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 structure classification basis of ball valve:

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 structure;

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 valve is generally suitable for the medium whose temperature is less than about 150 degrees. For the medium above 150 degrees, PPL seal or cemented carbide metal seal is used.

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 half-ball valves can be used to adjust the flow, while three-way ball valves and four-way ball valves are used to reverse the flow of fluid.

The commonly used materials for ball valves are carbon steel, 304 stainless steel, and 316 stainless steel. For particularly corrosive media, the valve body and the 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 diameter ball valve, the handle is generally used to open and close.

4, the fire valve will be widely used in the next three industries

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 *** quarterly 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 decade, the types and specifications of fire valves are also increasing, and more and more industries are applying 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 extremely strict. The future fire valve will cooperate with industrial automation to promote the improvement of the overall level of fire valve equipment and develop multi-function, high efficiency and low Consumed petrochemical fire valve equipment. The annual output value of my country's petrochemical enterprises is in the hundreds of billions, which shows that my country 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, my country’s oil refining industry has rapidly expanded its production scale. Driven by a series of policies and measures, the output value and output of my country'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 be seen that there is a huge market for fire valve applications in my country's oil refining industry.

Nuclear power industry: As the basic equipment of nuclear power equipment in this industry, fire valves roughly occupy 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, the 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. This 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 for fire valves are getting higher and higher.