Before the introduction of the slab gate valve, gas valves were typically equipped with single-gate wedge-type water valves and oil-sealed plug valves. However, these solutions did not perform well in gas applications, leading to frequent failures and maintenance issues. As a result, a parallel double-gate valve was designed and successfully implemented, significantly improving performance and reliability in gas systems.
Gas valves play a crucial role in the gas industry, and their proper design and function are essential for safety and efficiency. The Ministry of Construction has placed significant emphasis on standardizing gas valve construction. Several key industry standards have been established, including CJ3005-1992, which outlines general technical requirements for gray cast iron valves used in town gas; CJ3055-1995, which specifies testing and inspection procedures for gas valves; and CJ3056-1995, which sets general technical conditions for valves made from ductile iron and cast steel. In June 2002, the standard for "manual gas valves for household use" was also approved. These standards have played a vital role in regulating the valve industry, promoting technological advancement, and supporting the growth of the gas sector. They provide guidance for manufacturers, users, and developers, enhance understanding of the unique requirements of gas valves compared to general-purpose valves, ensure a higher safety margin, and are widely accepted by professionals in the field.
During the 1980s, China's gas supply mainly relied on artificial coal gas, which contained high levels of impurities and "gas glue." Traditional single-gate wedge-type gate valves struggled to handle these conditions, often resulting in stuck stems and poor sealing. To address this issue, the gas-sealed plug valve was developed, offering better sealing performance and reducing the risk of stem sticking.
As the gas industry expanded and more gas plants were built, there was an increasing demand for large-diameter gas-specific valves. Parallel double-gate valves were introduced to meet these needs, especially for handling artificial gas. These valves can have diameters as large as 1600mm. Key advantages include:
1. The valve can scrape off "gas glue" from the sealing surface during operation, preventing impurities from affecting the seal;
2. A protective cover is installed on the valve stem, protecting it from corrosion caused by "gas glue";
3. A drain hole and side cover are located at the bottom of the valve, allowing debris to be removed from the valve chamber;
4. The full-bore design ensures minimal flow resistance and allows for pigging operations;
5. The valve body features a specially designed "squirrel cage frame rib," reducing weight while enhancing structural strength and rigidity;
6. Made from gray cast iron, the valve is cost-effective and durable;
7. It includes a fully enclosed opening and closing indicator, making it easy for operators to monitor the valve’s status.
SMIRO sliding doors have many advantages:The wall thickness of the door is 3.0, the glass is not paintedand the production is easier;Micro-edge micro-slit design, the visual surface is only 5 mmthere is almost no gap between the door and the track;No grip with damping buffer, no ground rail design,transparent and bright,good health management;Standard 8mm tempered glass, inner rubber process slidingdoor.
The service life of aluminum sliding windows is affected by many factors:
1. Material quality
Aluminum alloy profiles
If high-quality aluminum alloy profiles are used, the wall thickness meets the standard and the alloy composition is excellent, its service life can reach 30-50 years or even longer. For example, some high-quality aluminum alloy profiles such as 6063-T5 have strong corrosion resistance and deformation resistance.
Hardware accessories
Hardware accessories such as pulleys, handles, locks, etc. have a greater impact on the overall life. Good quality stainless steel or copper hardware accessories can be used for 10-20 years under normal use. Cheap and low-quality hardware may be damaged in 5-10 years, such as pulley wear leading to poor sliding and pulling.
2. Use environment
Climatic conditions
In dry and mild climates, aluminum sliding windows have a longer service life. However, if they are located in coastal areas, high humidity and high salt air will accelerate the corrosion of aluminum alloys, which may shorten the service life to about 20-30 years; in areas with more acid rain, it will also cause erosion on its surface.
Daily maintenance
Regular cleaning, maintenance, and timely replacement of aging parts of aluminum sliding windows will greatly extend their service life. On the contrary, if there is a long-term lack of maintenance, the life of the window may be reduced by 5-10 years.
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