Wear-resistant ball valve we say here is evolved from the function of the plug valve, its opening and closing parts for the ball core, through its stem rotation 90 degrees to achieve valve switch, wear-resistant ball valve in the pipeline is mainly used to cut off, distribution and change the flow of the medium, designed into the V-shaped opening of the V-shaped ball valve also has good flow regulation performance.
The reason why it is widely used in modern industrial occasions is that the ball valve is quickly opened and closed, has good sealing, simple structure and low flow resistance.
Ball valve structure classification basis:
Ball valve according to the structure can be divided into fixed ball valve, floating ball valve, track ball valve, V ball valve, eccentric half ball valve, three-way ball valve, four-way ball valve, etc.
According to the connection method, it can be divided into flange ball valve, clamp ball valve, internal thread ball valve, external thread ball valve, welded ball valve, clamp ball valve (generally sanitary ball valve), sleeve ball valve, etc.;
According to the sealing material, it can be divided into soft sealing ball valves and metal hard sealing ball valves.
Soft seal ball valve is generally suitable for the temperature is less than 150 degrees of the medium, 150 degrees above the medium, the use of PPL seal or carbide metal seal.
Small diameter ball valve, generally use floating ball valve, large diameter ball valve, because the required opening and closing torque is relatively large, often choose fixed ball valve, can reduce the torque required when opening and closing, improve the reliability of the work. V-type ball valves and eccentric half ball valves can be used to regulate the flow, and three-way ball valves and four-way ball valves are used to reverse the fluid.
Ball valve commonly used materials are carbon steel, 304 stainless steel, 316 stainless steel, for highly corrosive media, the selection of valve body and ball fully lined with PTFE.
Ball valve drive mode mainly electric, pneumatic, worm gear transmission, relative to small diameter ball valve, generally use the handle to open and close.
4, fire valve in the future three industries widely used
It is understood that the market size of the fire valve industry in 2013 has expanded a lot compared with last year, which is an obvious fact. Until 2013, various fire valve manufacturers and traders have been more than 700, and even daily trading enquiries are more than 200, it is obvious that the supply and demand market of fire valves is heating up. From the preliminary analysis of the first quarter data, it can be concluded that the fire valve demand market is 20 percentage points higher than last year.
In the past ten years, with the development of China's fire valve (valve industry dynamics) industry, the varieties and specifications of fire valves are also increasing, and more and more industries are applied to fire valves, such as the petrochemical industry, oil refining industry, nuclear power industry, thermal power industry, etc., are widely used. Here, take you to understand the development prospects of the fire valve in the following three industries.
Petrochemical industry: petrochemical industry competition has always been very fierce, the requirements for fire valve equipment is also the most stringent, the future of the fire valve will cooperate with industrial automation, promote the overall level of fire valve equipment, the development of multi-functional, high efficiency, low consumption of petrochemical fire valve equipment. The annual output value of China's petrochemical enterprises is in the hundreds of billions, which shows that China has a large fire valve market (valves, pumps), we should consider from the perspective of market changes, to ensure stability and development.
Oil refining industry: After 60 years of development, China's oil refining industry has rapidly expanded its production scale. Under the promotion of a series of policy measures, the output value and output of China's refining industry continued to grow in 2010, and the structural adjustment gradually advanced, and continued to maintain a good momentum of development. In 2010, the oil refining industry achieved an output value of 2,425.2 billion yuan, an increase of 38%. Therefore, it can also be seen that China's oil refining industry fire valve application market space is huge.
Nuclear power industry: Fire valves in this industry as the basic equipment of nuclear power equipment, roughly accounting for 5-10% of the capacity. China will continue its nuclear power development plan to reach 40GW in 2015 and 75GW in 2020, and China will restart the approval of new nuclear projects around mid-2012. Therefore, in this field, we must constantly introduce new products and new equipment to meet market demand.
In addition, the construction and boiler industry as well as special industries need to apply fire valves. In particular, the use of spring type fire valve is very extensive, and it is used in many enterprises, which fully shows that the development of fire valve is very rapid and the prospect is good. At the same time, more and more industry applications also have more new requirements for fire valve products, and the quality and technical requirements for fire valves are becoming higher and higher.