cg星空游戏免费
联系方式
联系人:张惠淑
手机:13795314102
电话:86-021-32586665
传真:86-021-52500777
地址:上海市普陀区中江路889号曹杨商务大厦1501—1504
邮编:200333
邮箱:2852785352@qq.com
产品中心
Rexroth力士乐比例阀是由湿式阀用电磁铁,阀芯,传动柱塞,阀套,顶针杆,钢球,钢球座,复位弹簧等组成。阀芯与阀体为螺纹联接。传动柱塞一端连接电磁铁衔铁,另一端顶住钢球。因此无论是上端电磁铁的推力还是下端弹簧的作用力都使两钢球与顶针杆成连动关系。顶针杆两端与阀芯之间各有一段环形控制容腔,并分别与阀芯上的径向孔道连通。这是一种二位三通双球常闭式电磁阀。当电磁铁断电时,从P腔进入的压力油直接作用在先导阀的球座上,而复位弹簧的弹性力也同向作用在球座上,使先导阀下阀口关闭,上阀口打开,因而使压力油路与控制油路A阻断,控制油路与回油路T开通。BOSCH-Rexroth力士乐比例伺服阀采用一次开阀和二次开阀连在一体,主阀和导阀分步使电磁力和压差直接开启主阀口。当线圈通电时,产生电磁力使动铁芯和静铁芯吸合,导阀口开启而导阀口设在主阀口上,且动铁芯与主阀芯连在一起,此时主阀上腔的压力通过导阀口卸荷,在压力差和电磁力的同时作用下使主阀芯向上运动介质流通。
BOSCH-Rexroth比例阀的内部结构可分滑阀位置反馈、载荷压力反馈和载荷流量反馈;阀的级数可分单级、双级和多级。在电液伺服阀中,将电信号转变为旋转或直线运动的部件称为力矩马达或力马达。力矩马达浸泡在油液中的称为湿式,不浸泡在油液中的称为乾式。其中以滑阀位置反馈、两级乾式电液伺服阀应用zui广。电液伺服阀的工作原理是力矩马达在线圈中通入电流后产生扭矩,使弹簧管上的挡板在两喷嘴间移动,移动的距离和方向随电流的大小和方向而变化。例如挡板向右移近喷嘴时,就在主阀芯两端面上产生压力差推动主阀芯左移,使压力油口P S与载荷1口相通,回油口与载荷 2口相通。主阀芯左移的同时通过反馈杆对力矩马达产生的力矩和挡板的位移进行负反馈。因此,主阀芯的位移量就能精确地随著电流的大小和方向而变化,从而控制通向液压执行元件的流量和压力。
Rexroth力士乐比例伺服阀的输出压力较高或通径较大时,用调压弹簧直接调压,则弹簧刚度必然过大,流量变化时,输出压力波动较大,阀的结构尺寸也将增大。为了克服这些缺点,可采用先导式减压阀。先导式减压阀的工作原理与直动式的基本相同。先导式减压阀所用的调压气体,是由小型的直动式减压阀供给的。若把小型直动式减压阀装在阀体内部,则称为内部先导式减压阀;若将小型直动式减压阀装在主阀体外部,则称为外部先导式减压阀。 当喷嘴与挡板之间的距离发生微小变化时,就会使B室中的压力发生根明显的变化,从而引起膜片10有较大的位移,去控制阀芯6的上下移动,使进气阀口8开大或关小、提高了对阀芯控制的灵敏度,即提高了稳压精度。 其工作原理与直动式相同。在主阀体外部还有一个小型直动式减压阀(图中末示出),由它来控制主阀。
Rexroth力士乐比例伺服阀使用说明书
用途:本阀门系自动控制执行器中常见的电磁阀类,可程序控制或远程控制蒸汽、液体、油、气等介质管路的通断。此阀具有应用广泛,使用介质种类多,工作压力范围广,使用寿命长等特点。
工作原理:该阀采用一次开阀和二次开阀于一体的特殊结构形式,未通电时,电磁阀呈关闭状态。通电时,线圈产生磁场吸动铁芯,提起阀杆导阀口打开,阀塞上下产生压力差,将活塞托上。当介质压力很小时(甚至为零)动铁芯随阀杆将活塞直接拉上,此时主阀口也成通路,这时动作原理为只动形式,该阀特点可在零压差下工作,且流量比先导阀大。
上海维特锐现货表:
4WE6E6X/SG24N9K4/V 电磁阀
A10VS071DRS 32R-VPB22U99 电磁阀
S6A1.0 R900422881 电磁阀
ZDB6VA24X/315V 电磁阀
Z2S2215X R90043815 电磁阀
A4VS0125DR/30R-FPB13N00 R902438020 柱塞泵
