We offer Condensate Drain Valve with Zero Air Loss Function that is a complete solution to drainage concerns of many industries, such as chemical and oil refinery factories. It is the management system where conventional drainage system is intercepted by a water control structure, which effectively function as an in-line dam, allowing the drainage outlet to be artificially set at levels ranging from the soil surface to the bottom of the drains. We offer two major systems where in first, water level is controlled with structures by adding or removing logs or using float mechanism to control the opening and closing of a flow valve.