Powerful magnetic pipeline filter from the device by the high coercivity magnetic materials with a strong combination of blocking filters, magnetic adsorption force is ten times normal, with the instantaneous flow or high velocity impact condition, the adsorption micron the capacity of ferromagnetic contaminants, and overcome major impact in the high-speed rail under the magnetic impulse re-adsorbed pollutants to live to avoid death of the hydraulic components of the card when the wear and friction, hydraulic components and hydraulic system to extend the use of life, enhance the reliability of hydraulic system. In the electro-hydraulic servo system and the application of electro-hydraulic proportional system, the effect is very obvious.