TK9/WG152M-280
R901075442 4WRDE16V125L-5X/6L24TK9/M-280
R901074358 4WRDE16V125L-5X/6L24ETK9/M-280
R901074350 4WRDE32V400L-5X/6L24K9/MR
R901072877 4WRDE10V50L-5X/6L24TK9/MR-280
R901072551 4WRDE16V125L-5X/6L24TK9/V
R901070226 4WRDE32V400L-5X/6L24K9/WG152MR
R901068907 4WRDE10V25L-5X/6L24TK9/M
R901068457 4WRDE25V220L-5X/6L15K9/MR-881
R901067986 4WRDE32E600L-5X/6L24K9/M
R901067238 4WRDE16V125L-5X/6L24ETK9/MR
R901065914 4WRDE10E100L-5X/6L24EK9/M-280
R901064065 4WRDE27W500L-5X/6L24K9/M
R901064064 4WRDE16W1-200L-5X/6L24K9/M
R901064061 4WRDE25V1-350L-5X/6L24K9/M
R901063828 4WRDE16E1-125L-5X/6L24K9/WG152M
R901063272 4WRDE10V50L-5X/6L24ETK9/MR-202
R901062725 4WRDE32V400L-5X/6L24K9/MR-280
R901061080 4WRDE25V220L-5X/6L24ETK9/M-576
R901052545 4WRDE16V200L-5X/6L24TK9/MR-280
R901050179 4WRDE10V1-50L-5X/6L24ETK9/M-280
R901049339 4WRDE16V1-125L-5X/6L24K9/WG152MR
R901048599 4WRDE16E125P-5X/6L24ETK9/M-280
R901047780 4WRDE10V50L-5X/6L24TK9/V
R901047758 4WRDE25W1-350L-5X/6L24EK9/WG152M
R901047756 4WRDE10W1-100L-5X/6L24EK9/WG152M
R901030042 4WRDE25V350L-5X/6L15ETK9/VR
R901026319 4WRDE10E100L-5X/6L24TK9/WG152M
R901025630 4WRDE25E350S-5X/6L24K9/M-280
R901027139 4WRDE25V350S-5X/6L24EK9/M
R901024133 4WRDE10V50L-5X/6L24ETK9/MR-280
R901023490 4WRDE16V1-200L-5X/6L24ETK9/M-280
R901023038 4WRDE32V1-600L-5X/6L24K9/WG152M
R901020022 4WRDE10V50L-5X/6L24K9/MR-280
R901019798 4WRDE10E100L-5X/6L24K9/WG152M
R901014735 4WRDE25V350P-5X/6L15K9/M
R901006764 4WRDE10V50L-5X/6L15TK9/MR
R900979800 4WRDE16V125L-5X/6L15ETK9/M
R900979616 4WRDE10W1-100L-5X/6L24K9/M
R900978574 4WRDE10V1-50P-5X/6L24ETK9/M
R900978379 4WRDE10V100L-5X/6L24ETK9/MR
R900978347 4WRDE10V50L-5X/6L24TK9/M
R900978280 4WRDE25V350L-5X/6L24K9/MR
R900977457 4WRDE16E125L-5X/6L24K9/WG152M
R900977162 4WRDE10V50P-5X/6L24ETK9/MR-202
R900976154 4WRDE16V1-200P-5X/6L24K9/MR
R900975626 4WRDE25E220L-5X/6L24K9/M
R900975600 4WRDE10V50L-5X/6L24K9/MR-202
