How does a water supply system work?

Isn’t the principle of water supply based on pumps? Same question

The working principle of water supply equipment is as follows: (Since many people consider water supply equipment to be nothing more than water pumps, it can also be described as operating on the principle of pumps.) When the pressure sensor at the outlet of the equipment detects that the pressure there is not sufficient to meet the requirements of the point in the system where water is needed the most, the control system automatically activates the variable-frequency speed-control pump set to start operating. At the same time, as the output frequency of the water supply equipment increases, the motor speed of the variable-frequency speed control pump set also increases. When the outlet pressure sensor detects that the supply pressure has reached the system’s set value (a parameter predetermined in advance), the motor speed stabilizes and the system reaches equilibrium. When the amount of water used by the user increases, the pressure at the outlet of the device drops. The motor is unable to maintain the set system parameters, resulting in a disruption of the system’s balance; there is a deviation between the system pressure and the set value. The water stored in the high-pressure chamber quickly flows toward the outlet, causing the system pressure to drop gradually. At the same time, the automatic closed-loop speed control system in the frequency conversion control cabinet sends a signal to increase the output frequency of the frequency converter, thereby raising the motor’s speed rapidly to the system’s set pressure value, and thus achieving a new balance. When the user's water consumption decreases, the pressure rises to the upper limit, causing the variable-frequency speed-regulated pump to operate at a reduced speed. As the water consumption by the user continues to decrease, the frequency of the variable-frequency drive pump gradually drops. When the frequency falls below the minimum value, the variable-frequency drive pump stops operating, and the pump that operates at fixed frequency switches to variable-frequency operation. If water consumption decreases further and the frequency of the variable-frequency drive pump has dropped to the sleep frequency, after a certain delay, the inverter enters sleep mode. The variable-speed pump stops rotating immediately, and the equipment enters a dormant state. The variable frequency control cabinet continuously monitors changes in the water pressure sensor; when the pressure at the outlet of the equipment falls below the preset activation pressure value, the inverter restarts operation. When the output frequency of the frequency converter reaches its maximum value, the motor speed corresponds to its rated speed; and when it is no longer possible to adjust the parameters accordingly, the variable-frequency drive pump switches to operating at the mains frequency, while another variable-frequency drive pump starts up using frequency conversion, thereby continuing to maintain stable system pressure. Finally, when the water supply volume from the water supply network exceeds the demand of the users, the system uses the CA end of the bidirectional compensator to enable the variable-frequency speed-controlled pump set to store water in the high-pressure chamber of the pressure-stabilizing compensation tube. When this high-pressure chamber performs pressure stabilization and compensation for the user’s water networks, it stores energy in the energy storage device. When the water supply volume from the water supply network is less than the users’ demand, the water stored in the high-pressure chamber of the pressure-stabilizing compensation tank, thanks to the release of energy from the energy storage device, causes the water level in that chamber to drop to a set low level; at this point, the variable-frequency speed-controlled pump stops operating, and the equipment automatically enters a shutdown protection mode.