Introduction to disc valves

There is a company in the United States that specializes in disc valves, and there is one in Shanghai as well. Disk valves are mainly used in applications where solids with high hardness need to be transported. The sealing surface of a disc valve is disc-shaped; the entire plane serves as the sealing surface, and it has an eccentric structure. When opening and closing, solid particles self-grind the sealing surface, so the sealing surface becomes smoother with use. I’ve seen a sample brought in by that American company that had been in use for 2 years; it was used in coal mines, and its sealing surfaces were almost completely polished to a mirror finish – really impressive. The technology used by this American company involves coating the surface with tungsten carbide, with a thickness of 0.8 millimeters and a hardness of 78 on the Rockwell scale. The one in Shanghai uses fully sintered cobalt-based tungsten carbide, with a hardness of 86 on the Rockwell scale.

As a further note, it’s called Futais in Shanghai, and EVERLASTING in the United States

There are check valves as well as two-way ones. Disk valves are divided into single-seat single-disc type, single-seat double-disc type, and double-seat double-disc type. The first two are one-way valves, while the last one is a two-way valve. As for how to turn it on and off...

Disk valves are primarily used in the pneumatic transportation of solid particulate materials, mainly because such particles can easily cause conventional ball valves to become clogged and suffer severe wear; the valves used in our facility wear out quickly, requiring frequent replacement. There’s no good solution.

Friends upstairs, if you truly want to solve the problem of wear caused by solid materials, you can send us an email at *an101@gmail.com; our disc valves perform quite well when dealing with solid materials.

Can a disc valve be used for the hardness of silicon powder? ! ?

Is the disc valve used at the feed inlet, or to switch between conveying pipelines?

Could you explain what chlorohydration is?

　Trichlorosilane is synthesized by chlorohydridation. The comprehensive utilization of silicon tetrachloride to convert it into trichlorosilane is one of the important indicators of the transition from the traditional Siemens process to the improved Siemens process. There are no established examples of this practice in China yet, and it constitutes a major bottleneck hindering the development of polysilicon manufacturers. The chlorohydridation synthesis of trichlorosilane involves the high-temperature thermal decomposition and hydrogenation of silicon tetrachloride in the presence of a catalyst to produce trichlorosilane. The by-product hydrogen chloride produced then undergoes a chain reaction with silicon powder, thereby causing silicon and hydrogen chloride to react to form trichlorosilane. By utilizing advanced chlorohydration technology, the materials in the production process are subjected to a closed-loop circulation, enabling their most efficient utilization and reducing the energy consumption per unit of polysilicon produced. At the same time, the chlorohydration process utilizes a wet dust removal system, which ensures thorough dust removal and the elimination of metal impurities, thus effectively controlling environmental emissions. The chlorohydration process used by Zhongneng Silicon Industry is among the world’s leading technologies, and relevant patents have been applied for both domestically and internationally.

I’m from Shanghai Futaisi; I’ll answer the questions from the friends above. The hardness range of coal powder is quite wide; depending on its composition, the hardness varies from HRC 55 to 65. In particular, coal powder containing coal gangue has a very high hardness. Silicon powder has a higher hardness, generally ranging from HRC 72 to 75 or even higher. Disk valves indeed perform very well under the operating conditions of these two media, and our practical applications have shown good results. Xuzhou Zhongneng’s chlorohydration process is currently at the highest level in the country; what’s most important is that it solves the problem of utilizing the by-product silicon tetrachloride. If a full closed-loop system can be achieved, this would undoubtedly be the most effective way to reduce costs while also being environmentally friendly.

From a practical perspective, the disc valves produced by Shanghai Futaisi offer excellent cost-performance ratios, along with high-quality service. Moreover, they can have their specifications modified to meet the specific requirements of enterprises.

Imported disc valves leak quickly; even a slight increase in pressure is not sufficient to meet the operational requirements. Moreover, the after-sales support is inadequate, and it’s practically impossible to resolve issues on site. They have now been largely replaced

Why is it said that those in Shanghai are better than those in the United States? What is the reason? Is it due to the special material, or are there improvements in the structure? I am eager to learn from others.