液压元件：柱塞泵、叶片泵、齿轮泵、马达、截止阀、方向阀、减压阀、流量控制阀、比例阀、伺服阀、插装阀、电液换向阀、电磁阀、电磁球阀、蓄能器、放大版、压力继电器、压力传感器。
气动元件：气动阀、阀岛、阀组、电磁阀、换向阀、压力调节阀、流量控制阀，止回阀、气缸和驱动装置、压缩空气气源处理单元、真空技术、传感器、气动连接技术，电气连接技术。
电控伺服：伺服驱动器，伺服电机、PLC模块、I/O模块、框架模块、电源模块、数据接口模块、键相位模块、继电器模块、测速模块、温度模块、显示屏、传感器、探头、前置器、延伸电缆。
液控单向阀是依靠控制流体压力，可以使单向阀反向流通的阀。这种阀在煤矿机械的液压支护设备中占有较重要的地位。液控单向阀与普通单向阀不同之处是多了一个控制油路K，当控制油路未接通压力油液时，液控单向阀就象普通单向阀一样工作，压力油只从进油口流向出油口，不能反向流动。当控制油路油控制压力输入时，活塞顶杆在压力油作用下向右移动，用顶杆顶开单向阀，使进出油口接通。若出油口大于进油口就能使油液反向流动。
2、力士乐SV单向阀功能图：SV20PA1-42/V
3、力士乐SV单向阀技术参数：SV20PA1-42/V
4、力士乐SV单向阀元件尺寸：SV20PA1-42/V
液控单向阀是方向控制阀中的一种。具体分类：
方向控制阀按其在液压系统中的功能分为单向阀和换向阀两大类。
单向阀在液压传动中有普通单向阀和液控单向阀。
(1)保持压力。
滑阀式换向阀都有间隙泄漏现象，只能短时间保压。当有保压要求时，可在油路上加一个液控单向阀，利用锥阀关闭的严密性，使油路长时间保压。
(2)液压缸的“支承”。
在立式液压缸中，由于滑阀和管的泄漏，在活塞和活塞杆的重力下，可能引起活塞和活塞杆下滑。将液控单向阀接于液压缸下腔的油路，则可防止液压缸活塞和滑块等活动部分下滑。
(3)实现液压缸锁紧。
当换向阀处于中位时，两个液控单向阀关闭，可严密封闭液压缸两腔的油液，这时活塞就不能因外力作用而产生移动。
(4)大流量排油。
液压缸两腔的有效工作面积相差很大。在活塞退回时，液压缸右腔排油量骤然增大，此时若采用小流量的滑阀，会产生节流作用，限制活塞的后退速度；若加设液控单向阀，在液压缸活塞后退时，控制压力油将液控单向阀打开，便可以顺利地将右腔油液排出。
(5)作充油阀。
立式液压缸的活塞在高速下降过程中，因高压油和自重的作用，致使下降迅速，产生吸空和负压，必须增设补油装置。液控单向阀作为充油阀使用，以完成补油功能。
(6)组合成换向阀。
在设计液压回路时，有时可将液控单向阀组合成换向阀使用。例如：用两个液控单向阀和一个单向阀并联（单向阀居中），则相当于一个三位三通换向阀的换向回路。需要指出，控制压力油油口不工作时，应使其通回油箱，否则控制活塞难以复位，单向阀反向不能截止液流。
SL20PA2-42/V力士乐液控单向阀
R900500870 SL 20 PA2-4X/V
R900500889 4WRZ 10 W25-5X//M
R900500892 SV 30 PA1-4X/V
R900500903 DR 10 DP3-4X/210Y
R900500923 DR 10-4-5X/315YM
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R900500932 4WE 10 M3X/CG24N9K4
R900500951 SV 25 GA2-4X/
R900500952 SL 15 GB1-4X/
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R900500963 DR 10-6-5X/100YM
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R900501001 4WS2EM10-4X/10B2ET315K8BM-52
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R900501010 SV 15 GA2-4X/V
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R900501116 DR 20-6-5X/100YV
R900501120 DZ 10 DP3-4X/75
R900501121 DR 10 G5-5X/50YM
R900501122 DR 15 G5-5X/100YM
R900501123 DR 15 G5-5X/200YM
R900501124 DR 20 G5-5X/50YM
R900501151 SV 30 GA2-4X/
R900501161 4WE 10 GA3X/CW230N9K4
R900501167 DZ 10-1-5X/100YM
R900501176 DB 30-3-5X/100Y
R900501181 DZ 10 DP2-4X/150
R900501197 SL 20 PA3-4X/V
R900501200 5-4WE 10 J3X/CG24N9K4/CV
R900501228 MH2DBB 22 P9-1X/420YPM18
R900501248 DBC 2-5X/315 SO187
R900501256 DR 25 G5-5X/100YM
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R900501467 Z1SRA 40 F1-1X/M
R900501468 SV 20 PB3-4X/
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R900501486 4WMM 10 EB3X/F
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R900501547 SL 20 PA1-4X/V
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R900501601 5-4WE 10 D3X/CG24N9K4/A10
R900501604 4WMD 10 J3X/F/V
