introduction

Valves are one of the indispensable fluid control equipment in all sectors of the national economy. They are used in large quantities, involve a wide range, are complex in varieties. The quality of their quality technical level are directly related to the safe production, economic benefits Long-term development.

With the development of the national economy, higher requirements are put forward for the valve structure design, material selection production processing technology. How to improve product performance reduce production use costs has also attracted more more attention in the industry.

This research mainly introduces the current status development trend of valve technology.

1 The status quo of my country's valve industry

Since the reform opening up, with the rapid development of various industries, the valve industry has also undergone rapid development. The number of manufacturers has increased rapidly, the production level has been greatly improved, the valve output has increased substantially, the valve market's complete set rate, complete set level complete set capacity Both have been greatly improved.

Only Zhejiang Province has grown a dozen in the early stage of reform opening up to more than 2,000 valve companies, with sales revenue of more than 30 billion yuan. Especially in Hangzhou, Ningbo, Taizhou, Wenzhou in Zhejiang, Changzhou, Suzhou, Yancheng in Jiangsu, Shanghai, Chengdu in the southwest, Lanzhou in the northwest, Anhui other places, with the help of regional advantages investment large domestic foreign companies, it has gradually formed Complete valve manufacturing production industry chain. The formation of the production industry chain is conducive to the control of production, quality, cost in the valve industry, enables my country's valve industry to develop in a healthy direction of specialization, scale quality.

2 The status quo of valve technology in my country

On the whole, my country's valve technology has made great progress. At present, it has been able to design, produce, test valve products of more than a dozen categories, more than 3000 models, more than 40,000 specifications.

During the "Tenth Five-Year Plan" period, my country's valve industry developed 24-port rotary valves, valves for pneumatic conveying of solid materials (rotary feeders, conveying reversing valves, slide valves), a new generation of high-performance single- two-way sealed three-eccentric composite ring metal Sealed butterfly valves, high temperature butterfly valves, soft hard sealed high vacuum solenoid valves manual pressure-resistant valves, GK-type pipeline ball valves, gate valves with wear-resistant ceramic sealing rings, ball valves, regulating valves. In addition, it has also developed produced high temperature high pressure Y-shaped bellows globe valves, low temperature bellows chlorine valves, subcritical supercritical high temperature high pressure globe valves, biological antibacterial diaphragm valves. The products produced by some enterprises have filled the domestic gap obtained national patents. For example, a new type of high temperature high pressure temperature pressure reducing device (valve) a high-performance full-volume safety valve used in the supercritical unit developed by Hangzhou Huahui Valve Co., Ltd. were respectively awarded national patents in 2008; Zhejiang high medium pressure valve The company successfully developed my country's first large-scale wind tunnel exhaust throttling pressure regulating valve; domestic metallurgical valve leading enterprise Qin Ye Heavy Industry obtained the eighth valve patent for energy-saving, water-saving long-life hot air valve; the development of these products symbolizes my country's valve technology The overall level has been greatly improved.

However, the overall level of domestic valve technology still has a certain gap compared with developed countries in the world. Most domestic enterprises can only produce low-end products with low technology content low added value, the development of new products is only to make some improvements on the original products directly copy foreign similar products. Enterprises lack core technologies with independent intellectual property rights lack high-end products with international competitiveness. Products such as high-temperature high-pressure valves for thermal power units above 600,000 kilowatts, nuclear power valves, special valves for the petrochemical industry, high-parameter high-performance safety valves are mainly imported. The research development power of valve companies is strong, they do pay enough attention to the research development of new products. Valve research development mainly rely on various research institutions.

3 Development trend of valve technology in my country

The rapid development of my country's energy projects urbanization process has brought a golden opportunity to the structural adjustment industrial upgrading of the valve industry. The future market of valves will be mainly concentrated in the power industry, petrochemical, urban construction other industries.

(1) Large-scale construction of power stations. The development of power stations units below 300,000 kilowatts to units above 600,000 kilowatts even up to 1.3 million kilowatts, requiring a large number of large-diameter forged welded structures for subcritical, critical supercritical units, high temperature high pressure relief valves, safety valves other power station valves , The large-scale equipment puts forward stricter requirements on the material, structure reliability of the valve.

(2) The nuclear power industry is gradually increasing. Nuclear power valve is a large-scale wide-ranging hydraulic equipment in nuclear power plants. It connects more than 300 systems of the entire nuclear power plant is a key accessory for the safe operation of nuclear power plants. According to the "Nuclear Power 2005-2020 Mid- Long-term Development Plan" formulated by the state, my country's installed capacity will reach 59.46 million kilowatts by 2020, the total investment in new construction will be 450 billion yuan. A large number of gate valves, globe valves, check valves, butterfly valves, safety Valves, main steam isolation valve, ball valve, diaphragm valve, pressure reducing valve control valve, etc.

(3) Petroleum development is shifting to the inland offshore, the start of the West-East Gas Pipeline, the development of the oil refining industry, the rapid development of oil pipelines. These pipelines have strict requirements on valves require a large number of forged steel flat gate valves double flap butterflies. Type check valve, angle type throttle valve ball valve; offshore oil production platform oil production, blowout prevention, water injection, gas injection, underwater equipment other systems need to develop some special valves resistant to seawater salt spray erosion. These valves require strong corrosion resistance, resistance to storms other abnormal external forces, require reliable sealing, flexible operation convenient maintenance.

(4) The urban construction system has gradually shifted the low-pressure iron gate valve used in the past to the environmentally friendly rubber plate valve, balance valve, metal sealing butterfly valve centerline sealing butterfly valve.

The valve products used in these large-scale projects gradually tend to be large-scale, high-parameterized, high-performance, automated, the ratio of complete sets has been greatly increased. Therefore, higher requirements are placed on the development design of valves, the development of valves has been more focused on product reliability. Performance indicators such as safety security.

New synthetic materials, new alloy steels new processes provide a new direction for the development of valve technology. For example, titanium metal, due to the formation of a strong passivation film on the surface of titanium metal, shows excellent corrosion resistance in many strong corrosive media. Synthetic materials such as polypropylene, polycarbonate, nylon have been widely used in the manufacture of valves used in the chemical industry. The new type of sealing material, flexible graphite, has the characteristics of high temperature resistance, corrosion resistance lubrication, can be widely used in the production of high temperature high pressure valves.

While analyzing drawing on foreign advanced technologies, valve companies should vigorously cultivate their own technical strength, increase research development efforts, transform manufacturing equipment test testing methods that restrict improve quality, take into account the new materials, new technologies, new processes in the valve. Application, develop new products with high technology, high added value independent intellectual property rights.

4 Conclusion

my country's valve manufacturing enterprises should gradually improve the management system, increase investment in scientific research, focus on the training of scientific research personnel, strengthen cooperation with scientific research institutions, colleges universities, participate in international technical exchanges, continue to forge ahead, enhance the company's own scientific research innovation Ability to develop products with independent intellectual property rights comprehensively enhance the competitiveness of enterprises.