No separation between air and water inside tanks. The energy stored in the form of pressurised air in the accumulator drives the water to the mains. When the minimum pressure value is reached, the pump will be start, generating a depression that will solve the injector by taking air from the outside progressively until reaching the maximum pressure value established. In this moment, we will have the surge vessel with the maximum volume of water and the pump will stop.

As water consumption increases, the air remaining in the injector chamber is progressively brought into the tank as a result of the depression produced within the tank when the water level is lowered to stabilise the pressures between suction and drive.

When selecting the volume of the bladderless hydropneumatic accumulator on the IMPULSE side of the pressure group, the following equivalence is established with bladder hydropneumatic accumulators: