Breather Valves: Everything in a Nutshell

Breather valves are crucial devices for the mechanical engineering industry. You can regard them as specific types of relief valves specifically designed for tank protection.

In the market, you will find different types of breather valves, such as pressure only, vacuum and combined pressure or vacuum valves.

Usually, breather valves come with flanged outlets or are vented to the atmosphere. And they are also known as direct-acting pressure or vacuum relief valves.

Breather valves find uses in bulk storage tanks on fixed roof tanks with floating covers to reduce evaporation loss.

The valves restrict the formation of excessive pressure or vacuum formation, which can unbalance the system or damage the storage vessel.

In the control mechanism of breather valves, you will find weighted pallets or springs that can be combined to provide the required pressure or vacuum levels.

Usually, people implement a common method that involves combining pallet and spring systems into one unit. In the pallet method,

In the pallet method, you need to provide a spring section to the pressure settings while using the vacuum settings in that method.

Advantages of Breather Valves

One of the advantages of a breather valve is the prevention of tanks from rupturing or imploding. So, the valves can protect the tank as a protection element.

 Usually, breather valves are mounted on a nozzle opening on the top of a fixed roof atmospheric storage tank.

There arises the possibility of a rupture of the fixed roof atmospheric tank due to the development of pressure due to the pumping of liquid into the tank or changing vapour pressure due to severe thermal changes without a controlled opening.

Without such a mechanism, the tank can implode or collapse during the pumping out procedure or thermal changes.

When the liquid level goes down, it diminishes the inside vapour pressure to below atmospheric pressure, resulting in a collapse.

But, using breather valves can help you prevent such unwanted conditions by controlling the tank’s airflow.

However, allowing the tank to breathe can negate the possibility of rupturing or imploding. The device is called a breather valve as it facilitates breathing.

Things to Consider Before Choosing Breather Valves

You should be careful before purchasing breather valves. And you should take into account the cost and convenience before choosing breather valves.

You should take into account all the essential factors beforehand, such as short and long-term performance.

These are crucial considerations, so you should not skip them. But, you might face challenges while assessing your long-term performance.

But there are ways to do away with the challenges. For example, you can ask a supplier about the method they implement and assure quality, durability, and performance.

Again, you can try to determine the manufacturing and testing processes in developing the breather valves.

Things do not end here, as there are more aspects to explore. So, you can ask the manufacturer if it has any proprietary processes to ensure that design and aesthetic impact can guarantee a high level of functionality.

Usually, trusted and reputed manufacturers have up-to-date manufacturing, testing, and assembly processes.

However, a manufacturer cannot assure a high level of product integrity without such advanced manufacturing facilities.

Therefore, you should not fail to assess the manufacturing process for the breather valves, as that will give you an overall idea about the quality of the breather valves.


If you are looking to invest in breather valves for your business, you should not put money in haste. Instead, you should take into account the relevant factors to assess the proper breather before purchasing. Again, the supplier you choose has an important role to play in determining the quality of the breather valves. You should ensure that you choose a trusted and reliable supplier to make the purchases. Remember, an investment in the wrong device will entail wastage of time and money.

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