箭型止回阀    

Type Arrow Back Pressure Valve

    FJ型箭型止回阀是钻井过程中一种重要的放喷工具。该工具同其它结构的止回阀相比，具有强度高、过流面积大、耐高温、耐高压、耐钻井液冲蚀和维修方便的特点。

FJ type Arrow pressure valve is a important tool in preventing of blowing out in driling operation.Comparting to other structural valves it posses some advantage such as high strength Big flowa area,high temperature resistant,high pressure resistant,snd easily maintenance.