力士乐液控单向阀SL20PB4-4X/，德国REXROTH全新原装进口，质量保证，现货特价供应；

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​止回阀用途广泛，有很多种类，下面说的是供水和热力常用的止回阀：
1、弹簧式：液体由下而上，依靠压力顶起弹簧控制的阀瓣，压力消失后，弹簧力将阀瓣压下，封闭液体倒流。常用于通径较小的止回阀。
2、重力式：和弹簧式相似，依靠阀瓣的自身重力封闭，防止倒流。
3、旋启式：液体在阀体内直通，依靠压力顶开一侧的旋转阀瓣，压力失去后，阀瓣依靠自重回位，反向的液体压力封闭阀瓣。
4.塑料隔膜式: 外壳和隔膜均为塑料.一般外壳为ABS,PE,PP,NYLON, PC.隔膜有硅树脂,氟树脂等。
其它的单向阀（止回阀），如排污的止回阀，人防的防爆阀和液体使用的止回阀的原理是大同小异。​

力士乐液控单向阀SL20PB4-4X/

力士乐单向阀 R901086600 Z1S 6 P05-4X/V SO68 
力士乐单向阀 R901086601 Z1S 6 P05-4X/V SO90 
力士乐单向阀 R901086597 Z1S 6 P05-4X/V SO2 
力士乐单向阀 R901112643 Z1S 6 P05-4X/V/62 
力士乐单向阀 R901115403 Z1S 6 P05-4X/V/62 SO68 
力士乐单向阀 R901104197 Z1S 6 P15-4X/V 
力士乐单向阀 R901086052 Z1S 6 P30-4X/V 
力士乐单向阀 R901086610 Z1S 6 P30-4X/V SO68 
力士乐单向阀 R901086613 Z1S 6 P30-4X/V SO90 
力士乐单向阀 R901086055 Z1S 6 P50-4X/V 
力士乐单向阀 R901086058 Z1S 6 T05-4X/V 
力士乐单向阀 R901107146 Z1S 6 T05-4X/V/62 
力士乐单向阀 R901124305 Z1S 6 T15-4X/V 
力士乐单向阀 R901086059 Z1S 6 T30-4X/V 
力士乐单向阀 R901086060 Z1S 6 T50-4X/V 
力士乐单向阀 R900564519 Z2SRK 6-1-1X/V/60 
力士乐单向阀 R900564520 Z2SRK 10-1-1X/V 
力士乐单向阀 R900347495 Z2S 6-1-6X/ 
力士乐单向阀 R900347504 Z2S 6-1-6X/V 
力士乐单向阀 R900347496 Z2S 6-2-6X/ 
力士乐单向阀 R900347505 Z2S 6-2-6X/V 
力士乐单向阀 R900347497 Z2S 6-3-6X/ 
力士乐单向阀 R900347506 Z2S 6-3-6X/V 
力士乐单向阀 R900347498 Z2S 6A1-6X/ 
力士乐单向阀 R900347507 Z2S 6A1-6X/V 
力士乐单向阀 R900347499 Z2S 6A2-6X/ 
力士乐单向阀 R900347508 Z2S 6A2-6X/V 
力士乐单向阀 R900347500 Z2S 6A3-6X/ 
力士乐单向阀 R900347509 Z2S 6A3-6X/V 
力士乐单向阀 R900347501 Z2S 6B1-6X/ 
力士乐单向阀 R900347510 Z2S 6B1-6X/V 
力士乐单向阀 R900347502 Z2S 6B2-6X/ 
力士乐单向阀 R900347511 Z2S 6B2-6X/V 
力士乐单向阀 R900347503 Z2S 6B3-6X/ 
力士乐单向阀 R900347512 Z2S 6B3-6X/V 
力士乐单向阀 R901129841 Z2S 6-1-6X//60 
力士乐单向阀 R900727969 Z2S 6-1-6X//62 
力士乐单向阀 R900747681 Z2S 6-1-6X/V/62 
力士乐单向阀 R901154311 Z2S 6-2-6X//62 
力士乐单向阀 R901107246 Z2S 6A1-6X//62 
力士乐单向阀 R901170210 Z2S 6A1-6X/V/60 
力士乐单向阀 R901126655 Z2S 6A1-6X/V/62 
力士乐单向阀 R900739494 Z2S 6A2-6X//62 
力士乐单向阀 R901107241 Z2S 6B1-6X//62 ​

