Hydraulic pumps

Hydraulic electric pumps: centrifugal, submersible, self-priming, close-coupled ... a type for each function.

The applications of hydraulic electric pumps are many, because there are many situations in which it is necessary to use a device to ensure the supply of water and its handling.

Whether it's taking water from a well or circulating it in pipes, irrigating land or purifying a swimming pool, you can't do without a pump. And the examples could be countless others, whether we think of civil uses or industrial plants where the use of water is required. There are therefore different types of pumps, each of which responds to a specific function thanks to the particular construction structure and the characteristics of its components:

Close-coupled and self-priming pumps

Centrifugal pumps are the most commonly used pumps and move water through centrifugal force. They exploit the motion of the impeller to transform the mechanical energy of the motor into kinetic energy and therefore into pressure energy.

Centrifugal pumps can be close-coupled, i.e. made with direct coupling between motor and pump body, in order to guarantee maximum compactness. They can also be self-priming. In this case, it is sufficient to fill the pump with liquid at the first start and the turbulence generated by the impeller creates a depression that allows air to be sucked into the duct; when all the air is expelled from the delivery port, the water begins to circulate and the pump is primed.

How to size the pumps: flow rate and head

The main parameters to be taken into account for the sizing of an electric pump are the flow rate and the head. The flow rate indicates the amount of water that the pump is able to move in a given unit of time, the head indicates the difference in level that the water can overcome thanks to the action of the electric pump. Another important parameter is that of the performance which corresponds to the ratio between the power supplied and the power actually used. The pump performance curve has a maximum point which corresponds to the ideal flow rate of that pump. For this reason, correct sizing of the machine is essential, so that it can operate while staying close to the point of maximum efficiency.

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