| 摘要 |
PURPOSE: An automatic switching device of a valve for winter-breaking is provided to be installed with regard to the installation structure of raceway pipe installed at outdoor according to the simplicity of structure and the easiness of maintenance. CONSTITUTION: The device is composed of: a switching valve(5) and a drain valve(6) fixed on one side of a supporting member(3); a connecting shaft(4) connecting the valve cores of the switching valve and the drain valve on a same line to make the switching state of each valve reversibly; a branch pipe(7) connecting a raceway pipe(2) to the switching valve and provided to make the water filled in the raceway pipe drain toward the drain pipe to prevent the winter-sowing due to the freezing of the water filled in the raceway pipe exposed onto the earth's surface; and a switching piece provided to open and close the drain valve and the switching valve.
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