力士乐液控单向阀SL20PB4-4X/

稳压作用：溢流阀串联在回油路上，溢流阀产生背压，运动部件平稳性增加。
系统卸荷作用：在溢流阀的遥控口串接溢小流量的电磁阀，当电磁铁通电时，溢流阀的遥控口通油箱，此时液压泵卸荷。溢流阀此时作为卸荷阀使用。
安全保护作用：系统正常工作时，阀门关闭。只有负载超过规定的极限（系统压力超过调定压力）时开启溢流，进行过载保护，使系统压力不再增加（通常使溢流阀的调定压力比系统最高工作压力高10%～20%）。
实际应用中一般有：作卸荷阀用，作远程调压阀，作高低压多级控制阀，作顺序阀，用于产生背压（串在回油路上）。​

力士乐液控单向阀SL20PB4-4X/

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R900921254 P3V7/16-20C0+V7/10-14C0+V7/10-14C0RE0 *A
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R900921667 DBW 20 B2-5X/315-6EG24N9K4V
R900921685 E-LCW 32 C20D1X/
R900921712 MH3DRD 02 K0-1X/040-1V
R900921713 MH3DRD 02 K0-1X/018-1M
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R900921753 DR3U 10 D6-5X/100Y6EG24N9K4
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R900921757 DBW 20 A2-5X/350S6EW110N9K4R12
R900921780 4WE 10 V3X/CG24N9K4​

力士乐液控单向阀SL20PB4-4X/

减压阀基本性能
(1)调压范围：它是指减压阀输出压力P2的可调范围，在此范围内要求达到规定的精度。调压范围主要与调压弹簧的刚度有关。
(2)压力特性：它是指流量g为定值时，因输入压力波动而引起输出压力波动的特性。输出压力波动越小，减压阀的特性越好。输出压力必须低于输入压力—定值才基本上不随输入压力变化而变化。
(3)流量特性：它是指输入压力—定时，输出压力随输出流量g的变化而变化的持性。当流量g发生变化时，输出压力的变化越小越好。一般输出压力越低，它随输出流量的变化波动就越小。​