R900501652 SL 30 PA4-4X/
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R900501680 Z4WH 22 E63-5X/
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R900501701 SV 20 PB1-4X/
R900501718 DB 10-5-5X/100Y
R900501749 ZDB 6 VP7-4X/50V
R900501758 DB 30-2-5X/315X SO283
R900501762 DZ 10 DP2-4X/210
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R900501819 DA 10-3-5X/200-17
R900501823 4WMDA 10 MA3X/F
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R900501853 DZ 10 DP2-4X/150XM
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R900501897 SL 30 PA4-4X/V
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R900501943 SL 10 PA1-4X/SO139
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R900501954 4WN 10 G3X/
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R900501970 DZ 10 DP2-4X/150XYM
R900501980 SV 15 GA2-4X/
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R900501993 4WE 10 X20-3X/CG24N9K4
R900501997 DR 10-4-5X/350YM
R900502046 DRC 30-3-5X/315Y SO151
R900502051 MHDBD 10 K2-1X/050M
R900502052 LFA 80 D-6X/F
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R900502098 5-4WHD 10 X102-3X/YAW SO441
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R900502158 DZ 30-2-5X/100Y
R900502173 DAC 1-5X/315-17
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R900502193 SL 30 GB2-4X/
R900502240 SV 30 PB1-4X/
R900502253 DZ 10-2-5X/50Y
R900502257 DZ 10-3-5X/200
R900502258 DZ 30-3-5X/200Y
R900502277 PV7-1X/40-45RE37MC5-16
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R900502296 DZC 2-5X/100XY
R900502316 DZ 10 DP2-4X/315YM SO4
R900502317 DZ 10 DP2-4X/75XY
R900502331 SL 30 GA1-4X//12
R900502332 SV 25 GA1-4X//12
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R900502372 4WMM 10 X65-3X/
R900502420 Z4WH 16 E63-5X/
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R900502462 DAC 2-5X/100-17
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R900502631 HSA 10 B009-3X/M00
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R900502897 DZ 10-2-5X/100
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R900502988 DZ 10-2-5X/100YM
R900503022 4WE 10 L3X/CG24N9K4 SO9
R900503038 DB 20 G2-5X/350XY
R900503083 DB 10-3-5X/50
R900503084 DA 20-3-5X/100-17
R900503154 ZDB 6 VP7-4X/200V
R900503159 MH2FAER 22 DA4X/1HG24C4A10V11=CT
R900503161 DZ 20-2-5X/200XM
R900503177 LCT 25 A20D2X/V
R900503191 DRC 5-5X/50Y
R900503192 DZC 2-5X/50
R900503195 DZC 2-5X/315XY
R900503202 DZ 10 DP2-4X/75Y
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R900503225 SL 15 GA1-4X/V
R900503240 DZ 10 DP1-4X/210YM
R900503242 DZ 10 DP2-4X/150Y
R900503244 DZ 10-1-5X/200XM
R900503250 DB 20-2-4X/200 W65
R900503251 DZ 10 DP1-4X/150Y
