VALVE APPARATUS WITH A WEIGHT CONTROL SYSTEM

It is proposed a valve apparatus for use in a liquid tank, the valve apparatus comprising: - a casing defining a main chamber, the main chamber having at least one inlet orifice and at least one outlet orifice; - a float comprising a closure element, the float being movable inside the main chamber between a first position and a second position in which said at least one outlet orifice is closed off by the closure element; - a weight control system configured for controlling the weight of the float by transferring a load in and out from the float, such that the weight of the float in the second position is lower than the weight of the float in the first position.