The top loading arm is an articulated piping supported by a mechanical balancing (torsion or compression spring) or pneumatic system, which is used to transfer fuels or industrial liquids in tankers and railway tanks through the top manholes. For every kind of need relating to the loading area, different types of products can be configured with variable range of action and with flow entry direction from above and below. Top loading arms are equipped with a flow valve initiated with pre-opening and closing speed adjustment system. Otherwise, either a ball valve or other types of valve can be mounted according to the user's needs