| 摘要 |
PURPOSE: A water level control device of a collector well is provided to prevent continuous operation of a pump by selectively draining subsurface water collected in a water collecting pipe into a collector well only when the pressure of subsurface water in the water collecting pipe exceeds the set pressure. CONSTITUTION: A water level control device of a collector well(1) comprises a valve body(10), a piston(20), a compression coil spring(30), a pressure control unit, and a guide unit. The valve body is installed in the exit of a water collecting pipe(P) of a subsurface water drain apparatus to be located within a collector well(S). The piston opens and closes the valve body according to the pressure of the subsurface water in the water collecting pipe. The compression coil spring elastically presses the piston in the closing direction. The pressure control unit adjusts the elasticity of the compression coil spring. The guide unit guides the piston to accurately ascend and descend. |