0510625013 AZPF1X/019RCB20MB 齿轮泵
0510665330 齿轮泵
A10VSO18DFR1/31RVPA12K01 柱塞泵
4WE6C6X/EG24N9K4 R900561272 电磁阀
4WE10Q3X/CG24N9K4 电磁阀
DBDS6K1X/25 液压阀
MSR10KE05-1X R900344549 电磁阀
0510425009AZPF-1X-008RCB20MB 齿轮泵
M3SED10CK1X/350CG24N9K4 R900586685 电磁阀球阀
4WE10J3X/CG24N9K4 R900589988 电磁阀
LFA40EH27X/CA10DQMG24FX08 R901344477 电磁阀
ZDB6VP24X/315V 电磁阀
4WE10H3X/CG24N9K4 电磁阀
MSR15KE051X/R900345372 电磁阀
4WE10L3X/CG24N9K4 R900599646 电磁阀
DR10DP24X/150YM 电磁阀
DR6DP25X/75YM 电磁阀
4WE6M6X/EG24N9K4 电磁阀
4WE10E3X/CW230N9K4/V 电磁阀
SL10PA14X/V 电磁阀
ZDR10DP25X/150YM 压力阀
4WE6Y7X/HG24N9K4 R901089243 电磁阀
R900021267(Z31) 七芯插头
4WE6J6X/EW230N9K4/V R900911762 电磁阀
0510525009 AZPF-1X/011RCB20MB 齿轮泵
0510525312 齿轮泵
PVV1-1X036RA15DMB 液压泵
PVV4-1X/069RA15DMC 叶片泵
A4VS0180DR/30R-FPB13N00 R902437379 柱塞泵
R902160881 A2FO107/61R-PPB105 油泵
A4VSO71DR/10R-PPB13N00 R902423294 柱塞泵
0510425020 AZPF-10-008RRR20MB 柱塞泵
R910912007 A10VSO100DR/31R-PPA12N00 油泵
A4VSO250DR/30R-PPB13N00 R910974769 柱塞泵
0510112014 柱塞泵
4WREE6E162X/G24K31/A1V R900920567 比例阀
4WE6J7X/HG24N9K4 R901089241 电磁阀
4WEH16E7X/6EG24N9ETK4 电磁阀
R901000846 DBET6X/200G24K4V 比例溢流阀
MSR20KE051X 单向阀
Z2FS2283X/S2 R900443176 电磁阀
LFA32GWA-7X R900912708 插装电磁阀
R901086060 Z1S6T50-4X/V 电磁阀
0811404643 4WRPEH6C3B25P-2X/G24K0/A1M 比例阀
4WE6J6X/EW230N9K4 (R900908589) 电磁阀
R900410808 ZDR6DA2-4X/25Y 电磁阀
M3SEW6U3X/420MG24N9K4 R900566283 电磁阀
4WREE6E32-2X/G24K31/A1V R900907114 液压阀
R900422189 ZDB10VA24X/200V 电磁阀
4WRAE10E60-2X/G24N9K31/A1V R900558356 比例阀
Z1S10T13X/V 电磁阀
4WE10C33/CG24N9K4 R900593277 电磁阀
DBDS6P1X/315 溢流阀
S20P05-1X 单向阀
R900421222 SCA16CZ2X/M 压力补偿器
DBEM107X/100YG24K4M R901335402 比例阀
ZDB10VB1-4X/50V R900967522 溢流阀
ZDB10VB1-4X/200V R900595254 溢流阀
上海维特锐丁剑宇欢迎您的询价!
