4.2.2 Ball valve: operating principle ѓ During the water fill and washing phases, the sphere is raised by the water contained in the drain circuit to the uppermost position, thus preventing water from passing between the tub and the filter body. To ensure correct operation of the system, it is important to ensure that the drain hose is always correctly connected to the corresponding support on the rear panel (at a height of at least 60 cm.). ѓ During the drain phases, the suction effect created by the operation of the pump causes the sphere to move downwards, thus allowing the water to flow through the drain circuit. SOI/DT 2002-05 eb 23 599 35 23-17