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利用轻烃与水密度的不同，制造一种浮子，使其在游离水中受到向上的合力，在轻烃中受到向下 的合力，利用其向上的合力和向下的合力打开与关闭轻烃游离水排放阀，以实现轻烃游离水在密闭 排水系统中的可控排放或自动排放。
Utilizing the difference of light hydrocarbon and water density, a float is made, which is subjected to an upward force in free water, a downward resultant force in light hydrocarbons, and its upward combined force and downward force open and close the light hydrocarbon free Water discharge valve to achieve controlled discharge or automatic discharge of light hydrocarbon free water in closed drainage system.