An improved closeable lid for a beverage container is described. The lid uses a base, a flanged gasket, a valve and a knob to allow a user to control the flow of liquid from the beverage container. The flanged gasket surrounds the base with radially extending flanges that conforms to the interior of the beverage container, creating a seal. The valve moves vertically to engage and disengage the seal created by mating the valve face to the valve seat. The vertical movement of the valve is modulated by the rotation of a knob that is connected to the valve that provides a threaded shaft. The user can consume liquid from the beverage container as a result one or more fluid apertures through the base allowing for the passage of fluids from the beverage container past the valve and through base to the user. When the knob is rotated to the closed position, the valve creates a seal preventing the flow of liquid through the fluid apertures of the base.