All You Wanted To Know About Bag On Valve Technology

Written by Chloe Harwood

Aerosol spraying is a method of formula delivery that all of us are familiar with. However, most of us are not familiar with how aerosols spray systems work. All aerosol spray systems require three components – a container, the product, and pressure. The pressure is created by a propellant gas such as DME and LPG. Once the actuator is pressed, this propellant gas which is in a liquefied state vaporizes and creates the pressure to push the product out through the nozzle. This is how the traditional aerosol system works. 

How does Bag on Valve Differ?

While the basic technology is the same, the bag on valve differs in the formula location and the propellant gas. The main components for the bag on valve system are the container, the bag on valve with the product inside it and the propellant gas which is usually Nitrogen or compressed air.

How Does the System Work?

The bag on valve is placed into the container, and the container is filled with the propellant gas with a pressure of around 0.3~0.4Mpa. The product is then filled into the bag on valve, which increases the pressure of the propellant to around 0.6~0.7Mpa. This pressure squeezes the bag and once the actuator is pressed, it opens the channel and the product comes out. Since the pressure on the bag is from all angles, it allows you to hold the can at any angle and still function. The moment you leave the actuator, the product stops coming out of the nozzle.  

Advantages Over the Traditional Aerosol System

The bag on valve system has far more benefits for consumers and manufacturers alike than the traditional aerosol systems. Given below are some of the important advantages of this system.

100% of the Product can be Emptied

Traditional aerosol packages rarely emptied the container of the entire product as the propellant gas would get used faster than the product. In the case of Bag on Valve technology; since the compressed air or Nitrogen that is used as a propellant gas, remains inside the can and continues exerting pressure on the bag, it allows almost 100% of the product to be dispensed. 


LPG and DME, the gas used as the propellant in the traditional system are extremely flammable. Bag on valve technology uses compressed air or Nitrogen as the propellant making this system much safer.

No Contamination and Environment-Friendly

Like in the traditional system, while everything is inside the container, there is a big difference. In the traditional aerosol system the propellant gas mixed with the product. In the bag on valve system, the propellant gas and the product are isolated from each other. This ensures that there is no contamination of the product by the gas. This system is also environment-friendly as it does not generate VOCs.

Extended Shelf life

The bag on valve technology can help extend the shelf life of oxygen-sensitive products as there is almost no oxygen in the bag containing the product. 

The Bottom Line

Superior technology for dispensing products through the spray dispensing system, the bag on valve technology is perfect for cosmetic, medicine and food industry as it does not allow any contamination of the product.

About the author

Chloe Harwood