ZDB10VA2-4X-100V R900424537 溢流阀
Z2DB10VD2-4X/200V R900411358 液压阀
Z2DB6VD2-4X/200V R900411314 液压阀
ZDB6VA1-4X/100V R900507526 溢流阀
DBEME10-7X/100YG24K31A1M R901358181 溢流阀
R900467370 电磁阀
P901029967 DBETE-6X/100G24K31A1V 液压阀
4WE6D6X/EG24K4QMBG24 R900574632 电磁阀
ZDB10VA2-4X/315V R900409955 溢流阀
4WE10D5X/EG24N9K4/M R901278760 换向阀
R900954106 4WRE10W50-2X/G24K4/V 电磁阀
R900954107 4WRE10W75-2X/G24K4/V 比例方向阀
R900082899 插头
DB20-2-5X/200Y R900596528 液压阀
4WREE6V32-2X/G24K31/F1V R900926747 比例阀
M-SR25KE05-1X 电磁阀
M-SR30KE05-1X 电磁阀
Z2S16-3-5X R900412346 电磁阀
DBEM107X/315YG24K4M R9001335399 溢流阀
M3SEW6C3X/420MG24N9K4+Z4 R900566273 电磁阀
1827414900 电磁阀
5811290650 气动电磁阀
0821300860 气动元件
1829207040 气动元件
HE0524806 液压元件
DGMC3ATGWB41 电磁阀
DGMFN7YA2HB2H20 液压阀
4WREE6E162X/G24K31/A1V现场图片
换向阀:
4WE6M7X/HG24N9K4 4WE6HB7X/HG24N9K4 4WE6JA7X/HG24N9K4 4E6EA7X/HG24N9K4
4E6EB7X/HG24N9K4 4WE6EA6X/EG24N9K4 4WE6EB6X/EG24N9K4 4WE6HB6X/EG24N9K4
4WE6HA6X/EG24N9K4 4WEH16E7X/6HG24N9ETK4 4WEH16J7X/6HG24N9ETK4
4WEH16L7X/6HG24N9ETK4 4WEH16U7X/6HG24N9ETK4 4WEH16Y7X/6HG24N9ETK4
4WEH16D7X/6HG24N9ETK4 4WEH16E7X/6EG24N9ETK4 4WEH16J7X/6EG24N9ETK4
4WE6D62/EW230N9K4 4WE6E62/EW230N9K4 4WE6J62/EW230N9K4
4WE6D7X/HG24N9K4 4WE6C7X/HG24N9K4 4WE6E7X/HG24N9K4 4E6L7X/HG24N9K4 4WE6Y7X/HG24N9K4 4WE10C3X/CW230N9K4 4WE10C3X/CG24N9K4 4WE10D3X/CG24N9K4 4WE10D33/CG24N9K4 4WE10D3X/OFCG24N9K4 4WE10D33/OFCG24N9K4 4WE10D3X/CW230N9K4 4WE10D33/CW230N9K4 4WE10E3X/CG24N9K4 4WE10E33/CG24N9K4 4WE10E3X/CW230N9K4 4WE10E33/CW230N9K4 4WE10E3X/OFCG24N9K4 4WE10Y3X/CG24N9K4 4WE10Y33/CG24N9K4 4WE10Y3X/CW230N9K4 4WE10Y33/CW230N9K4 4WE10G3X/CG24N9K4 4WE10G33/CG24N9K4 4WE10G3X/CW230N9K4 4WE10G33/CW230N9K4 4WE10J3X/CG24N9K4 4WE10J3X/CG24N9K4/B10 4WE10J33/CG24N9K4 4WE10J3X/CW230N9K4 4WE10J33/CW230N9K4 4WE10M3X/CG24N9K4 4WE10M33/CG24N9K4 4WE10M3X/CW230N9K4 4WE10M33/CW230N9K4 4WE10U3X/CW230N9K4 4WE10L33/CG24N9K4 4WE10L33/CW230N9K4 4WE10EA3X/CG24N9K4 4WE10EA3X/CW230N9K4 4WE10EB3X/CG24N9K4 4WE10EB3X/CW230N9K4 4WE10F3X/CG24N9K4 4WEH10D4X/HG24N9K4 4WEH10E4X/HG24N9K4 4WE6E50/AG24NZ5L 4WE6E50B/AW220-50NZ4 4WE6E6X/OFEG24N9DKL 4WE6E50/AG24NE4 4WE6E61/EG24NZ5L 4WE6E5X/AG24N24 4WE6C61/EW230N9K4
