| 摘要 |
PURPOSE: A water supply system for keeping water pressure is provided to reduce inconvenience on water service caused by low water pressure and to improve safety and convenience on maintenance for a water supply system. CONSTITUTION: The water supply system for keeping water pressure comprises a closed water tank for storing water, a water supply pipe for letting water flow in the water tank, a drain pipe for supplying water of the water tank to the outside, a valve device installed to the water supply pipe and the drain pipe to control the circulation of water with the water tank, and an air valve installed to the uppermost part of the water tank to control an inflow/outflow of the outside air.
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