Air valves are essential components in fluid systems that are designed to release air or gases from pipelines while maintaining the integrity of the system. There are two main types of air valves: single-orifice and double-orifice air valves. In this article, we will explore the differences between these two types of air valves, their working principles, and their applications in fluid systems.
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A single orifice air valve, as the name suggests, has a single orifice or opening through which air or gases can be released from the pipeline. These valves are commonly used in pipelines that carry liquids and are designed to release air or gas pockets that accumulate at high points in the system.
Working Principle:
When the pipeline is in operation, air or gas pockets tend to accumulate at high points due to their lower density compared to the liquid. As the liquid flows through the pipeline, it pushes these air or gas pockets upward, causing them to reach the single orifice air valve. The air valve then opens, allowing the air or gas to be released from the system, preventing the formation of airlocks or blockages.
Applications:
Single-orifice air valves are commonly used in water distribution systems, wastewater pipelines, and irrigation systems. They are particularly effective in preventing air pockets from causing disruptions in the flow of liquids.
Double Orifice Air Valve
A double orifice air valve, on the other hand, has two orifices or openings for air release. One orifice is located at the top, while the other is located at the bottom of the valve. The design of double orifice air valves allows them to perform additional functions beyond air release.
Working Principle:
The top orifice of the double orifice air valve operates similarly to the single orifice air valve, releasing air or gas pockets that accumulate at high points in the pipeline. The bottom orifice serves a different purpose: it allows for the release of larger volumes of air or gases that may accumulate at low points in the pipeline.
Applications:
Double orifice air valves are commonly used in larger fluid systems, where the accumulation of air or gas pockets can occur at both high and low points. Their ability to release air from multiple locations makes them suitable for a broader range of fluid systems, including larger water distribution networks, industrial pipelines, and sewage systems.
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In summary, the main difference between single-orifice and double-orifice air valves lies in their design and functionality. Single-orifice air valves have a single opening for air release and are commonly used to release air or gas pockets at high points in fluid systems. On the other hand, double-orifice air valves have two openings, allowing for the release of air or gas at both high and low points in larger fluid systems. The choice between these two types of air valves depends on the specific requirements and characteristics of the fluid system they will be used in.
We can also classify air valves using their body construction or the number of orifices (opening). Based on this classification, there are two types:
Single Orifice Valves:
Single orifice valves have one air inlet and outlet. They find applications in venting small quantities of accumulated air out of the pipe during operation. Hawle single orifice air valves are available in models and models .
Double Orifice Valves:
Double orifice valves have one large outlet and one small outlet. The large outlet admits air in large quantities while a pipe section is being drained. It's also responsible for venting out the air during the pipe filling operation. The small outlet is responsible for venting out small amounts of accumulated air during the pipeline’s operation.
When selecting air valves for water distribution or sewage systems, there are several factors to consider. Before you even look into the manufacturer's catalog, you have to decide your system's requirements and plan. Hawle offers air valves for a wide variety of water distribution and sewage systems. To properly select one from the catalog, you have to determine the following characteristics:
Size
The opening size refers to the nominal diameter of the air valve. It affects how much air the valve is going to be able to admit or vent out. Hawle recommends following the guidelines from DVGW “Arbeitsblatt W 334” for sizing air valves. (This page is only available in German.)
Fluid medium
The fluid medium in the pipe is the first thing to consider when selecting an air valve. Hawle makes valves for two main types of liquids- Potable water and wastewater. It's essential to get the proper valve for each.
Air valves play vital roles in sewage networks. The amount of air entrained in wastewater systems is far greater than that in water transmission networks. If air valves are not present on the pipes, the trapped air can significantly increase the energy needed to run the sewage network. In addition, one of the major gases evolved in wastewater systems, Hydrogen Sulphide, is highly corrosive. It can attack and weaken pipes if it's not properly vented out to the atmosphere.
Hawle has an extensive selection of Air Release valves well suited for Sewage networks. These high-performance valves are made out of high-quality, corrosion-resistant materials. So, you can be sure your wastewater system is getting the best protection possible.
Operating pressure
The operating pressure (Nominal pressure) refers to the range of working pressures the valve can withstand. Although Hawle's valves have a reasonable safety factor, the valve must still match the operating conditions in the pipe. Hawle manufactures air valves in various diameters and in a wide pressure range. For example, a Hawle automatic combination air valve with triple function is available in DN 50 - DN 300 and up to PN 40 on request.
Connection method
When choosing a valve, you have to consider how it will interface with the pipeline infrastructure. Hawle air valves come with threaded, flanged, and BAIO connections.
Installation location
An air valve can be placed underground, above ground, or in a chamber. If the pipeline is underground, you will need to pair the air valve with an air release set for proper venting.