臺灣northman北部精機
疊加式溢流閥MRF
訂貨型號如下：
其中P，A，B，C和D代表溢流閥控制油路
P:P孔  A:A孔  B:B孔  C:A&B串聯 D:A&B并聯
其中K代表附塑料旋鈕，沒有K代表未附旋鈕
其中1-4代表壓力調節范圍
1:8-70bar  2:35-140bar  3:70-210    4:210-250 
最后20和40分別代表零件式和插件式
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