It is a kind of lifting tool used in production. Its structure is simple, easy to operate, repair vehicles, tractors and other commonly used it will be the top of the body, easy to repair. The hydraulic jack is based on the principle of Pascal's law. It consists of the fuel tank, different sizes of the two pressure cylinder, rocker and close needle valve and other parts. When working, the small piston is lifted to suck the oil into the small pressure oil cylinder, and the oil pressure is pressed into the large pressure cylinder when the small piston is pressed. Through the control of the two valves, the small piston to the oil pressure to the large piston, the top of the heavy. The small piston can move back and forth to a certain height. After work, turn off the valve, high pressure cylinder communicated with the fuel tank. At this time, as long as a little pressure on the big piston, big piston can drop, oil back to the tank to go. QYL type vertical hydraulic jack is a new type of national stereotypes products. It has a compact structure, small size, light weight, easy to carry, it is widely used in factories, warehouses, bridges, docks, transportation and construction and other departments of the lifting operation. This product can only be used upright, the working environment temperature of -20 degrees Celsius to +45 degrees Celsius, not in the use of acid and alkali and corrosive gases.