力士乐液控单向阀SL20PB4-4X/

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R900921799 ZDREE 10 VP2-1X/100XLMG24K31M
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R900921822 4WE 6 PB6X/EW230N9K4
R900921827 4WEH 10 J4X/6EW110N9ES2K4
R900921832 H-4WEH 25 J6X/6EW110N9ES2K4
R900921833 4WEH 10 J4X/6EW110N9EK4
R900921834 4WEH 32 J6X/6EW110N9EK4
R900921835 4WEH 22 D7X/6EW110N9EK4
R900921838 4WEH 22 J7X/6EW110N9EK4
R900921841 H-4WEH 25 J6X/6EW110N9EK4
R900921842 4WEH 10 E4X/6EW110N9EK4
R900921843 Z4WEH 16 E63-5X/6EG24N9ETK4QMAG24
R900921848 DBW 20 BG2-5X/350YU6EG12NK4
R900921849 DBW 20 BG2-5X/350YU6EG24NK4
R900921853 DBW 30 A2-5X/315-6EG24N9K4
R900921854 4WEH 22 J7X/6EW110N9ETSK4
R900921856 4WEH 22 HD7X/6EW230N9ETK4
R900921868 LFA 16 GWA-7X/A15
R900921886 MH2FANR 18 DA4X/1HA15V11-303
R900921892 4WE 6 GA6X/EG24N9K4/V SO407
R900921894 4WEH 22 G7X/6EW230N9ES2K4/P4,5
R900921896 4WEH 22 HD7X/OF6EW230N9K4
R900921899 DBW 30 BG2-5X/315Y6EG24N9K4/12
R900921909 VT 11124-1X/
R900921910 4WEH 10 U10B4X/6EG24K4QM0G24
R900921912 4WE 10 D3X/OFCG110N9K4
R900921913 4WEH 22 HD7X/OF6EW110N9ETSDL SO58
R900921923 1TH 7 QL05-1X/M01
R900921989 5-4WE 10 D3X/CG24K4QMBG24
R900921990 4WE 6 D6X/OFEG125N9K4
R900921992 4WE 6 EB6X/EG12N9K4
R900921993 4WE 6 X12B6X/EG24N9K4
R900922003 4WEH 22 J7X/6EW230N9ETDKL
R900922004 4WE 6 J73-6X/EG24N9K4/A12V
R900922006 H-4WEH 32 G6X/6EW230N9K4
R900922009 3WE 6 A6X/EG12N9K4
R900922010 H-4WEH 22 D7X/6EG24N9S2K4
R900922011 H-4WEH 22 E7X/6EG24N9S2K4
R900922013 4WE 6 G6X/EG125N9K4
R900922029 LC 16 A20D7X/A08
R900922030 LFA 16 WECA-7X/A12B10
R900922037 DBW 20 B2-5X/350S6EG24N9K4R12
R900922038 DBW 10 BG2-5X/200-6EW230N9K4
R900922054 DBW 30 B2-5X/100-6SMG24N9K4 SO631
R900922055 4WE 6 J6X/EW230N9DKL
R900922073 LFA 25 EWMA24-7X/CA20DQMG24
R900922074 LFA 25 EWMA37-7X/CA20DQMG24
R900922075 DBW 10 B2-5X/315-6EG24N9K4QMAG24
R900922076 4WE 10 L25-3X/CG24N9K4
R900922079 4WEH 16 HD7X/6EG24N9ETK4
R900922081 4WEH 16 C7X/6EG24N9ETK4
R900922083 4WEH 16 D7X/6EG24N9ETK4
R900922084 4WEH 16 E7X/6EG24N9ETK4
R900922085 4WEH 16 J7X/6EG24N9ETK4
R900922086 4WEH 32 J6X/6EW110N9ES2K4
R900922090 4WE 10 G73A3X/CG24N9K4
R900922091 4WE 6 H73-6X/EG96N9K4/A12
R900922137 4WSE2ED10-5X/30B13T210K31EV
R900922153 DBW 10 B2-5X/315-6EG205N9K4
R900922165 ABHAG-0150SSO/V7-16/112M/NS /S02H326A
R900922177 ABHPG-AZPF-004C20/100L-SO-125V/A11K467A2
R900922198 DBWT B2-5X/315-6EG24N9K4
R900922199 DBWT B3-5X/200-6EG24N9K4
R900922200 4WE 6 D6X/OFEG24N9DKL
R900922201 4WEH 22 J7X/6EW230N9TSK4 SO58
R900922203 H-4WEH 22 J7X/6EW110N9ETS2K4
R900922205 4WE 6 E6X/EW230N9K4/V
R900922206 4WE 6 Y6X/EW230N9K4/V
R900922207 4WE 6 J6X/EG220N9K4
R900922208 4WE 6 C6X/OFEG220N9K4
R900922209 Z4WEH 10 E51-4X/6EG220N9ETK4
