A loader(lift truck) air cylinder vent valve is a valve that is used for the air reservoir of a loader(lift truck), which is a type of heavy machinery that can load and move materials. The function of the vent valve is to automatically open the vent port when the air pressure in the reservoir reaches a certain value, and discharge the excess gas, keeping the pressure in the reservoir constant, and preventing overpressure hazards. The structure of the vent valve usually consists of a valve body, a spring, a steel ball, and an adjusting bolt. The valve body has a vent hole, and the spring and steel ball can control the opening and closing of the vent hole. When the air pressure in the reservoir is lower than the pre-tension force of the spring, the steel ball is pressed against the vent hole, preventing gas leakage. When the air pressure in the reservoir is higher than the pre-tension force of the spring, the steel ball is pushed open, and gas is discharged from the vent hole, reducing the pressure in the reservoir. The adjusting bolt can be used to adjust the pre-tension force of the spring, and change the pressure value limited by the vent valve.

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