The wear-resistant ball valve we are talking about here evolved from the function of the plug valve. Its opening and closing part is a ball core. The valve stem is turned 90 degrees to achieve valve switching. The wear-resistant ball valve is mainly used to cut off the pipeline. , Distribute and change the flow direction of the medium. The V-shaped ball valve designed as a V-shaped opening also has good flow regulation performance.

The reason why it is widely used in modern industrial occasions is that the ball valve opens and closes quickly, has good sealing performance, simple structure and low flow resistance.

The structural classification of ball valves is based on:

Ball valves can be divided into fixed ball valves, floating ball valves, orbital ball valves, V-shaped ball valves, eccentric half ball valves, three-way ball valves, four-way ball valves, etc. according to their structural form;

According to the connection mode, it can be divided into flange ball valve, wafer ball valve, internal thread ball valve, external thread ball valve, welded ball valve, clamp ball valve (generally sanitary ball valve), card sleeve ball valve, etc.;

According to the sealing material, it can be divided into soft sealing ball valve and metal hard sealing ball valve.

Soft-seal ball valves are generally suitable for media with a temperature less than about 150 degrees, and for media above 150 degrees, use PPL seals or hard alloy metal seals.

Small-caliber ball valves generally use floating ball valves and large-caliber ball valves. Because the opening and closing torque required is relatively large, fixed ball valves are often selected, which can reduce the torque required for opening and closing and improve the reliability of work. V-shaped ball valves and eccentric semi-ball valves can be used to adjust the flow, while three-way ball valves and four-way ball valves are used to reverse the direction of the fluid.

Commonly used materials for ball valves are carbon steel, 304 stainless steel, and 316 stainless steel. For particularly corrosive media, the valve body and ball are fully lined with PTFE.

The main driving methods of the ball valve are electric, pneumatic, and worm gear transmission. Compared with the small-caliber ball valve, the handle is generally used to open and close.

4. The fire valve will be widely used in the three major industries in the future

It is understood that the market size of the fire valve industry in 2013 has expanded a lot compared with last year. This is an obvious fact. Until 2013, there were more than 700 fire valve manufacturers and traders, and there were even more than 200 trading inquiries every day. It is obvious that the fire valve supply and demand market is heating up. From the preliminary analysis of the first quarter data, it can be concluded that the fire valve demand market is 20% higher than last year.

With the development of China's fire valve (valve industry dynamics) industry in the past ten years, the types and specifications of fire valves are also increasing, and more and more industries apply fire valves, such as petrochemical industry, oil refining industry, nuclear power industry, and thermal power industry. And so on are widely used. The following will take you to understand the development prospects of fire valves in the following three industries.

Petrochemical industry: The competition in the petrochemical industry has always been fierce, and the requirements for fire valve equipment are also the most stringent. In the future, fire valves will cooperate with industrial automation to promote the improvement of the overall level of fire valve equipment and develop multi-functional, high-efficiency, low-consumption petrochemicals. Fire valve equipment. The annual output value of China's petrochemical companies is in the hundreds of billions, which shows that China has a large fire valve market (valves, water pumps). We should consider from the perspective of market changes and ensure stable development.

Oil refining industry: After 60 years of development, China's oil refining industry has rapidly expanded its production scale. Driven by a series of policies and measures, the output value and output of China's oil refining industry continued to grow in 2010, and structural adjustments were gradually advanced, continuing to maintain a good momentum of development. In 2010, the oil refining industry achieved an output value of 2,425.2 billion yuan, a year-on-year increase of 38%. Therefore, it can also be seen that there is a huge market for fire valve applications in China's oil refining industry.

Nuclear power industry: As the basic equipment of nuclear power equipment in this industry, fire valves roughly account for 5-10% of the capacity. China will continue its nuclear power development plan. The installed nuclear power capacity will reach 40GW and 75GW in 2015 and 2020, respectively. China will restart the approval of new nuclear power projects around mid-2012. Therefore, new products and new equipment must be continuously introduced in this field to meet market demand.

In addition, construction and boiler industries, as well as special industries, require the application of fire valves. In particular, the use of spring-type fire valves is very wide, and they are used in many companies, which fully shows that the development of fire valves is very rapid and the prospects are good. At the same time, more and more industrial applications have more new requirements for fire valve products, and the quality and technical requirements of fire valves are getting higher and higher.