We use it extensively in buildings, to keep the pressure at the outlet constant, when demand constantly changes and the pressure in the system must be kept constant. In fountains to raise and lower the water jets. It is also used to adjust the operational working point of the pump to the water demand.  

A frequent application where it is used is in the control of the jets in water fountains, where it receives a signal from a programmable dmx controller and the height of the jets is changed according to the programming.

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