Detailed description the principle and equipments and steps of circuitous acid wash hydraulic pipeline with four as one phosphoric acid liquor,it is very important for acid washing large hydraulic pipelines.

• 详细阐述液压管路四合一磷化液循环酸洗法的工作原理、所需设备和具体实施步骤 ,提出了此法对大型液压管路酸洗的重要意义