R900503263 4WE 10 JA3X/CW230N9K4
R900503265 4WE 10 J3X/CG24K4
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R900503336 DR 10 DP1-4X/210Y
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R900503370 FD 16 PA2X/B06V-006
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R900503381 DR 30-5-5X/50Y
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R900503383 DRC 30-6-5X/315Y
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R900503396 DA 30-2-5X/315-17
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R900503405 4WE 10 G3X/CG12N9K4
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R900503424 4WE 10 T3X/CG24N9K4
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R900503450 DZ 10-2-5X/50
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R900503632 SV 15 GA1-4X//12
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R900503635 DAC 2-5X/200-10
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R900503638 5-4WE 10 J3X/CG24N9K4/V
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R900503817 LFA 50 QR10-6X/CA40D
R900503839 ZDB 10 VP2-4X/200V SO30
R900503840 DA 10-3-5X/315-17
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R900504124 SV 30 GB2-4X/
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R900504955 SL 20 PB2-4X/V
R900504957 SL 10 PA3-4X/V
SL20PA2-42/V力士乐液控单向阀
基本的执行机构用于把阀门驱动至全开或全关的位置。用于控制阀的执行机构能够精确的使阀门走到任何位置。尽管大部分执行机构都是用于开关阀门，但是如今的执行机构的设计远远超出了简单的开关功能，它们包含了位置感应装置，力矩感应装置，电极保护装置，逻辑控制装置，数字通讯模块及PID控制模块等，而这些装置全部安装在一个紧凑的外壳内。
SL20PA2-42/V力士乐液控单向阀
R900504959 DB 20 G2-5X/50Y
R900504961 Z4WH 10 E51-4X/
R900504974 3DS2EH 10-2X/A2-140K8M
R900504985 ZDR 10 DP2-5X/315YM SO4
R900504989 4WHD 10 D3X/SO63
R900505004 Z2FS 6-5-4X/2Q
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R900505145 DBC 30-2-5X/315/12
R900505152 Z2S 10A1-3X/V SO30
R900505157 DB 10-3-5X/315X
R900505166 Z4WH 6 E51-1X/
R900505205 LC 80 DB40D6X/
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R900505256 4WE 10 Q3X/CW110N9K4
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R900505306 DB 30-2-5X/200XY
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R900505394 DZ 20-2-5X/100
R900505446 LT 06-A06-3X/150B80/02M
R900505516 5-4WMRC 10 D3X/SO122
R900505541 DAC 30-2-5X/200-17Y
R900505543 4WE 10 G3-3X/CG24N9K4
R900505554 SV 30 PA4-4X/
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R900505743 4WS2EB10-4X/10B2ET140K8AM
R900505759 DAC 2-5X/200-17Y
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R900505901 DR 10 DP2-4X/25Y
R900505950 SL 20 GB3-4X/
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R900505977 DR 10-5-5X/315YMV
R900506008 4WE10G3X/CG96N9K4
