Recently, Zhejiang Inspection and Quarantine Bureau found that a batch of 770 boxes, 71,020 valves with a value of 58,000 U.S. dollars were exported from a valve company in the province. They found that a large number of "1/2" ball valves caused cracks in the shell. The shell test failed, far exceeding the upper limit of the defective rate of the inspection procedure. A non-conformity notice was issued for the Bureau and the company was asked to re-check the valves for rework. However, after the valve company said that all the pressure tests had been carried out and the non-conforming products had been removed, the Zhejiang Inspection and Quarantine Bureau sent personnel to conduct re-inspection. As a result, it was found that the defective products that failed the shell pressure test were still high. As determined by anatomy, the shells of these valves are very thin, apparently due to cutting corners. In this regard, the Inspection and Quarantine Bureau issued unqualified notices, prohibiting its export, and will further strengthen the inspection and supervision of this company.
Copper is an important raw material for valve products. Since 2006, due to soaring prices of raw materials such as copper and zinc, and export prices of valve products have been difficult to raise prices accordingly, many manufacturing companies have tried every means to reduce costs by making profits, so they have taken this method of cutting corners. In order to attract customers, some manufacturers also promised customers what valve they need, and they all provide it. The level of product quality can be imagined. Zhang Bo, a chemical plant in Zhangzhou, Zhejiang Province, complained that the stainless steel gate valves, globe valves, and check valves used by them were mixed, and some of the valves were running, running, dripping and leaking. This caused a lot of safety hazards for production. This situation is really worrying.
Relevant experts believe that the current domestic key valve production enterprises have been able to design and manufacture various valves in accordance with international standards such as ISO International Standard, DIN German Standard, and AWWA American Standard. The overall level of the industry has been greatly improved, but the quality is not yet stable enough. , Such as running, running, drip, leakage phenomenon often occurs in domestic valves. Especially in the case of rising prices of valve raw materials, the use of alternative materials to process valves is more common. Such as using iron balls instead of copper balls, using iron-plated stems, bonnets instead of copper stems, bonnets, and plastic sealing rings instead of plastic king (polytetrafluoroethylene) sealing rings, due to the unstable performance of alternative materials, Inevitably lead to a decline in valve quality. In the first three quarters of 2006, Zhejiang Inspection and Quarantine Bureau found that 26 batches of export valves were unqualified and the number exceeded 770,000 and the value of goods was over 840,000 US dollars.
It is predicted that the largest users of future market valves will be petrochemical, power, metallurgy, chemical, and urban construction. The most demanding valve products in these industries are mainly high-temperature, high-pressure, forged pilot-operated gate valves, metal-sealed, oil-sealed AVDCO valves, soft-sealable plug valves for finished oils, large-diameter emergency-cut butterfly valves, and high-pressure large-diameter top-loading valves. Ball valve, forged steel high pressure large diameter globe valve and so on. Although the market is an attractive big cake, but the technical content and quality requirements are high, although the domestic valve industry manufacturers are gradually increasing research and development efforts, and actively develop these new products, but the current product quality is still a bottleneck.
According to the data from the valve branch of China General Machinery Industry Association, there are more than 2,000 valve manufacturing enterprises in China, most of which are located in Jiangsu, Zhejiang, and Central China. According to the Wenzhou valve industry, annual sales amounted to 20 billion yuan, accounting for 40% of the domestic market. In order to break through the bottleneck of product quality, the Yongjia County government of Wenzhou, known as the "hometown of China's pump and valve," has taken the lead in the valve industry to implement brand-name quality improvement projects since August 2006. It plans to use two years of hard work to make the valve industry The foundation of enterprise quality management has been further consolidated, and the proportion of enterprises and product quality adopting international standards has been significantly improved. The obvious regional advantages of the valve industry in terms of scale, technology, talents, and brands have been initially formed, eventually making Yongjia a national high quality valve and valve industry base. .
To this end, people in the industry pointed out that on the one hand, the valve industry should vigorously adopt international standards and advanced foreign standards, strictly implement existing national standards, and pay close attention to its own quality management; on the other hand, it should continue to carry out internal and external leakage research and strict Mechanical processing technology, vigorously promote new types of sealing materials, as soon as possible to solve running, running, drip, leakage and other quality problems.
Copper is an important raw material for valve products. Since 2006, due to soaring prices of raw materials such as copper and zinc, and export prices of valve products have been difficult to raise prices accordingly, many manufacturing companies have tried every means to reduce costs by making profits, so they have taken this method of cutting corners. In order to attract customers, some manufacturers also promised customers what valve they need, and they all provide it. The level of product quality can be imagined. Zhang Bo, a chemical plant in Zhangzhou, Zhejiang Province, complained that the stainless steel gate valves, globe valves, and check valves used by them were mixed, and some of the valves were running, running, dripping and leaking. This caused a lot of safety hazards for production. This situation is really worrying.
Relevant experts believe that the current domestic key valve production enterprises have been able to design and manufacture various valves in accordance with international standards such as ISO International Standard, DIN German Standard, and AWWA American Standard. The overall level of the industry has been greatly improved, but the quality is not yet stable enough. , Such as running, running, drip, leakage phenomenon often occurs in domestic valves. Especially in the case of rising prices of valve raw materials, the use of alternative materials to process valves is more common. Such as using iron balls instead of copper balls, using iron-plated stems, bonnets instead of copper stems, bonnets, and plastic sealing rings instead of plastic king (polytetrafluoroethylene) sealing rings, due to the unstable performance of alternative materials, Inevitably lead to a decline in valve quality. In the first three quarters of 2006, Zhejiang Inspection and Quarantine Bureau found that 26 batches of export valves were unqualified and the number exceeded 770,000 and the value of goods was over 840,000 US dollars.
It is predicted that the largest users of future market valves will be petrochemical, power, metallurgy, chemical, and urban construction. The most demanding valve products in these industries are mainly high-temperature, high-pressure, forged pilot-operated gate valves, metal-sealed, oil-sealed AVDCO valves, soft-sealable plug valves for finished oils, large-diameter emergency-cut butterfly valves, and high-pressure large-diameter top-loading valves. Ball valve, forged steel high pressure large diameter globe valve and so on. Although the market is an attractive big cake, but the technical content and quality requirements are high, although the domestic valve industry manufacturers are gradually increasing research and development efforts, and actively develop these new products, but the current product quality is still a bottleneck.
According to the data from the valve branch of China General Machinery Industry Association, there are more than 2,000 valve manufacturing enterprises in China, most of which are located in Jiangsu, Zhejiang, and Central China. According to the Wenzhou valve industry, annual sales amounted to 20 billion yuan, accounting for 40% of the domestic market. In order to break through the bottleneck of product quality, the Yongjia County government of Wenzhou, known as the "hometown of China's pump and valve," has taken the lead in the valve industry to implement brand-name quality improvement projects since August 2006. It plans to use two years of hard work to make the valve industry The foundation of enterprise quality management has been further consolidated, and the proportion of enterprises and product quality adopting international standards has been significantly improved. The obvious regional advantages of the valve industry in terms of scale, technology, talents, and brands have been initially formed, eventually making Yongjia a national high quality valve and valve industry base. .
To this end, people in the industry pointed out that on the one hand, the valve industry should vigorously adopt international standards and advanced foreign standards, strictly implement existing national standards, and pay close attention to its own quality management; on the other hand, it should continue to carry out internal and external leakage research and strict Mechanical processing technology, vigorously promote new types of sealing materials, as soon as possible to solve running, running, drip, leakage and other quality problems.
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