R900922210 4WEH 10 D4X/6EG24N9ETK4QMBG24/B10
R900922211 4WE 6 R73-6X/EG24N9K4/A12
R900922212 4WE 6 UA6X/EG24N9K4/T06
R900922241 4WRZ 16 E1-100-6X/6AG24NK4/M
R900922272 MH2DAD 03 G2-1X/100-070M02
R900922277 4WEH22D7X/6EW110N9S2K4
R900922281 H-4WEH 25 HJ6X/6EW110N9K4/B08
R900922282 4WEH 10 M4X/6EG48N9K4
R900922283 H-4WEH 32 HL6X/6EW110N9S2K4
R900922287 4WEH 22 HD7X/OF6EG24N9ETS2K4
R900922288 H-4WEH 25 J6X/6EG24N9TS2K4/12B10
R900922289 4WEH 22 H7X/6EW230N9ETK4
R900922290 H-4WEH25H6X/6EW230N9ETK4
R900922308 DBW 20 B2-5X/100-6EG24N9K4
R900922310 DBW 30 B2-5X/100-6EG24N9K4
R900922311 DBW 30 B2-5X/315-6EG24N9K4
R900922316 4WE 6 JA6X/EG220N9K4
R900922326 4WRZ 16 W100-6X/6AG24N9EK4/M
R900922335 4WE 6 Y6X/EG220N9K4
R900922336 4WRZ 16 E150-6X/6AG24N9K4/M
R900922360 4WRGE 16 V125L-1X/210G24TK31/A1M
R900922369 4WE 6 M6X/EW110N9K4/B08
R900922370 HSZ 10 A214-3X/AS100-BS100M01
R900922375 4WE 6 M6X/EW230N9K4
R900922377 DBW 10 A2-5X/315-6EW230N9K4
R900922382 HSZ 06 A085-3X/P00M00
R900922387 4WE 6 Y6X/EG96N9K4/V
R900922434 4WRZ 10 E1-25-5X/6A24NETK4/D3M
R900922439 4WRAE 10 W30-2X/G24N9K31/F1V
R900922440 DBET-5X/400G24K4M-8
R900922441 4WRA 10 W30-2X/G24N9K4/V
R900922450 4WE 6 X10-6X/EG24N9K4
R900922452 4WS2EM10-4X/10B2T315K8DM
R900922458 3WE 6 A9-6X/EW110N9K4
R900922462 4WEH 22 E7X/6EG24N9S2K4
R900922463 4WE 10 D3X/CG24N9K4/T12 SO99
R900922465 4WE 10 D3X/CG24N9K4/B12MH
R900922466 H-4WEH 25 D6X/6EG24N9ETK4QMBG24
R900922469 LFA 16 D-7X/FX12
R900922472 4WE 6 E73-6X/EG12N9K4/A12
R900922475 DBW 20 B2-5X/350-6EG24N9K4 SO160
R900922476 LFA 25 D-7X/FX12
R900922477 LFA 25 D-7X/FX20
R900922479 DBW 30 B2-5X/100-6EW230N9K4
R900922482 LFA 25 E15-7X/CD40DQMG24FX10
R900922484 LFA 25 WEA-7X/A10P10T10
R900922486 HSZ 10 B061-3X/M00
R900922509 H-4WEH 25 J6X/6EG24N9ESK4/10B12
R900922521 LFA 16 H1-7X/FX08
R900922526 4WRZ 10 E1-25-5X/6A24NK4/M
R900922528 4WRZ 16 E150-6X/6AG24NEK4/M
R900922533 4WE 6 FB6X/EG24N9K4
R900922534 4WE 6 D6X/OFEG24N9K4/B20
R900922535 4WE 6 J6X/EG24N9K4/B20
R900922537 4WE 6 J6X/EW110N9K4/B08V
R900922538 3DR3U 10 DP5-6X/315Y6EG24N9K4/00M
R900922540 DBW 20 B2-5X/315XY6EG24N9K4
R900922541 DR 30-5-5X/100Y/12
R900922599 4WRZ 16 E150-6X/6AG24N9K4/V
R900922601 ABKAG-40AL9/R4-0,4/80-6-A1-T/205/015E389
R900922602 PV7-1X/40-45RE37MD0-16-A234
R900922606 4WRZ 25 E220-5X/6A24N9K4/V
R900922608 5WRSE 10F1B60-3X/G24K0/B5V
R900922613 H-4WEH 10 D4X/6EG24K4QMBG24
R900922616 4WEH 22 D7X/6EG24N9TS2K4
R900922617 3DR3U 10 DP5-6X/315Y6EG24N9K4/00M SO36
R900922622 LC 16 B40E7X/-004
R900922624 LFA 16 H2-14-7X/F
R900922657 HSZ 06 A218-3X/H100M00
R900922658 HSZ 06 A216-3X/H200M00
R900922666 H-4WEH 25 U10B6X/6EG24N9K4QM0G24
R900922673 4WE 6 U10B6X/EG96K4QM0G24
