| 摘要 |
An auto drain valve of an air tank large vehicle in a large vehicle is provided to prevent continuous air leakage by opening a bypass valve to equalize pressure between an upper space and a lower space when the pressure in the upper space lowers below a set value. An auto drain valve of an air tank large vehicle in a large vehicle comprises a valve housing(1), a diaphragm(2), a pin rod(3), a bypass passage(5), and a bypass valve(6). The inner space of the valve housing is divided to an upper space(1b) and a lower space(1c) by the diaphragm and a discharge path(1a). The protruded lower end of the diaphragm opens and closes the discharge path. The pin rod is inserted into the discharge path of the diaphragm. The bypass passage is bored through the wall of the valve housing to connect the upper space and the lower space. The bypass valve is located at a bypass passage outlet at the lower space to be opened when the pressure of the upper space lowers below a set value. |
