Shanghai Wei-Mi Techonology Co., LTD
主营:REXROTH电磁阀,ATOS比例阀,PARKER柱塞泵,DUPLOMATIC齿轮泵,VICKERS叶片泵,BENTLY传感器,AIRTEC机械阀,AVENTICS气动阀
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LFA25RF-7X REXROTH插装阀 德国博世力士乐REXROTH插装阀 插装电磁阀
库存大量REXROTH柱塞泵A10VSO,齿轮泵PGH4\5,PGF1/PGF2/PGF3,电磁阀4WE,电子变量泵SYDFEE-2X,电液比例控制阀0811,电液换向阀4WEH、4WE,减压阀DR10、DR20、叠加阀ZD、Z1S、Z2S,ZDR电磁溢流阀DBW,直动式溢流阀DBD、0532,先导溢流阀DB10、DB20,电磁球阀M-S、M-3S,力士乐电液比例控制阀\放大器、压力继电器0811,伺服驱动,电机
LFA25RF-7X REXROTH插装阀
结构原理
主要零件有阀芯、阀体和螺母。阀体上右边是进油口,左边是出油口。阀芯一端开有三角尖槽,另-端加工有螺纹,旋转阀芯即可轴向移动改变阀口过流面积。为平衡液压径向力,三角槽须对称布置。
调速阀定差减压阀与节流阀串联而成,用来调节通过的流量自动补
偿负载变化的影响。
特点:
阀芯为锥阀,密封性能好,且动作灵敏;
通流能力大,抗污染;
一阀多用,易组成各式系统,结构紧凑。
特别对大流量及非矿物油介质的场合,优点更为突出。
插装阀基本组件由阀芯、阀套、弹簀和密封圈组成。根据用途不同分为方向阀组件、压力阀组件和流量阀组件。
插装阀的应用
单向阀
将方向阀组件的控制口通过阀块和盖板上的通道与油口A或B直接沟通,可组成单向阀。
二通阀
由一个二位三通电磁滑阀控制方向阀组件控制腔的通油方式,可组成二位二通阀。
三通阀
由两个方向阀组件并联而成,对外形成-一个压力油口、-一个工作油口和一一个回油口。三通插装阀的工作状态数取决于先导换向阀的工作位置数。
四通阀由两个三通阀并联而成。
叠加阀以板式阀为基础,每个叠加阀不仅起到单个阀的功能,而且还沟通阀与阀的流道。换向阀安装在上方,对外连接油口开在下边的底板上,其他的阀通过螺栓连接在换向阀和底板之间。
LFA25RF-7X REXROTH插装阀
泄压功能
用于泄压功能的插装阀 (1)(类型 LC . DB...)设计为无面积差的座阀(B 口无有效面积)。油口 A 的有效压力通过先导供油孔 (5) 引导至元件的弹簧侧 (6)。在先导控制阀 (4) 设置的压力下,阀芯 (3) 进行压力补偿并由弹簧力关闭。
达到设定压力后,阀芯 (3) 打开,端口 A 的压力根据压力-流量特性进行限制。
减压功能
休息位置关闭
对于具有开启特性的减压功能,应用了限压插装阀(LC..DB40D...型)和带减压先导控制阀(LFA..DR...型)的控制盖。先导油通过供油孔和打开的先导控制阀从端口 A 导向 B 侧。
主阀芯打开,从 A 口到 B 口的流量被释放。
达到设定压力后,阀芯关闭,端口 B 的压力根据压力-流量特性降低。二次侧增加的电位压力通过先导控制阀的第三路排放到油箱。方向阀的设置可以实现附加的闭锁功能(LFA..DRW...型)。
压力排序功能
此功能可实现第二个系统的压力相关连接。
所需的切换压力在集成在控制盖中的先导控制阀上设置。
先导供油可以通过外部(先导油口 X)或内部(从 A 口经先导油口 X 或 Z2)实现。
先导控制弹簧室通过油口 Y 或 Z1 被引导,减压到油箱。
电路示例
示例 1:(低压系统的压力相关卸载电路)
在图示的回路中,系统通过高压泵和低压泵供气。系统压力p S从高压侧通过先导控制阀上的先导油口X对外作用,达到设定压力值后将低压侧设置为减压循环。止回阀 RV(不包括在供货范围内)阻止高压系统与现已减压的低压系统连接。
在达到先导控制弹簧上设定的压力时,先导控制阀被切换,主阀到油箱的弹簧腔被卸载。主阀芯打开,A 到 B 的连接被释放。
对于 LFA..DZW... 型,除了液压回路外,还可以通过电动先导控制阀选择所需的开关位置(不包括在控制盖 LFA..DZ... 的交付范围内) )。
示例 2:(用于第二个系统的压力相关连接的电路)
有了这个回路,在系统1的压力达到规定值之前,系统2是不连接的。先导油从主阀A口内部排出。
LFA25RF-7X REXROTH插装阀型号
力士乐REXROTH二通插装阀、定向功能,控制盖板LFA..RF
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力士乐REXROTH二通插装阀、定向功能,控制盖板LFA..WEA
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电磁阀线圈的额定电压有DC12V、DC24V、AC24V(50/60Hz)、AC110V(50/60Hz)、AC220V(50/60Hz)、AC380V(50/60Hz)。一般在电气设计时要么采用AC220V(不需加装开关电源,成本低、线路简单而便于维护)、要么采用DC24V(常用的的安全电压、开关电源/电磁阀线圈都易于维修更换)。
检测电磁阀好坏的方法:先给电磁阀通上被控制的介质(带压力的液体、气体<空气>,压力值为电磁阀使用压力范围的中间值),再给电磁阀线圈通电,如果被控制介质有从通到断或从断到通的状态的变化,那么电磁阀就是好的,否则就是有问题的。
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