What should be the air pressure in the air cavity of the hydraulic accumulator?

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It is important to understand that the hydraulic accumulator does not create any pressure and does not pump water to the consumer itself - the pump does all this. It only maintains the liquid pressure that is created in it by the pump and supplies water at the time when the consumer's tap is open and the pump is not turned on. For example, the question "What volume of hydraulic accumulator do I need if I have two showers?" is not entirely correct. Because when using a shower (one or two), the hydraulic accumulator supplies water only until the pump is turned on, and then for the rest of the time of use, only the pump supplies water. And it will stop only after all the taps are closed and the pressure in the tank rises to the shut-off pressure.

Sometimes it happens that the pump switches off even when latvia mobile database are using water. However, such an operating mode is undesirable (since after a short time the pump will have to switch on again) and indicates that the pump selection and/or the settings of the entire system are incorrect (in most such cases, the pressure switch settings need to be changed).

Any hydraulic accumulator is divided by a membrane into two cavities: air and water. Due to the supply of water under pressure into the water cavity of the tank, the membrane expands and compresses the air in the air cavity. Thus, the membrane is balanced by the pressure on both sides (P1V1 = P2V2). The pressure will increase until the pump is switched off according to the pressure relay setting (pump switch-off pressure). At the moment the water consumption starts, the air presses on the membrane, thereby pushing the water out of the hydraulic accumulator. The water pressure slowly drops and when the pump switch-on pressure is reached, the relay closes the contacts and the pump starts. This is the basic diagram of the automatic operation of the pump together with the hydraulic accumulator and the pressure relay.

The pressure in the air cavity of the hydraulic accumulator should be 10% less than the pump start pressure.

Moreover, the air pressure should be measured only on a tank disconnected from the system (without water pressure). The air pressure should be regularly monitored and, if necessary, brought to normal, this will significantly extend the life of the membrane. For the same purpose, it is not recommended to make the pressure difference between turning the pump on and off too large. The optimal difference is 1.0-1.5 atm. Larger differences stretch (load) the membrane more, thereby reducing its service life, and moreover, large pressure differences are not comfortable when using water.