How does the pressure tank work

The working principle of the pressure tank is based on storing the hydraulic energy of water and its subsequent use. Below, the operation of the pressure tank is explained using the most common connection scheme with a booster or well pump.

An elastic membrane hermetically separates the tank into two chambers – gas and water. The membrane can stretch in such a way that the entire volume of the pressure tank can be filled with either gas or water. The gas chamber is connected to the atmosphere through a valve, and with the help of a compressor, the initial pressure can be set. The water chamber is connected to the water supply pipeline through a flange.

Charging the pressure tank with water begins with a signal from the pressure sensor, which activates the pump when the pressure reaches the Pmin value. The pump increases the pressure in the water supply system to the maximum allowable limit Pmax and delivers a reserve volume of water to the pressure tank, during which the gas is compressed and the volume it occupies in the tank decreases. The pump is configured to switch on at Pmin and off at Pmax pressure levels.

Small water consumption, such as opening a single tap, does not trigger the pump; instead, the water is supplied by the compressed gas in the pressure tank. When the reserve water in the pressure tank is fully used and the minimum pressure is reached, the pump switches on.

On the calculation page, you will find a tool to help you determine the initial gas space pressure Pg, the pump activation pressure Pmin, and the pump shutdown pressure Pmax under specific conditions.

Warning! The pressure tank is designed for clean drinking water. It must not be used for flammable, chemically active liquids, or water containing abrasive substances and other solid particles that can cause rapid membrane wear.

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