Device enabling a fluid dispenser to operate both the rightway up and upside-down

A device enabling a fluid dispenser to operate equally well in the upside-down position and in the rightway-up position to dispense a fluid having a predetermined density, the dispenser comprising a fluid tank and a dispenser member such as a pump or a valve, the dispenser member having an inlet and a dip tube extending into the tank, said device being disposed between the inlet of the dispenser member and the dip tube, said device comprising a chamber in communication with said inlet of the dispenser member, said chamber comprising a top inlet and a bottom inlet selectively closable respectively by a top check valve and by a bottom check valve as a function of the upside-down position or the rightway-up position of the dispenser, the top check valve having a moving valve element adapted to close the top inlet of the chamber in the rightway-up position, wherein the bottom check valve has a moving valve element that floats in said fluid and that has a density that is less than said predetermined density of said fluid, said moving valve element being adapted to close the bottom inlet of the chamber in the upside-down position when the chamber is full of the fluid.