R900975265 4WRDE16V125L-5X/6L24K9/VR-202
R900975009 4WRDE10V100L-5X/6L24K9/VR
R900974146 4WRDE35E1000P-5X/6L15K9/M
R900973360 4WRDE16V125L-5X/6L24K9/MR-202
R900973309 4WRDE16V1-125L-5X/6L24K9/M
R900971441 4WRDE10V50L-5X/6L24K9/M-280
R900971418 4WRDE10V100L-5X/6L24K9/MR-202
R900971342 4WRDE27V500L-5X/6L24K9/M
R900971284 4WRDE16V125L-5X/6L24TK9/M
R900971202 4WRDE27Q2-500P-5X/6L24K9/WG152MR
R900970880 4WRDE25V350P-5X/6L24K9/M
R900970846 4WRDE10W50L-5X/6L15EK9/M-280
R900970845 4WRDE10V50L-5X/6L15K9/M-280
R900970729 4WRDE25V350L-5X/6L24EK9/M
R900970576 4WRDE10V1-100L-5X/6L24K9/MR
R900970131 4WRDE10Q2-100P-5X/6L24K9/WG152MR
R900970066 4WRDE10V25L-5X/6L24K9/M
R900969670 4WRDE10V100L-5X/6L24K9/MR-280
R900969611 4WRDE25E350L-5X/6L15K9/M
R900969061 4WRDE16V200L-5X/6L24K9/MR-202
R900969051 4WRDE10V50L-5X/6L15ETK9/M
R900968714 4WRDE35E1000P-5X/6L24K9/M
R900968423 4WRDE16V000S-5X/6L15K9/WG152M-488
R900968197 4WRDE10W50P-5X/6L24K9/MR-280
R900968194 4WRDE16V125P-5X/6L24K9/MR-280
R900967620 4WRDE10V50P-5X/6L24K9/M
R900967608 4WRDE10V100P-5X/6L24K9/WG152MR-478
R900967553 4WRDE10V100L-5X/6L15K9/MR
R900967049 4WRDE16V1-200L-5X/6L24ETK9/MR
R900966882 4WRDE32V600L-5X/6L24K9/MR-280
R900966563 4WRDE10V100L-5X/6L24K9/MR
R900966154 4WRDE16V1-125S-5X/6L15K9/WG152M-259
R900965991 4WRDE16W3-200P-5X/6L24K9/WG152MR
R900965671 4WRDE27E500P-5X/6L15K9/M
R900965596 4WRDE16V200L-5X/6L24TK9/WG152MR
R900965420 4WRDE16E200L-5X/6L24K9/WG152MR
R900965411 4WRDE10V25L-5X/6L24ETK9/MR
R900965242 4WRDE10V50L-5X/6L24EK9/M
R900965189 4WRDE32X600P-5X/6L24K9/V-317
R900965139 4WRDE25V1-350L-5X/6L24K9/MR-280
R900964881 4WRDE16V125P-5X/6L24K9/WG152V
R900964878 4WRDE16V1-200P-5X/6L24K9/WG152VR
R900964876 4WRDE16V1-125P-5X/6L24K9/WG152V
R900964740 4WRDE25V350L-5X/6L15K9/MR-280
R900964392 4WRDE10V25L-5X/6L15K9/MR
R900964258 4WRDE10V1-100L-5X/6L24K9/WG152MR
R900964249 4WRDE16V200L-5X/6L24K9/WG152MR
R900964182 4WRDE25E350P-5X/6L24K9/M