4WE6A6X/EW230N9K4 4WE6A6X/EW220N9K4 4WE6A6XEW220N9K4 4WE6A6X/EW230N9K4
4WE6A6X/EW230N9K4 4WE6A6X/EW230N9K4 4WE6R73-6X/EG24N9K4/A12
3WE6A6X/EG24N9K4 3WE6A62/EG24N9K4 3WE6A6X/EW230N9K4 4WE6B61/EG24N9K4 4WE6D6X/EG24N9K4 4WE6D62/EG24N9K4 4WE6D6X/EW230N9K4 4WE6D62/EG220N9K4 4WE6D62/EW230N9K4 4WE6D6X/OFEG24N9K4
4WE6D6X/OFCG24N9Z5L 4WE6D6X/OFEG24N9K4/B18 4WE6D6X/OFSG24N9K4 4WE6E6X/EG24N9K4
4WE6E62/EG24N9K4 4WE6A6X/EW220N9K4 4WE6E6X/OFEG24N9K4 4WE6D6X/OFSG24N9K4 4WE6J6X/EG24N9K4 4WE6J6X/EW230N9K4 4WE6J6X/OFEG24N9K4 4WE6Y6X/EG24N9K4 4WE6Y6X/EW230N9K4 4WE6Y6X/OFEG24N9K4 4E6G6X/EG24N9K4 4WE6G6X/OFEG24N9K4 4WE6H6X/EG24N9K4 4WE6H6X/OFEG24N9K4 4WE6H6X/EW230N9K4 4WE6U6X/EG24N9K4 4WE6U62/EG24N9K4 4WE6U62/EG230N9K4 4WE6U62/EG230N9K4 4WE6L62/EG24N9K4 4WE10Y33/CG24N9K4 4WE10D33/CG24N9K4 4WE10C33/CG24N9K4 4WE10L33/CG24N9K4 4WE10U33/CG24N9K4 4WE10J33/CG24N9K4 4WE10E33/CG24N9K4 4WE10G33/CG24N9K4 4WE10H33/CG24N9K4 4WE6Y62/EW230N9K4 4WE6J62/EW230N9K4 4WE6G62/EW230N9K4 4WE6G62/EW110N9K4 4WE10D33/CW230N9K4 4WE10E33/CW230N9K4 4WE10J33/CG24N9K4 4WE10J33/CW230N9K4 4WE10H33/CW230N9K4 4WE10G33/CW230N9K4 4WE6E62/EG24N9K4 4WE6E62/EW230N9K4 4WE6E6X/EG24N9K4 4WE6E50/AW220NZ5L 4WE6E6X/SG24N9K4 4WE6E62/EG12N9K4 4WE6E6X/SG24N9K4 4WE6E6X/EW230N9K4 4WE6E6X/EG24N9K4+Z5L 4WE6E6X/EG24N9K4/V 4WE6E6X/EG24N9K4 4WE6E6X/BG24N9K4_5031339
4WE6E61B/CW220-5N9Z5L 4WE6E6X/AG24N24 4WE6E61B/AG24N9Z5L 4WE6E6X/EG24N9K4 4WE6E-5X/AG24NZ4 4WE6EA62/EG24N9K4/B10 4WE6E52/AG24NZ4 4WE6E61/EG24N9K4
电磁溢流阀:
DBW10B1-5X/200-6EG24N9K4 DBW10A1-5X/200-6EG24N9K4 DBW10B1-5X/315-6EG24N9K4
DBW10A1-5X/315-6EG24N9K4 DBW20B1-5X/315-6EG24N9K4 DBW20B1-5X/100-6EG24N9K4
DBW20B1-5X/315-6EG24N9K4 DBW20A1-5X/315-6EG24N9K4 DBW10B1-5X/200-6EW230N9K4
DBW20B1-5X/200-6EW230N9K4 M-3SED6UK1X/350CG205N9K4 M-3SED6UK1X/350CG24N9K4
M-3SED6CK1X/350CG24N9K4 M-2SEW6N3X/420MG205N9K4 M-3SEW6C3X/420MG24N9K4
M-3SEW6C3X/630MG24N9K4 M-3SEW6U3X/420MG24N9K4 M-3SEW6U3X/630MG24N9K4
电液换向阀:
0810050112 H-4WEH16E1X/6ZG24N9K4/Z 0810050113 H-4WEH16E1X/6ZG24N9EK4/Z
0810050134 H-4WEH16U1X/6ZG24N9ETK4/B08Z 0810050160 H-4WEH16EB1X/6ZG24K4/QM0G24/ZV
R900244202 4WEH16J7X/6EG24N9ES2K4/B10 R900245525 4WEH10E4X/6EG205N9ETSK4/B10
