DOUBLE TUBE TYPE VARIABLE PRESSURE QUANTITATIVE WATER SUPPLY SYSTEM

PURPOSE:To raise the performance of water supply by concentrating effective water supplying pressure on the position of strainer by a method in which water to be sent back to the underground is injected back to the ground from the lower part of a casing pipe through a water supply pump, a valve and a water injection pipe. CONSTITUTION:Water to be sent back to the underground is pressurized by a water supply pump 6 set in a water supply tank 1 and supplied into the ground through a filter 5, a strainer (opening) 4, and a casing pipe 3 from a water supply pipe 2, a valve 7 and a water injection pipe 9. By injecting water from the tip of the water injection pipe 9, or from the lower part of the casing pipe 3, effective water injection pressure is concentrated on the position of the strainer (opening) 4, and the performance of water injection is raised. By the valve 7 and the pressure guage 8, the injection pressure of water can be regulated according to the ground.