For mine hydraulic support, oilfield development, engineering construction, petroleum transportation, metallurgy, shipbuilding, mining equipment forging, injection molding machinery, agricultural machinery, machine tools and various industrial sectors of mechanization and automation of hydraulic system to transport a certain pressure and temperature (such as mineral oil, soluble oil, hydraulic oil, fuel oil, lubricating oil) and water-based liquid (such as emulsion, water emulsion, water pipe and liquid transmission).