R900963959 4WRDE16W1-125L-5X/6L24K9/M
R900963761 4WRDE10V50L-5X/6L15K9/MR
R900963754 4WRDE16E1-200L-5X/6L24K9/WG082M-478
R900963322 4WRDE10V100L-5X/6L15ETK9/M
R900962952 4WRDE10Q2-100P-5X/6L24K9/MR
R900962868 4WRDE16E125L-5X/6L24TK9/WG152MR
R900962823 4WRDE10V100L-5X/6L24TK9/WG152M
R900962577 4WRDE16V1-125L-5X/6L15K9/MR
R900962078 4WRDE25V350L-5X/6L24K9/WG152MR
R900961518 4WRDE25V350L-5X/6L24K9/MR-202
R900961105 4WRDE16E125L-5X/6L24K9/MR
R900961013 4WRDE10V25L-5X/6L24ETK9/WG152MR
R900960824 4WRDE16V1-200L-5X/6L24K9/WG152MR
R900960820 4WRDE16V200L-5X/6L24K9/VR
R900960819 4WRDE16V125L-5X/6L24K9/VR
R900960616 4WRDE16V200L-5X/6L15K9/MR-280
R900960357 4WRDE10V25L-5X/6L24K9/MR-280
R900960138 4WRDE16V125L-5X/6L24TK9/WG152MR
R900960137 4WRDE10V1-50L-5X/6L24EK9/M
R900959726 4WRDE10V25L-5X/6L24K9/MR-202
R900959699 4WRDE16V125L-5X/6L24K9/MR
R900959564 4WRDE16V125L-5X/6L24K9/M-202
R900959510 4WRDE16V125L-5X/6L15K9/M-280
R900959397 4WRDE10V1-100L-5X/6L24ETK9/M
R900959210 4WRDE25V220L-5X/6L24K9/MR
R900959029 4WRDE16Q2-200P-5X/6L24K9/WG152MR
R900958937 4WRDE16V000S-5X/6L15K9/WG152M-489
R900958681 4WRDE16V000S-5X/6L24K9/WG152M-488
R900958444 4WRDE32E3-600L-5X/6L24K9/WG152MR
R900958052 4WRDE16V200P-5X/6L24K9/MR
R900958017 4WRDE32V600P-5X/6L15K9/M
R900957581 4WRDE16V200L-5X/6L24K9/MR
R900957525 4WRDE16V125L-5X/6L24K9/WG152MR
R900957419 4WRDE16V1-200L-5X/6L24K9/MR
R900956902 4WRDE32V1-600L-5X/6L24K9/WG152MR
R900956672 4WRDE16E125P-5X/6L24EK9/M
R900956578 4WRDE10V50P-5X/6L15K9/WG152M
R900956352 4WRDE16E200L-5X/6L24K9/MR
R900956023 4WRDE16V1-200L-5X/6L24K9/MR-280
R900955792 4WRDE25V1-350L-5X/6L24K9/WG152MR
R900955582 4WRDE16V125L-5X/6L24K9/WG152MR-478
R900954449 4WRDE25V350L-5X/6L24K9/VR
R900954192 4WRDE32V600L-5X/6L24K9/WG152M
R900954191 4WRDE32V600L-5X/6L24ETK9/WG152M
R900954190 4WRDE32V600L-5X/6L24K9/M
R900954189 4WRDE25V1-350L-5X/6L24K9/WG152M
R900954188 4WRDE25V350L-5X/6L24ETK9/WG152M
R900954186 4WRDE25V350L-5X/6L24K9/M
