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The first domestic float automatic exhaust valve has been the national patent
Over the years, water loss in the heating systems of northern cities has been a major challenge for urban heating authorities. According to field investigations, a thermal power plant can supply 8,000 tons of hot water per hour, but it loses 500 tons hourly, which adds up to 12,000 tons daily. This loss accounts for 6% of the total water supply, far exceeding the national standard of no more than 1%. As a result, addressing this issue has become a top priority.
The main cause of water loss in China’s heating systems is outdated infrastructure, including old gas collection tanks and manual exhaust valves. These systems are not only inefficient but also contribute significantly to unnecessary water wastage.
In a hot water heating system, air can enter the pipeline in three main ways: first, during the operation of the circulation pump; second, when negative pressure is created during boiler or pump shutdowns; and third, as cold water is continuously added to the boiler, causing air to separate during the heating process.
Exhaust valves are essential to prevent "air resistance" and ensure smooth water circulation. However, traditional manual exhaust valves are problematic because they allow both air and hot water to escape. To make it easier for users, these valves are often installed at the bottom of the pipeline, leading to bathrooms or kitchens, with gate valves placed near sinks or drains. As a result, manual exhaust relies on pressure to push out air until hot water flows, which is inefficient and leads to significant water loss.
Normally, the valve should be closed immediately after hot water starts flowing, but in reality, the duration of the release is uncontrolled. It depends entirely on individual households, and without proper supervision, many people leave the valve open for extended periods. In some cases, the valve is left open all day to avoid conflicts between neighbors, leading to continuous water loss.
Each residential building typically has one or two exhaust valves per loop, and with multiple units, the total number is considerable. Even with regular manual venting, a lot of water is wasted. When the valve is left open without control, the problem becomes even worse. Manual exhaust valves are the only ones that allow water to be released, and other parts of the system are strictly regulated. Therefore, it's nearly impossible to monitor or control how long the valve remains open.
The most effective solution to prevent large-scale water loss is to replace manual exhaust valves with high-quality automatic ones. These valves are widely used in developed countries and eliminate the need for manual intervention. Installed at designated points in the pipeline—typically at the highest point of horizontal pipes—they automatically open when air enters and close once the air is fully expelled. This ensures no water is lost during the process, solving issues like "air resistance" and excessive water waste.
Automatic exhaust valves reduce labor costs, eliminate the only outlet for water loss, and maintain steady flow. They improve heating efficiency and save energy and water resources effectively. The cost of implementing this technology is low compared to the value of the water saved. With a heating season lasting 40 to 50 days, the investment can be quickly recovered, providing significant economic and social benefits.
A company has integrated advanced global technology with local conditions to develop the CP1X-0.5 float-type automatic exhaust valve. After seven years of development, the fourth-generation product (Patent No.: XXX) is now in mass production. The valve is easy to install, requires no removal, and features self-cleaning capabilities. It aligns with national initiatives and will provide a solid material foundation for heating system upgrades and technical improvements, helping to prevent water loss in heating systems.