先導式溢流閥DB20K2-1X/315XY，力士樂REXROTH溢流閥，上海韋米機電設備有限公司主要優勢供應產品，銷售熱線： ，聯系人：雷青，移動熱線： 。熱誠歡迎新來客戶咨詢購買！

 

先導溢流閥的主閥上腔壓力，是由先導閥加于控制的。如果先導閥正常工作，即主閥上腔有先導閥規定的壓力，則整個溢流閥就會在系統壓力到達調定壓力時其主閥口打開一定的開度，一方面能將系統多余流量流回油箱，另一方面又能維持系統的壓力為先導閥的調定值。可見，先導閥主要管壓力，主閥服從先導閥的領導，在先導閥動作時將主閥口開到合適大小，正好將多余流量流出去，又不影響系統壓力。

比例閥是一種具有伺服閥和開關閥某些特點的新型閥。比例閥與伺服閥相比具有能量損耗小，對油液過濾精度要求低，價格適中等優點，因而逐步在國內鍛壓機械上得到推廣應用。
在板料折彎機上應用的比例閥主要是比例溢流閥和比例調速閥。比例溢流閥一般控制板料折彎機的折彎壓力；比例調速閥主要用作控制板料折彎機滑塊的同步和進深。比例閥在板料折彎機上應用時常與計算機控制技術相結合，成為電液比例控制同步的數控板料折彎機，即液壓同步數控板料折彎機。
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先導式溢流閥DB20K2-1X/315XY


比例溢流閥的壓力控制閥
比例溢流閥的特點是調定的壓力與輸入電流大小成正比，即輸入的電流大，調定的壓力高。
當通過計算機鍵盤輸入被折板料的抗拉強度，厚度，長度以及下模V型槽開口寬度后，計算機按折彎力計算公式求得所需折彎力，經數模轉換后，通過控制比例溢流閥的電控器，向比例溢流閥輸入適當的電流值，從而達到控制折彎力大小的目的。板料折彎機所需*小折彎力和允許的*大折彎力要與比例溢流閥的壓力特征曲線相對應，并且使調定的壓力稍大于所需折彎力，以利于板料的順利折彎。
比例溢流閥的壓力控制一般為開環，如接入壓力傳感器，可進行閉環控制。

比例調速閥的同步控制
比例調速閥的特點是調定的流量與輸入電流大小成比例。即輸入電流大，調定的流量也大。板料折彎機在負載或者偏載工況下，要求滑塊在工作速度折彎工件時，始終與工作臺保持平行運動，稱為同步。采用計算機控制的電液比例同步控制系統由工業控制微型計算機，光柵檢測裝置，比例調速閥等器件組成。
先導式溢流閥DB20K2-1X/315XY
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