力士乐液控单向阀SL20PA1-4X，武汉百士自动化设备有限公司供应产品，现货库存，原厂原装，质量保障，价格优惠；移动电话：15307180902，商务QQ：980227448，传真：027-87680708-608，联系人：雷青；欢迎新老客户咨询购买！
方向控制阀
类型:单向阀、换向阀
一、单向阀
类型:普通单向阀、液控单向阀
1、普通单向阀
作用:只允许油液沿一个方向流动，不允许油液反向倒流(起止回作用)
对单向阀的性能要求:
(1) 正向导通时，压力损失要小;
(2)反向截止时，密封性要好。
2、
液控单向阀
作用:
(1)起止回作用;
(2)必要时解除逆止，允许油液反向通过。
3、单向阀用途
(1)止回作用:安装在泵的出口，p.=0.3~0.5 bar
(2)作背压阀用:防止液压缸前冲或爬行，使系统作平稳。
(3)作锁紧装置用:起重机支腿、夹紧回路等。
(4)保持控制油路有必要的压力: Pr≥P液挖
(5)作复合阀使用:单向节流阀、单向顺序阀、单向减压阀、单向调速阀等。
(6)局部回路作安全阀使用: Ppr>P换热器正常工作的距力
二、换向阀
作用:
利用阀芯相对于阀体间的相对位置改变，使油路接通、关断，或改变油流的方向，从而使液压执行元件启动、停止或变换运动方向。
1、对换向阀的性能要求
(1)油液导通时压力损失要小;
(2)油液断开时泄漏要小;
(3)阀芯换位时操纵力要小。
2、类型
按阀芯的形状分类滑阀{包括控制部分、主体部分(位、通)}、转阀
按阀的安装方式分类:管式、板式、法兰式。
按操纵方式分类:
手动、机动、电动、弹簧控制、液动、液压先导控制、电液动等。
3、换向阀主体结构与工作原理
几种典型换向阀的结构
1、手动换向阀
2、机动换向阀，又称行程阀。
它是借助于安装在工作台上的挡铁或凸轮来迫使阀芯移动。通常是二位的，有二通、三通、四通和五通几种，其中二位二通机动阀又分常闭和常开两种。
③电磁换向阀
工作原理:
利用电磁铁的通电吸合与断电释放而直接推动阀芯来控制液流方向的。
类型:
交流(D,36V或220V或380V)
直流(E,24V或100V )
干式、湿式
交流电磁铁:使用电压为交流110、220、380V。特点是启动力较大，不需要专门的电源，吸合、释放快，动作时间约为0.01 ~0.03s。缺点是电源电压下降15%以上，电磁铁吸力明显减小，若衔铁不动作，干式电磁铁会在10~15min (湿式1~1.5h) 后烧坏线圈，且冲击及噪声较大，寿命低，允许切换频率为10次1分。
直流电磁铁:使用电压为直流110和24V,工作可靠，吸合释放时间约为0.05~ 0.08s,切换频率般为120次/分，冲击小、体积小、寿命长，但需要专门的直流电源，成本较高。
交流本整型电磁铁:电磁铁是直流的，电磁铁本身带整流器，通入交流电经整流后再供给直流电磁铁。
干式电磁铁:电磁铁线圈、铁芯与轭铁处于空气中而不和油液接触。电磁铁与阀连接时，在推杆处设置密封圈，避免了油液进入电磁铁，而且装拆方便。为了防止回油进入干式电磁铁中，要求换向阀的回油压力不能太高。
湿式电磁铁:湿式电磁铁的推杆与阀芯连成一体,取消了推杆处的动密封，所以摩擦力小，复位性能好，冷却润滑好，工作寿命长。
特点:
(1)动作迅速，操作轻便，便于远距离控制;
(2)因受电磁铁尺寸与推力的限制，仅能控制小流量(小于63 L (min)的液流;
(3)电磁铁通断电需电信号控制:如设备中的按钮开关、限位开关、行程开关等;
(4)换向快，易产生液压冲击。
力士乐液控单向阀SL20PA1-4X
力士乐液控单向阀SV 10...32
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力士乐REXROTH液控单向阀SL 6
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液压传动技术在机械中的应用.
驱动机械运动的机构以及各种传动和操纵装置有多中形式。根据所用的不见和零件，可分为机械的、电气的、气动的、液压的传动装置。经常还将不同的形式组合起来运用一四位一体。由于液压传动具有很多优点，使这种新技术发展的很快。液压传动应用与金属切割机床也不过四五十年的历史。航空工业在1930年以后才开始采用。特别是最近二三十年一来液压技术在各种工业中的应用越来越广泛。
1、在机床上，液压传动常应用在以下的- -些装置中
1.1进给 传动装置磨床砂轮架和工作台的进给运动大部分采用液压传动;车床、六角车床、自动车床的刀架或转塔刀架，铣床、刨床、组合机床的工作台等的进给运动也都采用液压传动。这些部件有的要求快速移动，有的要求慢速移动。有的既要求快速移动，也要求慢速移动。这些运动多半要求有较大的调速范围，要求在工作中无级调速;有的要求持续进给，有的要求间歇进给;有的要求在负载变化下速度恒定，有的要求有良好的换向性能等等。所有这些要求都是可以用液压传动来实现的。
1.2往复主题运动传动装置龙i刨床的工作台、牛头刨床或插床的滑枕，由于要求作高速往复直线运动并且要求换向冲击小、换向时间短、能耗低，因此都可以采用液压传动。
1.3仿形装置车床、铣床、刨床上的仿形加工可以采用液压伺服系统来完成。起精度可达0.01-0. 02m。此外，磨床上的成型砂轮修正装置亦可采用这系统。
1.4 辅助装置机床上的夹紧装置、齿轮箱变速操纵装置、丝杆螺母间隙消除装置、垂直移动部件平衡装置、分度装置、工件和刀具装卸装置、工件输送装置等，采用液压传动，有利于简化机床结构，提高机床自动化程度。
1.5静压支承重型机床、高速机床、高精度机床上的轴承、导轨、丝杆螺母机构等处采用液压静支承后，可以提高工作平稳性和运动精度。
2、液压传动技术在工程机械行走驱动中的应用
行走驱动系统是工程机械的重要组成部分。与工作系统相比，行走驱动系统不仅需要传输更大的功率，要求器件具有更高的效率和更长的寿命，还希望在变速调速、差速、改变输出轴旋转方向及反向传输动力等方面具有良好的能力。于是，采用何种传动方式，如何更好地满足各种工程机械行走驱动的需要，-直是工程机械行业所要面对的课题。尤其是近年来，随着我国交通、能源等基础设施建设进程的快速发展，建筑施工和资源开发规模不断扩大，工程机械在市场需求大大增强的同时，更面临着作业环境更为苛刻、工沉条件更为复杂等所带来的挑战，也进一步推动着对其行走驱动系统的深入研究。
力士乐REXROTH液压元件应用行业：注塑机、吹塑机、橡胶和发泡机、陶瓷压机、同步折弯机(折板机),、剪板机(剪床）、冲切/步冲、金属压力机、弯曲/锯床、机床、食品机械、皮革/鞋机、木材/造纸机械、钢铁业/铸造、压铸机/挤压机、电厂、生态能源（风能-水力-太阳能）设备、油和天然气工业设备、混凝土泵、路机、钻井/开采设备、起重机、升降机/叉车、推土机、道路，隧道，水坝工程设备、压缩机、街道维修设备、模拟器/娱乐设备、卡车、铁路工程设备、航空工业设备、船舶/航海工业设备、打谷机/喷洒机、拖拉机/收割机。