R900922698 DBEM 20-5X/50YG24NK4M
R900922705 4WE 6 D6X/EW240N9K4
R900922706 ZDR 10 VA4-3X/200YM
R900922785 LFA 25 WEA-7X/A06P06T08
R900922788 4WRZ 10 E25-5X/6A24NETK4/M
R900922793 MH2DBN 22 P2-1X/420-220M-113
R900922797 DBW 15 BG2-4X/200Y6EG24N9DL W65
R900922801 4WS2EM10-5X/90B11ET315K31EV
R900922807 ZDC 25 P-2X/XV-156
R900922863 4WEH 10 D4X/6EG24N9ETK4/11B10
R900922866 4WE 6 D6X/EW100N9DL
R900922869 DB3U 10 D2-5X/200-6EW110N9K4
R900922870 4WRTE 10 Q2-100P-4X/6EG24ETK31/A1M
R900922902 4WE 6 X46-6X/EG24N9K4
R900922904 4WE 6 H73-6X/EG24K4/A12
R900922906 4WEH 10 HD4X/OF6EW110N9ETS2K4
R900922908 4WEH 10 D4X/6EW110N9ETS2K4
R900922909 4WEH 10 J4X/6EW110N9ETS2K4
R900922925 DRE 20-5X/315YG24K4M
R900922927 DREMCH-4X/315Y
R900922938 ABHAG-0225SSO/A10VSO45/160M /012A258A1
R900922941 4WE 6 J2B6X/EG24N9K4QM0G24
R900922942 4WEH 10 J4X/6EG24N9K4/V
R900922944 4WS2EM16-2X/150B12ET210K8EM
R900922947 DBW 10 B2-5X/200S6EW230N9K4R12
R900922965 3WE 6 A6X/OFEW230N9K4
R900922975 H-4WEH 25 X80-6X/6EW110N9ETK4
R900922978 LC 32 B20E7X/-004
R900922980 LC 16 A00D7X/-004
R900922988 LS 1171 X168-2X/CG24K4
R900922992 4WE 6 EB6X/EG80N9K4
R900922997 4WRSE 10 V1-25-3X/G24K0/A1V
R900922999 4WE 10 D3X/CG12N9K4
R900923000 4WREE 6 W08-2X/G24K31/A1V
R900923003 5-4WE 10 H3X/CG24N9K4/A06
R900923005 4WE 6 E6X/EG24N9K4/T06
R900923006 3DR3U 16 DP5-5X/250Y6EW110N9K4/00M SO60
R900923017 ZDREE 10 VP2-1X/200XLMG24NK31M
R900923021 4WRZ 16 W1-150-6X/6AG24N9EK4/D3M
R900923022 4WRZ 16 W150-6X/6AG24N9EK4/D3M
R900923023 4WRZ 25 W1-325-5X/6A24N9EK4/D3M
R900923037 4WE 6 JB6X/EG24N9K4/B10
R900923059 DBAWR 30 BH2N1X/315-6EG24N9K4
R900923066 DBW 30 B1-5X/200-6EG24N9K4
R900923082 LFA 32 EGWA-7X/CA40DQMG24
R900923087 LFA 32 D19-7X/
R900923091 DBAWR 30 BH2N1X/200-6EG24N9K4
R900923099 LFA 32 HWMA2-7X/P10F10
R900923100 LFA 25 HWMA2-7X/
R900923101 LFA 25 DBU2A2-7X/315A200
R900923102 LFA 25 HWMA2-7X/P10F10
R900923103 DBW 10 B1-5X/200-6EG24N9K4
R900923106 DBW 20 B2-5X/315-6EG24N9K4 SO631
R900923107 LFA 32 GWA-7X/A10P10T10
R900923109 DBDR 10 G1X/200/12
R900923124 4WRZ 25 W3-325-5X/6A24NETK4/M
R900923132 DBW 10 B3-5X/315S6EG24N9K4R12
R900923136 LC 16 A40D7X/-004
R900923141 4WE 10 X4A3X/CG24N9K4
R900923145 4WEH 10 EA4X/6EG24K4QM0G24
R900923147 4WEH 10 EB4X/6EG24K4QM0G24
R900923149 3WE 6 B6X/EG24N4K4
R900923155 4WE 6 D6X/EG24NK4/V
R900923156 DAW 10 B2-5X/200-17Y6EG24N9K4
R900923186 4WRZ 16 W100-6X/6AG24NK4/M
R900923187 DREM 20-5X/315YG24K4M
R900923188 DBE 10-5X/200YG24NK4M
R900923189 DBE 10-5X/315YG24K4M-1
R900923190 DBEM 10-5X/315YG24K4M-1
R900923194 LFA 25 KWA3-7X/
R900923204 4WE 6 Y6X/EG24N9K4QMAG24
R900923223 P2V7/40-45C3+V7/10-14C3RE37+01E4
R900923226 LFA 16 WEA-7X/A12P12T12​

力士乐液控单向阀SL20PB4-4X/​