Who knows the brand rankings for compressors in various forms?
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Who knows the brand rankings for compressors in various forms? Including centrifugal, piston, screw, and so on! Experts are welcome to discuss!
OP, your question is a bit too broad; it’s really difficult to determine a specific order, as different factors often lead to varying ranking results. Currently, for centrifugal compressors, the company with the widest range of products is probably Atlas ； However, Siemens, GE, Mitsubishi, Elliott, Cameron, DRESSER RAND, and others are all top international manufacturers of centrifugal compressors. Reciprocating compressors are divided into horizontal and vertical types, with the main manufacturers including NEUMAN & ESSER, DRESSER-RAND, BURCKHARDT, SIAD, KOBE STEEL, MITSUI, etc. Screw compressors from Atlas, Ingersoll Rand, Berg, KOBE STEEL, etc. I hope the above information is helpful to you
Gas compressors: In 1998, the gas compressor industry comprised 77 manufacturing enterprises (aggregated units), which employed a total of 61,178 workers. Of these, 35,780 were workers and apprentices, and 4,793 were engineering and technical personnel ； The original value of fixed assets is 3,394.72 million yuan, and that of current assets is 4,487.16 million yuan. The total industrial output value, industrial sales value, and sales revenue in the compressor industry all declined compared to the same period last year. A considerable number of enterprises in the industry are operating below capacity, with idle production capabilities. Coupled with disorderly price competition within the industry, the overall quality of economic operations has deteriorated, resulting in poor overall economic efficiency and adversely affecting the development of the industry. In 1998, the entire industry achieved an aggregate industrial output value (at constant prices) of 3.09 billion yuan, a 5.1% decrease compared to 3.26 billion yuan in the same period of the previous year; sales revenue amounted to 2.94 billion yuan. A decrease of 10.9 compared to the same period last year ； Achieved profits and taxes of 195.91 million yuan ； A profit of 19.16 million yuan was achieved; the total amount of profits and taxes decreased by 92.67 million yuan compared to the same period last year, representing a decline of 32.1% ； Total profits dropped by 81.87 million yuan, a decrease of 81%. The 14 key enterprises (including Tingtan Compressor Co., Ltd. after its restructuring) achieved an industrial output value (at constant prices) of 1.55 billion yuan, accounting for 50.1% of the total output value of the entire industry, a decrease of 3.9% compared with the same period last year. Industrial sales revenue amounted to 1.54 billion yuan, a 6.7% decrease compared to the same period last year. The total amount of taxes and profits generated was 96.06 million yuan, with a profit of 110,000 yuan; both taxes and profits declined by 39.8% compared to the previous year, and the profit represented only 0.2% of that in the previous year. In 1998, the top three enterprises in terms of total output value were: Shanghai Dalong Machinery Factory with 400.05 million yuan, Shanghai Compressor Co., Ltd. with 361.5 million yuan, and Shenyang Gas Compressor Co., Ltd. with 288.18 million yuan. There are 9 enterprises with output values exceeding 100 million yuan; together, these 9 enterprises account for 50% of the total output value of the entire industry. Their production levels remain at the forefront of the industry, showing relative stability and growth. Out of the 77 enterprises in the entire industry, only 21 reported a slight increase in their total output value. For the remaining 56 enterprises, production levels fell short of those in the same period last year, thereby directly affecting the overall pace of industrial development (the performance of key enterprises in terms of various economic indicators is shown in Table 1). In 1998, the entire industry produced a total of 42,014 compressors of various sizes, including 16 nitrogen-hydrogen compressors, 44 hydrogen compressors, 31 liquefied petroleum gas compressors, 115 carbon dioxide compressors, 37 gas compressors, and 68 compressors for other gases. The entire industry produced 119,698 micro-compressors in total, 71,220 fewer than in the previous year. Fourteen key enterprises produced 7,787 compressors of various sizes, as well as 11,909 miniature compressors; the output remained roughly the same as the previous year. Table 1: Economic and technical indicators of key enterprises in the gas compressor industry in 1998
Enterprise Name | Total Industrial Output Value (10,000 yuan) | Industrial Sales Value (10,000 yuan) | Product Sales Revenue (10,000 yuan) | Total Profit (10,000 yuan) | Total Profits and Taxes (10,000 yuan) | Industrial Added Value (10,000 yuan) | Average Balance of Net Fixed Assets (10,000 yuan) | Total | Of which: Export value
