devices, one set for operation and one set for cleaning and standby, adapting to the characteristics of continuous operation of the main engine. put the filtration device into operation or in cleaning and standby state, just operate the reversing valve handle.The dual-cylinder screen filter is characterized by: including two filtration, a reversing valve is set between the two filtration devices, the reversing valve is provided with an oil inlet and an oil outlet, a reversing handle is set on the of the reversing valve, and a drain screw plug is set on the side wall of the filtration device. The advantages of the utility model are: the effect of filtering dirt and is good, and the cleanliness of the lubricating oil is also improved, the structure is simple, the use is convenient, and the performance is stable.It is suitable thin oil lubrication systems with a nominal pressure of 0.63MPa, used to filter dirt and impurities in lubricating oil, and can also adsorb ferromagnetic fine (such particles can pass through the filter core) to avoid premature wear of the mechanical friction pair due to the internal installation of a magnetic core; it is superior to ordinary filters performance.Instructions for use1. When the pressure difference between the inlet and outlet is ≥0.05MPa, the filtration device should be stopped, the filter core and magnet should be taken out for cleaning (including the cylinder body).2. When the filtration accuracy does not meet the requirements, stop the filtration device and the filter screen.3. During the operation of the filter, do not arbitrarily rotate the reversing valve.