R900246842 H-4WEH25J6X/6EG24N9EK4/10B12 SO843 R900247509 4WEH22LB7X/6EG24N9EK4/B10
R900247589 4WEH16E42-7X/6EG24N9EK4/B10 R900247713 4WEH22HD7X/OF6EG24N9ETK4
R900248287 4WEH16J7X/6EW110N9ES2K4/B10 R900248848 4WEH16Y7X/6EG24N9ETK4/B10
R900248983 4WEH16EB7X/6EG24N9ETK4/B10 R900578288 4WEH10J4X/6EG24N9K4
R900608720 4WEH16E7X/6EG24N9K4/B10 R900617260 4WEH22D7X/6SG24N9ETK4/B10
R900617661 4WEH16J7X/6EG24NES2K4/B10V R900617764 H-4WEH25G6X/6SG24N9TK4
R900617804 4WEH16D7X/6SG24N9ETK4/B10 R900617851 4WEH16HD7X/OF6EG24N9K4/B10
R900618334 H-4WEH32HD6X/OF6EG24N9ETS2K4/B10D3 R900700894 4WEH16E7X/6EG24K4QM0G24/N05 SO746
R900701184 4WEH16H7X/6EG24N9ETK4/B10P4,5 R900702161 H-4WEH16G7X/6EW230N9ETSK4/B10P4,5D3
R900710599 4WEH16D7X/6EG24N9ETK4/B10D3V R900711896 4WEH16L7X/6EG24N9ETK4/B08
R900715328 4WEH10J4X/6EG24N9TK4/B10 R900717910 4WEH10J4X/6EG24N9ETK4/B06
R900718491 4WEH16J7X/6EG24N9ETS2K4/B10V R900723240 4WEH10E4X/6EG24NETK4/B10
R900727197 4WEH16E7X/6EG24N9ES2K4/B10 R900727342 4WEH22J7X/6EW230N9K4/B10D3
R900728043 H-4WEH25HD6X/OF6EG24N9ETK4/B10D3 R900728889 H-4WEH22Y7X/6EG24N9ES2K4/B10D3
R900728893 4WEH16HD7X/OF6EW230N9ETK4/B10V R900737154 4WEH22R7X/6EG24N9ETS2K4
R900739098 4WEH16U7X/6EG24N9ETK4/B10 R900740438 4WEH22J7X/6EG24N9ES2K4/B10V
R900744319 4WEH10G4X/6EG24N9ETK4/B10 R900744837 4WEH16D7X/6EW110N9TS2K4
R900747356 4WEH16J7X/6EG24N9EK4/B08P4,5 R900747381 4WEH16HD7X/OF6EG24N9EK4/B08P4,5
R900747382 4WEH22HD7X/OF6EG24N9EK4/B08P4,5 R900747704 4WEH22Q7X/6EG24N9K4
R900749396 4WEH16HD7X/O6EG24N9K4 R900750747 H-4WEH25E6X/6EW110N9SK4/B10D2
R900751327 4WEH22M7X/6EG24N9ETK4/B10D3 R900751779 4WEH32E6X/6EG24N9EK4/10B10
R900752588 4WEH16HD7X/OF6EW230N9ES2K4/B10 R900752824 Z4WEH10E63-5X/4KEG24N9ETK4
R900757127 H-4WEH32J6X/6EG24N9ES2K4/B10D3 R900758807 H-4WEH25J6X/6EG24N9ES2K4/B10D3
R900759005 4WEH16G7X/6EG24N9ETK4/B10 R900760284 4WEH22HD7X/OF6EG24N9ETS2DJL1/B10
R900760288 H-4WEH32J6X/6EG24N9ETS2DJL1/B10D3
R900760695 H-4WEH32HD6X/OF6EG24N9ETS2DJL1/B10D3 R900763132 4WEH10J4X/6EG24N9TK4
R900763991 4WEH32L6X/6SG24N9ETK4/B10 R900764834 4WEH16U7X/6SG24N9EK4/B10
R900766941 H-4WEH25U6X/6EG110N9ES2K4/B10D3 R900769118 H-4WEH25Y6X/6EG24N9ES2K4/B10D3
