Even when the impeller is turning, liquid can flow backwards if the external pressure is enough to overcome the pressure difference generated by the pump.Ī solenoid valve solves this problem, and unlike a pump, is designed to block the flow of liquid at some pressure.Ī check valve is another solution. However, a centrifugal pump is probably more common, and in these, there is nothing preventing the flow of liquid in either direction when the impeller is not turning. Some pumps might prevent this by offering no free path for liquid to flow and preventing their internal parts from turning backwards by friction. If there were no valve in the line, then when the pump is off, liquid may siphon from the higher container to the lower container until the liquid level is equal in each container.
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