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SUN valves use liquid as the working medium to transmit energy and perform control. Hydraulic transmission and pneumatic transmission are collectively known as fluid power transmission. This is an emerging technology developed based on the principle of hydrostatic pressure transmission proposed by Pascal in the 18th century, and it is widely used in industrial and agricultural production. Basic principle of SUN valves: The basic principle of hydraulic transmission is to use pressurized oil as the working medium in a sealed container to achieve energy conversion and power transmission. The liquid is called the working medium, generally mineral oil, and its function is similar to mechanical transmission components such as belts, chains, and gears.