How does an automatic air vent work?

An introduction to automatic air vents

Automatic air vents are essential components in hydronic systems. Used extensively in both domestic and commercial plumbing and heating systems, automatic air vent valves remove trapped air to ensure efficient performance without manual intervention.

Why are air vents used in systems?

Trapped air can cause a number of problems for plumbing and heating systems. Without effective ventilation components installed, systems may experience issues, such as:

• Reduced system/energy efficiency
• Fluctuating water flow
• Uneven heating/cooling distribution
• Increased noise
• Corrosion 
• Accelerated component damage

As specialists in hydronic system components, we offer a range of automatic air vents for plumbing and heating systems, including our Minical Automatic Air Vent. For more information and enquiries regarding our air ventilation components, contact our specialist team today.

How do automatic air vent valves work?

As air enters into a heating or plumbing system, it rises to the highest points. As a result, automatic air vents are typically installed in the highest points in systems for the effective removal of trapped air.

Automatic air vents are composed of a number of key components including a float and spring mechanism, air and water chambers, and a needle valve, that are responsible for the extraction of air from closed water loops.

Air Ventilation Process

For the removal process, air first enters into the air chamber of the vent valve. As the air accumulates, it begins to displace the water in the water chamber, reducing the upward buoyant force on the float mechanism. As a result, the float begins to fall, compressing the spring activated needle valve which allows for trapped air to escape from the system.

To discover more about the functionality and purpose of automatic air vents, watch our dedicated guide to how our air vent valves work.

How is water not extracted from automatic air vent valves?

As trapped air is released from air vents, air pressure begins to decrease in the system to levels consistent with ambient air pressure. The pressure exerted on the spring, responsible for opening the needle valve, will then be reduced, leading to spring decompression and the closing of the valve.

This action ensures system water is prevented from escaping, whilst reducing the possibility for air ingress.

Our automatic air vents

At Altecnic, we offer a comprehensive range of automatic air vent valves designed to protect your plumbing and heating system components, whilst maximising performance and operation.

Our Minical Automatic Air Vents ensure consistent ventilation performance of trapped air, trusted by homeowners, plumbers and contractors for use in domestic and commercial hydronic systems.

Further advice and enquiries

For further advice and guidance, our specialist team are available to support with your requirements and order enquiries. Contact us today.