The differences in performance between traditional and nitrogen valves derive from their mechanics. Traditional aerosol valves are designed for liquid LPG. This gas evaporates, creating pressure, and propels the product out of the can. Conversely, compressed gas or nitrogen propellant acts as a spring or piston when used with conventional valves, dispensing the inner liquid formulation under controlled pressure.
The properties and behaviour of these elements are vastly different, which has sparked an increasingly prevalent industry-wide discussion. Many brands are asking whether switching from traditional to nitrogen valves is worthwhile and whether doing so will affect product performance and brand perception.
Traditional vs Nitrogen Valve Performance, at a Glance
| Property | Traditional Propellants | Nitrogen Propellants |
| Spray Performance | Consistent until empty. | Will experience a gradual pressure drop unless suitably controlled. *See paragraph below. |
| Solubility | High. | Low. |
| Product Purity | Propellant can influence the product formulation. | Propellant is inert and does not interfere with the product formulation. |
| Safety | Flammable/explosive risk. | Non-flammable. |
| Environmental Impact | High content of VOCs. | Formulation dependant but generally contains low or no VOCs. |
| Cost | LPG or its equivalents (e.g. DME) fluctuate with the oil and gas market rates. | Nitrogen is inexpensive and abundant. |
| Logistical complexity. | Due to flammability regulation, controls are strict on the manufacture, storage and transportation of product. | As a non-flamable, non-toxic substance, nitrogen based aerosols benefit from less regulation and international control. |
| Consumer experience | The current consumer ‘benchmark’ regardless of quality. Can be abused due to high toxicity. | Lower risk of abuse, newer componentry can be used with a 360-degree functionality. |
Is the Spray Pattern of a Nitrogen Valve as Good as an LPG Alternative?
Modern nitrogen valves can now match the spray pattern of traditional LPG aerosol valves for most product types. Historically, nitrogen systems suffered from pressure drop during use, resulting in weaker spray toward the end of the can.
Traditional valves rely on replenishing vapour pressure from liquefied propellant. Nitrogen systems use compressed gas, which naturally reduces in pressure during dispensing. This often caused reduced performance in the final 30% of product.
Recent engineering developments have addressed this issue. New nitrogen valves can maintain pressure and match LPG atomisation performance when paired with technologies such as Salvalco’s Eco-Valve and
purpose-built nitrogen actuators, using precisely calculated expansion and restriction chambers.
How Do Nitrogen and LPG Aerosol Propellants Handle Gas-to-Product Ratio?
LPG is highly soluble and mixes with the active formulation, diluting it during dispensing. Nitrogen is inert with very low solubility, meaning it does not mix with the formulation.
When switching to nitrogen, chemists may reformulate the liquid to replace the removed LPG carrier. This revised formulation is carefully balanced with pressure to ensure full evacuation and consistent performance throughout the can’s lifespan.
Do Nitrogen Valves Influence Product Formulations or Consumables?
Nitrogen is an inert gas and does not interact with product formulations. It displaces oxygen, preventing oxidation that can degrade product quality, freshness and stability. Nitrogen is flavourless, odourless and chemically pure, making it ideal for sensitive goods including food, pharmaceutical and
beauty products.
Nitrogen also remains stable across a wide temperature range. Unlike LPG, it does not cool during use, as it is a dry compressed gas rather than a phase-changing propellant.
Are Nitrogen-Propelled Aerosol Valves Safer Than LPG Alternatives?
Nitrogen-propelled aerosol valves provide a safer consumer experience. Nitrogen is non-toxic, inert and naturally present in the air we breathe. It does not affect indoor air quality and reduces drivers of aerosol abuse associated with LPG systems.
Nitrogen valves are non-flammable. Salvalco’s Eco-Valve technology injects nitrogen into the valve itself, maintaining oxygen levels below 10% and
making ignition physically impossible.
LPG propellants are flammable and emit hydrocarbons and VOCs. In enclosed environments, these vapours can contribute to respiratory irritation, headaches and reduced air quality.
Because nitrogen generates no VOC emissions and is inherently non-flammable, it significantly reduces health and safety risks across the product lifecycle.
Additional safety benefits include:
- Preservation of aluminium can walls: Nitrogen is dry and does not introduce moisture, reducing corrosion risk.
- Minimal VOC venting: Nitrogen valves maintain a tighter pressure seal, reducing atmospheric emissions.
Is the Environmental Impact of Nitrogen Valves Lower Than Traditional Valves?
Yes. Nitrogen-propelled valves have a significantly lower environmental impact. Traditional systems vent vapours over time, whereas nitrogen valves maintain a sealed pressure system that locks hydrocarbons inside the container.
Nitrogen also extends shelf life by preventing oxidation and moisture ingress. Traditional valves may allow oxygen and humidity into the can, degrading the formulation.
Nitrogen is exempt from
VOC regulations, making it future-proof against tightening environmental legislation.
Are Nitrogen Propellants Cheaper Than LPG?
Nitrogen is abundant and inexpensive, with costs primarily linked to compression energy. LPG prices fluctuate with global oil markets and require specialised fire-rated storage and transport.
Because nitrogen is non-flammable, logistics, warehousing and compliance costs are significantly lower.
Interested in Learning More About Nitrogen Valves?
Salvalco is a market-leading manufacturer of
nitrogen-powered aerosol valves, supported by a global turnkey network and nearly 30 years of engineering expertise.
Contact us today to discuss switching from LPG to nitrogen-propelled aerosol valves. We’re happy to arrange a no-obligation consultation.