Galvanized steel pipe is a kind of Carbon Steel Pipe, mostly welded pipe, Galvanized steel pipes are divided into cold galvanized steel pipes (electro galvanized steel pipes) and hot-dip galvanized steel pipes. At present, hot-dip galvanized steel pipes are mainly used in fire protection, electric power and highways.
Galvanizing can increase the corrosion resistance of steel pipes and prolong their service life. Galvanized pipes are widely used. In addition to being used as pipeline pipes for water transmission, gas, oil and other general low-pressure fluids, they are also used as oil well pipes and oil transmission pipes in the petroleum industry, especially in offshore oil fields, as well as pipes for oil heaters, condensing coolers, coal distillation oil washing exchanges of chemical coking equipment, as well as trestle pipe piles, support frames of mine tunnels, etc.
Hot-dip galvanizing (HDG), as referenced is the process of dipping fabricated steel into a kettle or vat of molten zinc.
Hot-dip galvanizing (HDG) is the process of coating iron, steel or ferrous materials with a layer of zinc. This done by passing the metal through molten zinc at a temperature of 860°F (460°C) to form zinc carbonate (ZNC03). Zinc carbonate is a strong material that protects steel and can prevent corrosion in many circumstances. Hot-dip galvanizing can be carried out cheaply and in large batches.
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Float automatic exhaust valve research and development
Over the years, the significant loss of hot water during the heating season has been a major challenge for the northern urban heating industry. According to field investigations, a typical thermal power plant heat company supplies 8,000 tons of water per hour, but loses 500 tons hourly, resulting in a daily loss of up to 12,000 tons. This represents 6% of the total water supply, far exceeding the national standard of 1%. As a result, addressing this issue has become a top priority.
The main causes of water loss in China’s heating systems are outdated infrastructure and inefficient practices. Many heating and hot water pipelines still use old gas collection systems and manual exhaust valves. Air can enter the system through three primary ways: first, when the circulation pump operates, it may draw in air; second, when the boiler or pump is turned off, negative pressure can pull air into the system; third, cold water replenished into the boiler separates air during heating.
Exhaust valves are essential to prevent "air resistance" and ensure proper hot water circulation. However, manual exhaust valves are problematic because they allow both air and hot water to escape. To make operation easier, these valves are often installed not at the top of the system but instead connected to bathrooms or kitchens, with gate valves placed near sinks or drains. As a result, manual exhaust involves releasing pressure until hot water comes out, which is time-consuming and leads to unnecessary water loss.
In reality, the duration of water release is hard to control, and only residents can manage it. In residential buildings, each loop typically requires 1–2 exhaust valves, and with multiple units, the number becomes substantial. Even regular manual venting results in significant water loss, let alone cases where valves are left open for long periods or even kept running 24/7 to avoid disputes between neighbors. Manual exhaust valves are the only ones that allow water to be released, and their operation is not regulated by heating standards, making them a major source of water leakage.
The most effective solution to reduce hot water loss is to replace manual exhaust valves with high-quality automatic ones. These valves are widely used in many developed countries. Unlike manual valves, automatic ones don’t require human intervention. They are installed at designated points—usually at the highest point of horizontal pipes, which must be tilted at 3‰ and cannot have bends or dips. When air enters the valve, it automatically opens to release it and then closes once the air is gone, preventing any hot water from escaping. This eliminates the risks of improper timing, “air resistance,†and excessive water loss.
Using automatic exhaust valves reduces labor, eliminates the only outlet for water loss, ensures consistent flow, and saves energy and water resources. The cost of replacing manual valves with automatic ones is relatively low compared to the value of the water lost. With an estimated recovery period of just 40–50 days during the heating season, the return on investment is quick and highly beneficial. This technology brings both economic and social advantages.
A Chinese company has integrated global advanced 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 application No. XXX) has now entered mass production. It is designed to be installed without removal and features easy cleaning, aligning with national initiatives. This innovation is set to provide a solid material foundation for future heating system upgrades and technical improvements aimed at reducing water and heat loss.