R900772483 4WEH16Y7X/6SG24N9ETK4/B10 R900774752 4WEH16D7X/6EG24N9ETS2K4/B10
R900776955 4WEH16LB7X/6SG24N9ETK4/B10 R900778416 4WEH32J6X/6EG24N9EK4/B10
R900782736 4WEH32E6X/6SG24N9K4 R900785552 4WEH32HD6X/OF6EG24N9ES2K4/B10V
R900901159 Z4WEH10E63-4X/6EG24N9ETK4 R900906426 H-4WEH22J7X/6EG24N9K4
R900907649 4WEH22E7X/6EG24N9ETS2K4 R900909016 4WEH22J7X/6EW230N9ES2K4
R900910795 4WEH22J7X/6EG24N9ES2K4 R900914691 H-4WEH25J6X/6EG24N9ETK4
R900916452 4WEH22J7X/6EG24N9K4 R900917595 Z4WEH16 E63-5X/6EG24N9K4/B10 SO16
R900918440 4WEH22J7X/6EG24N9ETK4/B08 R900918449 4WEH10J4X/6EW230N9ETK4
R900919832 4WEH22D7X/6EG24N9ETK4 R900919833 4WEH22E7X/6EG24N9ETK4
R900919838 4WEH32EA6X/6EG24N9ETK4 R900920355 4WEH22HD7X/OF6EG24N9EK4
R900921129 4WEH22J7X/6EW230N9ETK4 R900921641 4WEH10J4X/6EG24N9ETS2K4/B10
R900922083 4WEH16D7X/6EG24N9ETK4 R900922084 4WEH16E7X/6EG24N9ETK4
R900922085 4WEH16J7X/6EG24N9ETK4 R900922282 4WEH10M4X/6EG48N9K4
R900923685 4WEH10J4X/6EG24N9ETS2K4/B10D3 R900923811 4WEH16E7X/6EG24N9K4
R900923852 4WEH16J7X/6EG24N9ES2K4 R900923868 4WEH16HD7X/OF6EG24N9ETK4
R900923887 4WEH16E7X/6EG24N9ES2K4 R900923971 4WEH16E7X/6EG24N9ETK4/B10
R900923989 4WEH16D7X/6EG24N9K4 R900924024 4WEH16C7X/6EG24N9K4
R900924322 H-4WEH25C6X/6EG24N9K4 R900924480 4WEH16J7X/6EG24N9S2K4
R900924557 H-4WEH16J7X/6EG24N9ETS2K4/B10D3 R900924558 H-4WEH25D6X/6EG24N9ES2K4/B10D3
R900924563 4WEH16D7X/6EG24N9K4/B08 R900924643 4WEH16L7X/6EG24N9ETK4
R900924733 4WEH16Q7X/6EG24N9K4 R900924764 4WEH16J7X/6EW230N9ETK4/B08
R900924874 4WEH16D7X/6EG24N9ETK4/B10 R900924880 4WEH16HD7X/OF6EG24N9ETS2K4
R900924940 4WEH16Q7X/6EG24N9ES2K4 R900924976 4WEH22E7X/6EW230N9K4
R900925313 4WEH16D7X/6EG24N9S2K4 R900925558 4WEH16D7X/6EG24N9ES2K4
R900925571 4WEH16U7X/6EG24N9ETK4 R900925580 4WEH16J7X/6EG24N9K4
R900925597 4WEH16D7X/6EG24N9EK4 R900925957 4WEH16Y7X/6EG24N9ETK4
R900926347 4WEH16J7X/6EG24N9S2K4/B08 R900926505 4WEH16J7X/6EG24N9K4/V
R900926575 4WEH10D4X/6EG24N9ETK4 R900926585 4WEH16HD7X/OF6EG24N9K4
R900926595 4WEH16J7X/6EG24N9ETK4/10 R900926638 4WEH16J7X/6EG24N9ETK4/B10D3
R900926682 4WEH16J7X/6EW110N9ES2K4 R900926695 H-4WEH25J6X/6EG24N9ETS2K4/B10D3
R900926787 4WEH22J7X/6EG24N9ETK4 R900926896 4WEH32E6X/6EG24N9ETK4