先导式溢流阀DB20K2-1X/315XY

先导式溢流阀DB20K2-1X/315XY，力士乐REXROTH溢流阀，上海韦米机电设备有限公司主要优势供应产品，销售热线： ，联系人：雷青，移动热线： 。热诚欢迎新来客户咨询购买！

 

先导溢流阀的主阀上腔压力，是由先导阀加于控制的。如果先导阀正常工作，即主阀上腔有先导阀规定的压力，则整个溢流阀就会在系统压力到达调定压力时其主阀口打开一定的开度，一方面能将系统多余流量流回油箱，另一方面又能维持系统的压力为先导阀的调定值。可见，先导阀主要管压力，主阀服从先导阀的领导，在先导阀动作时将主阀口开到合适大小，正好将多余流量流出去，又不影响系统压力。

比例阀是一种具有伺服阀和开关阀某些特点的新型阀。比例阀与伺服阀相比具有能量损耗小，对油液过滤精度要求低，价格适中等优点，因而逐步在国内锻压机械上得到推广应用。
在板料折弯机上应用的比例阀主要是比例溢流阀和比例调速阀。比例溢流阀一般控制板料折弯机的折弯压力；比例调速阀主要用作控制板料折弯机滑块的同步和进深。比例阀在板料折弯机上应用时常与计算机控制技术相结合，成为电液比例控制同步的数控板料折弯机，即液压同步数控板料折弯机。
先导式溢流阀DB20K2-1X/315XY
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先导式溢流阀DB20K2-1X/315XY


比例溢流阀的压力控制阀
比例溢流阀的特点是调定的压力与输入电流大小成正比，即输入的电流大，调定的压力高。
当通过计算机键盘输入被折板料的抗拉强度，厚度，长度以及下模V型槽开口宽度后，计算机按折弯力计算公式求得所需折弯力，经数模转换后，通过控制比例溢流阀的电控器，向比例溢流阀输入适当的电流值，从而达到控制折弯力大小的目的。板料折弯机所需*小折弯力和允许的*大折弯力要与比例溢流阀的压力特征曲线相对应，并且使调定的压力稍大于所需折弯力，以利于板料的顺利折弯。
比例溢流阀的压力控制一般为开环，如接入压力传感器，可进行闭环控制。

比例调速阀的同步控制
比例调速阀的特点是调定的流量与输入电流大小成比例。即输入电流大，调定的流量也大。板料折弯机在负载或者偏载工况下，要求滑块在工作速度折弯工件时，始终与工作台保持平行运动，称为同步。采用计算机控制的电液比例同步控制系统由工业控制微型计算机，光栅检测装置，比例调速阀等器件组成。
先导式溢流阀DB20K2-1X/315XY
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