力士樂Rexroth先導式比例方向閥：
型號 4WRKE 比例方向閥先導式
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控制，無位置反饋
主閥芯的彈簧對中
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)中應用此閥可直接根據(jù)設計來設定流量，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?，有效的解決管網(wǎng)的水力失調(diào)。REXROTH比例方向閥主要應用于：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小閥口來維持設定流量數(shù)值不變。手動調(diào)節(jié)閥組的每一個開度對應一個流量，開度和流量的關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，保持預定流量不變，將過大流量限制在一個預定值，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，利用相關導閥，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、換熱器這些設備的高效率運行，就需要控制這些設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。
在設計中應注意的問題，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；先導閥是由先導頭和閥主體2部分構(gòu)成，有先導頭活塞驅(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?，F(xiàn)代微處理技術極大地幫助了我們，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)換為相應的控制信號傳給控制閥?？刂茀?shù)的自適應調(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)部分設定每一個開度對應一個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、適用于風機盤管和空氣處理機冷卻機、冷水機、冷卻塔等設備的定流量運行。
4、單管跨越式系統(tǒng)的立管的流量控制。
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