What is the structure and working principle of stainless steel pressure tanks?

2026-08-25 17:08:23

What is the structure and working principle of stainless steel pressure Tanks?

A pressure tank is actually very simple. It has a shell with an inflatable rubber bladder inside. The purified water produced by the water purifier enters the pressure tank, compresses and expands, generating pressure. As soon as the faucet is turned on, the water is squeezed out by this pressure. So, what is the structure and working principle of a stainless steel pressure tank?

What is the structure and working principle of stainless steel pressure tanks?

1. The structure and working principle of a pressure tank. The pressure tank is mainly composed of a valve cover, an inflation port, an airbag, a carbon steel tank, and a flange. When it is connected to the water system, it mainly functions as an accumulator. When the system water pressure is greater than the nitrogen pressure between the carbon steel tank airbags of the expansion tank, the system water will be squeezed into the airbags of the expansion tank under the action of the system pressure, thereby compressing the nitrogen between the airbags, reducing their volume and increasing their pressure. It will increase the overall water capacity of the system, reduce the system pressure, stop water intake until the system water pressure reaches a new equilibrium with the nitrogen pressure between the tank and airbag.

When the system water pressure is lower than the gas pressure in the expansion tank, the water in the airbag will be squeezed out by the pressure of nitrogen between the tank and airbag, thereby compensating the system. The volume of water in the system will decrease and the pressure will increase, while the volume of nitrogen between the tank and the gas bag will increase and the pressure will decrease until a new equilibrium is reached, at which point water will stop being squeezed back into the system from the gas bag. The pressure tank will play a role in regulating system pressure fluctuations.

Due to the regulating effect of airbags, pressure tanks are widely used for controlling small-scale pressure fluctuations in water systems. Pressure tanks are used in hot water heating systems, mainly to eliminate pressure fluctuations caused by changes in water temperature and avoid damage to other system control components. If applied to variable frequency water supply, it can eliminate pressure fluctuations caused by pump start stop, reduce the number of times the variable frequency pump is started, and greatly extend the service life of the pump. If applied to civil building water supply or other water supply equipment, it can eliminate the water hammer effect caused by the opening and closing of other valves and protect the entire system from water hammer impact.

What are the types of stainless steel pressure tanks?

Types: Gas supply type and diaphragm type.

1. The air in the air pressure tank comes into direct contact with water. After a period of time, the air decreases due to leakage and dissolution in water, gradually reducing the amount of regulated water. The start-up of water pumps is becoming increasingly complex and requires regular air replenishment. The gas supply methods include air compressor, water spray, timed exhaust, etc.

2. The diaphragm pressure tank separates gas from water. The water is in a rubber (plastic) bag, and the gap between the outside and the water tank is pre filled with an inert gas, usually nitrogen. This type of pressure tank has no loss of air solubility or moisture, can be inflated once, and can be used for a long time without the need to install an air compressor. Therefore, it saves investment, simplifies the system, and expands the scope of application.