R900954185 4WRDE25V350L-5X/6L24ETK9/M
R900954184 4WRDE25V220L-5X/6L24K9/WG152M
R900954183 4WRDE25V220L-5X/6L24K9/M
R900954182 4WRDE25V220L-5X/6L24ETK9/M
R900954181 4WRDE16V1-200L-5X/6L24K9/WG152M
R900954180 4WRDE16V1-125L-5X/6L24ETK9/WG152M
R900954179 4WRDE16V200L-5X/6L24K9/WG152M
R900954178 4WRDE16V200L-5X/6L24ETK9/WG152M
R900954177 4WRDE16V200L-5X/6L24K9/M
R900954176 4WRDE16V200L-5X/6L24ETK9/M
R900954175 4WRDE16V125L-5X/6L24K9/WG152M
R900954174 4WRDE16V125L-5X/6L24ETK9/WG152M
R900954172 4WRDE16V125L-5X/6L24ETK9/M
R900954171 4WRDE10V1-100L-5X/6L24K9/WG152M
R900954170 4WRDE10V1-50L-5X/6L24ETK9/WG152M
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REXROTH比例方向閥是一種直觀簡便的流量調(diào)節(jié)控制裝置，管網(wǎng)中應(yīng)用此閥可直接根據(jù)設(shè)計來設(shè)定流量，閥門可在水作用下，自動消除管線的剩余壓頭及壓力波動所引起的流量偏差，無論系統(tǒng)壓力怎樣變化均保持設(shè)定流量不變，該閥這些功能使管網(wǎng)流量調(diào)節(jié)一次完成，把調(diào)網(wǎng)工作變?yōu)楹唵蔚牧髁糠峙洌行У慕鉀Q管網(wǎng)的水力失調(diào)。REXROTH比例方向閥主要應(yīng)用于：集中供熱（冷）等水系統(tǒng)中，使管網(wǎng)流量按需分配，消除水系統(tǒng)水力失調(diào)，解決冷熱不均問題，可節(jié)能、節(jié)電15%-20%。
REXROTH比例方向閥從結(jié)構(gòu)上說，是一個雙閥組合，即由一個手動調(diào)節(jié)閥組和自動平衡閥組組成，手動調(diào)節(jié)閥組的作用是設(shè)定流量，自動平衡閥組的作用是維持流量恒定。
對于手動調(diào)節(jié)閥組來說，流量G=Kv（P2-P3）,Kv的大小取決于開度，開度不變，則流量G不變，而P2-P3的恒定是由自動平衡閥組控制的。比如進出口壓差P1-P3增大，則通過感壓膜和彈簧的作用使自動平衡閥組關(guān)小，使P1-P2增大，從而維持P2-P3的恒定；反之P1-P3減小，則自動平衡閥組開大，使P1-P2減小，從而維持P2-P3的恒定。既在管網(wǎng)壓力變化時，自動閥芯就會在壓力的作用下自動開大或關(guān)小閥口來維持設(shè)定流量數(shù)值不變。手動調(diào)節(jié)閥組的每一個開度對應(yīng)一個流量，開度和流量的關(guān)系由試驗臺試驗標定，并配有開度的顯示和鎖定裝置。 REXROTH比例方向閥是在一定壓力差下，依靠改變節(jié)流口液阻的大小來控制節(jié)流口的流量，從而調(diào)節(jié)執(zhí)行元件（液壓缸或液壓馬達）運動速度的閥類。
REXROTH比例方向閥主要包括節(jié)流閥、調(diào)速閥、溢流節(jié)流閥和分流集流閥等。此閥一般水平安裝
REXROTH比例方向閥產(chǎn)品特點：
REXROTH比例方向閥又稱400X比例方向閥,是一種采用高精度先導(dǎo)方式控制流量的多功能閥門。適用于配水管需控制流量和壓力的管路中，保持預(yù)定流量不變，將過大流量限制在一個預(yù)定值，并將上游高壓適當減低，即使主閥上游的壓力發(fā)生變化，也不會影響主閥下游的流量。 REXROTH比例方向閥原理
1、一改常規(guī)節(jié)流閥使用孔板或純機械的減小流域面積的原理，利用相關(guān)導(dǎo)閥，zui大限度地減小能量在節(jié)流過程中的損失
