本品牌Northman北部精機產品包括電磁閥，機械換向閥，手動閥，單向閥，充液閥，
邏輯閥，溢流閥，減壓閥，順序閥，背壓閥，節流閥，調速閥，流量閥，
比例閥，壓力繼電器，柱塞泵，葉片泵，齒輪泵，壓力表開關等液壓附件

螺絲旋上螺母，用規定的扭矩擰緊螺母。經測試后，須在規定的扭矩范圍內重新擰緊螺母，以達到足夠的預緊度。
壓力調整 調整壓力時，放松鎖緊螺母，慢慢轉動手柄，順時針為壓力升高，逆時針為壓力降低，調整完畢，不要忘記擰緊鎖緊螺母。
產品的詳細介紹：
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
20和40分別代表零件式和插件式
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