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R900506107 4WMR 10 D3X/YAW
R900506114 4WE 10 E78-3X/CG24N9K4
R900506116 4WE 10 X83A3X/CG24N9K4
R900506142 DR 6 DP2-5X/75YM W43
R900506180 4WSE3EE16-1X/200B8-315K9EV
R900506196 FD 16 FB2X/400B04V
R900506201 ZDR 10 VB5-3X/200YM
R900506203 DZ 10-3-5X/200XY
R900506271 4WMRA 10 D3X/YAW SO117
R900506289 DB 10 G2-4X/50U W65
R900506300 DZC 30-2-5X/50XY
R900506323 DB 20-2-5X/200YV
R900506332 5-4WMR 10 D3X/YAW SO85
R900506334 DBC 30-2-5X/200
R900506336 ZDR 6 DP1-4X/75YMV
R900506354 DR 10-4-5X/50YM
R900506366 Z2S 10-4-3X/V
R900506369 ZDR 10 VP6-3X/315YM SO30
R900506373 ZDB 10 VB3-4X/100V
R900506390 LC 80 DB40E6X/
R900506464 MH2WH 18 B02F1X/006LM11
R900506467 MHDBT 22 K2-1X/420B09M
R900506473 PV7-1X/16-20RE01MC5-16
R900506585 DB 20-2-5X/100YU
R900506604 DBC 30-2-5X/315V
R900506613 STD 0095-1X/25/M
R900506664 DB 10-2-4X/315XY W65
R900506685 DB 10 G2-5X/100Y
R900506697 DZ 10 DP2-4X/25
R900506723 4WMM 10 D3X/FYABW
R900506739 ZDB 10 VA1-4X/200V
R900506776 DB 10-5-5X/315
R900506797 DB 30 G2-5X/315Y
R900506798 DBC 30-2-5X/50
R900506800 4WMDA 10 C3X/F
R900506808 PV7-1X/63-71RE07MC0-16
R900506809 PV7-1X/100-118RE07MC0-16
R900506856 DZ 30-2-5X/100
R900506917 LC 80 A40E6X/
R900506924 DZ 30-1-5X/315YM
R900506957 FD 16 FB2X/300B04V
R900506963 M-SR 15 KE05-1X/SO13
R900506965 M-SR 8 KE05-1X/SO14
R900506970 DA 10-2-5X/315-17V
R900506979 DR 30-5-5X/350YM
R900506985 DB 20 G2-5X/200X
R900506999 SV 20 PA1-4X/SO67
R900507009 DB 20-1-5X/350
R900507010 DA 30-2-5X/200-17Y
R900507041 MR 700F-P1N1N1N1N
R900507043 SL 10 GB1-4X//12
R900507045 MH2FAER 22 DA4X/1HG12C4A10V11
R900507069 ZDB 10 VA3-4X/50V
R900507095 DA 10-2-5X/50-10
R900507110 SL 30 PA1-4X/SO67
R900507126 Z2S 10A1-3X/V SO40
R900507180 DA 20-2-5X/200-17V
R900507198 DR 20-6-5X/200Y
R900507209 MHFE 12 ZA1X/4AG24NZ4-060V07
R900507211 SL 20 GA4-4X/
R900507213 DZ 10 DP1-4X/210
R900507217 DZ 10-3-5X/200Y
R900507224 SV 25 GB1-4X/V
R900507278 FD 16 FA2X/B00V
R900507303 DR 10 DP1-4X/150Y
R900507308 DR 20-5-5X/50YMV
R900507380 5-3WE 10 B3X/CG24N9K4
R900507389 DZC 30-1-5X/200
R900507395 4WMDA 10 EA3X/F
R900507430 DZ 20-2-5X/100Y
R900507450 DB 20 G3-5X/315V
R900507457 DR 30 G4-5X/50YM
R900507459 ZDB 6 VP1-4X/50
R900507469 Z2S 22 A3-5X/
R900507497 4WE 10 J3X/CG24N9K4/B12
R900507503 DB 10-2-5X/100V
R900507526 ZDB 6 VA1-4X/100V
R900507568 4WHD 10 RB3X/OF SO12
R900507578 FD 12 FA2X/B00V
R900507589 DA 20-1-5X/100-10
R900507590 DB 10-1-5X/315X/12 SO559
R900507611 DB 10-1-5X/100XY
R900507672 DR 10 DP1-4X/25Y
R900507735 5-3WE 10 A3X/CG24N9K4
R900507740 SV 20 PB4-4X/
R900507744 DAC 30-2-5X/100-17
R900507772 4WP 10 D3X//V
R900507777 Z2S 16B1-5X/SO40
