| 摘要 |
PURPOSE: A residual water drainage system for preventing a tube well facility on an underground water upper protective hole from freezing and bursting is provided to prevent a tube well facility from freezing and bursting by completely draining underground water and preventing an electric leakage and damage due to a lighting strike by excluding the use of electricity. CONSTITUTION: A residual water drainage system for preventing a tube well facility on an underground water upper protective hole from freezing and bursting comprises a water pipe, a drainage branch (20), a valve housing (30), a piston valve (40), a valve plug (50), and an elastic member (60). The valve housing is connected to the bottom end of the drainage branch and is formed with a valve operation chamber (31) and a plug joint (32) inside. The piston valve is inserted in the valve operation chamber to be vertically movable. The valve plug blocks the plug joint. The valve plug is successively formed with a valve seat surface (51) and a drainage way (52). |