2、控制靈敏度高，安全可靠，調(diào)試簡便，使用壽命長。
REXRITG比例方向閥可在沒有外接電源的情況下，自動實現(xiàn)系統(tǒng)的流量平衡。是通過保持孔板（固定孔徑）前后壓差一定而實現(xiàn)流量限定的，因此，也可稱定流量閥。
定流量閥作用對象是流量，能夠鎖定流經(jīng)閥門的水量，而不是針對阻力的平衡。他能夠解決系統(tǒng)的動態(tài)失調(diào)問題：為了保持單臺制冷機、鍋爐、冷卻塔、換熱器這些設(shè)備的高效率運行，就需要控制這些設(shè)備流量固定于額定值；從系統(tǒng)末端來看，為了避免動態(tài)調(diào)節(jié)的相互影響，也需要在末端裝置或分支處限制流量。 在設(shè)計中應(yīng)注意的問題，流量控制閥的缺點是在于閥門有zui小工作差的要求，一般產(chǎn)品要求zui小工作壓差20KPa，如果安裝在zui不利回路上，勢必要求循環(huán)水泵多增加2米水柱的工作揚程，所以應(yīng)采取近端安裝，遠端不安的方法。
1）按照氣體在管道的流動方向，如果只允許氣體向一個方向流動，這樣的閥叫做單向型控制閥，比如單向閥，梭閥等；可以改變氣體流向的控制閥叫做換向閥，比如常用的2way2port，2way3port，2way5port，3way5port等。
2）按照控制方式可分為電磁閥，機械閥，氣控閥，人控閥。其中電磁閥又可以分為單和雙電控閥兩種；機械閥可分為球頭閥，滾輪閥等多種；氣控閥也可分為單氣控和雙氣控閥；人力閥
可以分為手動閥，腳踏閥兩種。
3）按工作原理可以分為直動閥和先導(dǎo)閥，直動閥就是靠人力或者電磁力，氣動力直接實現(xiàn)換向要求的閥；先導(dǎo)閥是由先導(dǎo)頭和閥主體2部分構(gòu)成，有先導(dǎo)頭活塞驅(qū)動閥主體里面的閥桿實現(xiàn)換向。
4）根據(jù)換向閥桿的工作位置可以將閥分為2way，3way閥。
5）根據(jù)閥上氣孔的多少來進行劃分，可以分為2port，3port，5port閥。 REXROTH比例方向閥無需輔助能源，簡單可靠。常用的有減壓閥、溢流閥、壓差控制閥、溫度控制閥等。各種不同的控制系統(tǒng)達到*的控制效果需要對控制參數(shù)進行*化。高階控制系統(tǒng)中zui主要的影響參數(shù)是滯后時間（Tu），因為測量單元需要一段時間來辨識輸入信號或干擾信號。現(xiàn)代微處理技術(shù)極大地幫助了我們，問題大大簡化。在輸入實測值的模擬量后，信號被轉(zhuǎn)換為數(shù)字信號。數(shù)字信號的處理時間大大縮短且信號可*再現(xiàn)。設(shè)定值和實際值比的差值也是數(shù)字量，即偏差Dw，偏差又轉(zhuǎn)換為相應(yīng)的控制信號傳給控制閥。控制參數(shù)的自適應(yīng)調(diào)整由微處理器完成。經(jīng)過數(shù)次循環(huán)調(diào)節(jié)后，控制器辨識出滯后時間（Tu）并對控制參數(shù)自動調(diào)節(jié)，從而減小Tu的影響。 REXROTH比例方向閥和電動、氣動執(zhí)行閥均配有相應(yīng)的傳感器（如壓力、溫度傳感器）。我們的許多傳感器，尤其是用于溫度和壓力自力式控制閥的傳感器，性能**，可提供特殊的解決方案！
REXROTH比例方向閥是由手動調(diào)節(jié)部分和自動調(diào)節(jié)部分（自力式壓差控制閥）組成。手動調(diào)節(jié)部分設(shè)定每一個開度對應(yīng)一個Kv值，由自動調(diào)節(jié)部分（自力式壓差控制閥）控制手動調(diào)節(jié)部分的前后壓差不變。
REXROTH比例方向閥的基本定義：在一定的壓差范圍內(nèi)，恒定被控系統(tǒng)的流量，作用對象是系統(tǒng)的流量。當外網(wǎng)壓力波動時被控系統(tǒng)不受影響。
REXROTH比例方向閥應(yīng)用：
1、適用于大型的熱力管網(wǎng)上是流量分配變得簡單快捷。
2、適用于逐年并網(wǎng)的系統(tǒng)，新系統(tǒng)地加入不影響原來的系統(tǒng)。
3、適用于風(fēng)機盤管和空氣處理機冷卻機、冷水機、冷卻塔等設(shè)備的定流量運行。
4、單管跨越式系統(tǒng)的立管的流量控制。 
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