Cookies help us deliver our services. By using our services, you agree to our use of cookies. Learn more


08 10 2022
What is pressure tank do in a water system? |Aquasky

It stores water and provides water under pressure when the pump is not running. It builds up a reserve supply of water so the pump starts and stops less often, prolonging the life of the pump. In addition, it provides a reserve supply of water for use during times of high demand.

Since 1970, most water systems have used diaphragm-type pressure tanks. The diaphragm is usually made of butyl rubber. The water is contained in the water zoom which is made by the diaphragm and the tank liner. It does not come in direct contact with the air in the tank. The diaphragm holding the water expands into the pressurized air space in the tank as it is filled. As water is used from the system, the diaphragm collapses until the water is almost emptied before the minimum pressure is reached, which activates the pump. They are pressurized at the factory (typically around 30 psi) but the pressure can be adjusted using an air valve located near the top of the tank. Because there is almost no water left in the bladder at the pressure when the pump is turned on, these tanks may not be suitable for low-yield wells unless an additional tank is used.


The operation of a pressure tank is based on physical properties. Water cannot be compressed into a smaller area, while air can. When water is pumped into a tank containing air, the air is compressed, putting the water under pressure. The more the air is compressed, the greater the water pressure. When the water reaches a pre-set pressure, the pump automatically shuts off. As water is used, the pressure in the tank is lowered. When the water reaches a pre-set pressure, the pump starts again. The minimum tank pressure must be at least as high as the pressure needed by any water-using fixture or appliance.


The water pump and pressure tank work together to get the water from the water table to your home. The well pump pulls or pushes — depending on the type of pump — the water from the well, sending it to the pressure tank, which holds the water under pressure until something in your plumbing system is turned on. The pressure tank creates pressure with a portion of its tank filled with compressed air.


When a water valve is opened within your home’s plumbing, the tank pushes out the water through the piping and then only fills up again when the pressure in the tank falls below a specific pressure rating. By having the pressure tank hold a significant amount of water, there is less wear and tear on the well pump because it doesn’t have to cycle on and off as often. Since well pumps are a bit more work to repair and replace, the pressure tank, specifically the right size of a pressure tank, is an important component of a well water system.


Aquasky PUMPLUS provides a total solution pressure tank from small as 3L to 450L pressure tanks covering the residential and commercial areas. Please feel free to contact Aquasky for more information.