R900507785 LFA 80 DBEM-6X/400
R900507812 3WMD 10 A3X/F
R900507825 4WH 6 D5X/SO104
R900507876 DR 30 G4-5X/315YM
R900507883 MR 2800I-P1N1N1N1N
R900507897 DR 10 G6-5X/100YMV
R900507902 ZDR 10 VA6-3X/200YMV
R900507929 SV 25 GA1-4X/V
R900507946 DR 20-6-5X/200YMV
R900507951 Z2FS 6 A3-4X/1QV
R900507956 MH2FANR 22 DA4X/1HA00V11
R900507963 ZDR 6 DA3-4X/210YV
R900507970 ZDB 6 VP1-4X/100
R900508001 FGS 10 C1-1X/V
R900508003 FGS 16 C1-1X/V
R900508019 DZ 10 DP2-4X/75X
R900508053 ZDR 10 VB5-3X/315Y
R900508100 DZ 30-1-5X/200XM
R900508112 ZDR 10 DA2-5X/75Y W5
R900508141 MH2FANR 32 DA4X/1A00V11
R900508154 DZ 10-2-5X/100V
R900508160 DR 20-5-5X/315YV
R900508198 4WN 10 H3X/
R900508207 LFA 80 DBS2-6X/400
R900508214 MH2FAER 18 DA4X=1G24C4A06V11
R900508234 SL 20 GA2-4X/V
R900508267 DB 20-2-4X/350X W65
R900508340 ZDR 10 DA1-5X/150YV
R900508341 ZDR 10 DP1-5X/150YMV
R900508342 DB 10 G1-5X/315
R900508354 SL 30 PB1-4X/V
R900508400 ZDR 10 VB6-3X/100Y
R900508417 DB 6 K2-4X/350YV
R900508418 DBDS 4 K1X/315
R900508423 DB 6 K3-4X/200Y SO2
R900508425 SV 20 GA1-4X//12
R900508441 MG 10 G1X/V/12
R900508442 MG 20 G1X/V/12
R900508470 ZDR 10 VB6-3X/100YV
R900508489 DB 10 G2-5X/200Y
R900508498 DR 30-4-5X/200Y
R900508503 4WMM 10 F3X/
R900508538 DBF 2-3X/315
R900508540 LFA 125 WEA-2X/P25
R900508586 DBGC-1X/200P2
R900508670 Z2S 16-4-5X/V
R900508673 4WMM 10 E3X/F SO12
R900508769 1TH 7 QL06-1X/M01
R900508780 ZDB 6 VA2-4X/350V
R900508847 MCR 03 F225F180Z-3X/A0M/01
R900508857 4WS2EM10-4X/45B2ET315K8BM
R900508905 DZ 10-3-5X/200YM
R900508927 5-4WE 10 D20-3X/OFCG24N9K4/A07
R900508948 5-4WE 10 C3X/CG24N9K4/C
R900508963 SL 20 GA1-4X//12
R900508968 SV 10 GA2-4X/SO43
R900509000 4WE 10 Y3X/CG24NK4
R900509026 DB 30-1-5X/315U
R900509038 DB 20-2-5X/350V
R900509043 DB 30-2-5X/50U
R900509053 PV7-1X/10-14RE01MC7-16
R900509061 DB 30-2-5X/315YV
R900509062 DR 10-5-5X/50YV
R900509085 DB 10-1-5X/100U
R900509096 Z2DB 6 VC3-4X/50V
R900509166 3WMDA 10 A3X/F
R900509221 MH2FAER 22 DA4X=1G12C4A10V11
R900509256 DRC 30-4-5X/315Y
R900509274 PV7-1X/16-20RE01MD0-16
R900509277 DR 20-7-5X/50YM
R900509287 4WMM 10 J3X/YABW
R900509327 Z1SRA 40 H1-1X/M
R900509344 DR 10 DP2-4X/25YMV
R900509397 4WMM 10 E65-3X/
R900509400 DR 10 DP7-4X/75Y
R900509442 FD 16 PA2X/B03V-006
R900509451 DB 30 G2-5X/50X
R900509452 HED 5 OA2-2X/50K14
R900509453 SV 10 GB2-4X/V
R900509458 SL 20 PB1-4X/V
R900509466 DA 20-2-5X/200-10
R900509468 DB 20-2-5X/350Y
R900509502 DR 20-5-5X/315Y/12
R900509504 FD 12 PA2X/B03V12
R900509506 PV7-1X/25-30RE01MD0-16
R900509508 DBWC .2-5X/315-6S
R900509536 MHB 10 SFM1X/00U315T15V15
R900509551 SL 20 GB1-4X/V
R900509554 DA 20-2-5X/315-10Y
R900509610 SV 10 GB4-4X/V
SL20PA2-42/V力士乐液控单向阀