Total | 154,981 | 144,274 | 3,500 | 154,393 | 11 | 9,606 | 42,483 | 133,704
Shenyang Gas Compressor Co., Ltd. | 23,818 | 20,481 | 1,313 | 20,020 | 150 | 1,923 | 5,006 | 35,316
Beijing No.1 General Machinery Factory | 5,712 | 6,105 | 0 | 8,065 | -648 | -170 | 1,077 | 7,598
Shanghai Compressor Co., Ltd. | 35,150 | 31,308 | 0 | 38,889 | 1,001 | 3,241 | 8,768 | 11,397
Shanghai Dongfang Compressor Factory | 5,725 | 4,649 | 1,510 | 4,662 | 0 | 240 | 1,234 | 1,075
Jiangxi Gas Compressor Factory | 4,822 | 5,712 | 696 | 5,832 | 55 | 604 | 1,826 | 4,819
Wuxi Compressor Co., Ltd. | 14,370 | 15,952 | 388 | 15,952 | 503 | 1,646 | 5,536 | 9,890
Nanjing Compressor Co., Ltd. | 12,165 | 12,200 | 662 | 12,215 | 258 | 953 | 4,655 | 6,461
Bengbu Compressor General Factory | 7,253 | 5,954 | 0 | 5,144 | -488 | -111 | 2,654 | 2,939
Liuzhou Compressor General Factory | 13,290 | 12,404 | 135 | 12,440 | 92 | 741 | 3,951 | 19,371
Liuzhou No.2 Air Compressor General Factory | 13,883 | 12,532 | 0 | 14,237 | 314 | 1,253 | 4,247 | 11,620
Chongqing Gas Compressor Factory | 3,754 | 3,782 | 0 | 4,032 | 33 | 223 | 1,698 | 2,297
Huaxi General Machinery Company | 7,374 | 6,658 | 70 | 7,056 | -1,300 | -1,231 | 304 | 7,685
Shenyang Air Compressor Factory | 5,637 | 5,213 | 85 | 4,679 | 10 | 181 | 1,164 | 10,930
Tingtan Compressor Co., Ltd. | 1,038 | 1,323 | 0 | 1,170 | 31 | 113 | 363 | 2,306
In 1998, the entire industry sold a total of 1,317 types and 38,144 units of compressors of various sizes; the total motor power amounted to 1,434 MW. Compared to the same period last year, the number of product types, units sold, and total motor power decreased by 0.4%, 17%, and 88% respectively ； 598 types of micro-compressors, totaling 119,899 units, were sold, with a motor power of 263 MW. The number of product types, the total number of units, and the motor power all decreased by 19%, 80%, and 31%, respectively, compared to the same period last year. Key enterprises sold 662 types of compressors of various sizes, totaling 7,415 units, with a motor power of 799 MW. Apart from the number of types remaining unchanged, the number of units and the motor power decreased by 22% and 33% respectively compared to the previous year. Sales of micro compressors were 8,150 units and 12,895 units respectively, with motor power at 45 MW; these figures represented decreases of 22%, 30%, and 23% compared to the same period last year. In 1998, the overall industry product sales rate was 96.2%, 2.9 percentage points lower than the same period of the previous year ； The sales rate of products from key enterprises was 98.8%, 3.5 percentage points lower than the same period last year. Sales across the entire industry are on a downward trend; the decline in the production-sales ratio has led to an increase in finished goods inventory. Total output value dropped by 5.1%, while finished goods inventory increased by 0.7%. Among key enterprises, finished goods inventory rose by 4.6%. A summary of 77 companies shows that 36 of them have an increase in inventory levels. The opposite trends in output and inventory reflect the challenging situation faced by these companies in terms of production and operations. The products manufactured through loans remain piled up as inventory, leading to shortages of working capital, which indicates that the volume of products produced exceeds market demand. In 1998, the comprehensive economic efficiency index for the entire industry was 63.2%, a decrease of 18.1% compared to the same period the previous year ； The comprehensive index for key enterprises reached 60.9%, down 23.7% from the same period last year. Across the six regional groups, all composite indices declined, by amounts ranging from 5.3 to 44.3 percentage points. In terms of comprehensive economic benefits, the regions are ranked as follows: East China Group 1 at 88.9%, East China Group 2 at 72.7%, Central and South China Group at 58.1%, Northeast China Group at 48.6%, North China Group at 9.8%, and West China Group at 1.5%. Six out of the seven indicators used to compose the composite index showed values that were generally lower than those in the same period of the previous year across all six regions, and they were also below the industry standards set by the petrochemical sector. In 1998, the industry’s export earnings amounted to 79.4 million yuan, a 29.4% decrease compared to the same period the previous year. Nineteen enterprises in this sector exported 57,176 compressors to 37 countries and regions, with a 28.7% decline in the physical volume of exports. The company with the highest export volume remains Jiangsu Dali Group Co., Ltd., at 33.27 million yuan for 48,748 units, followed by Shenyang Gas Compressor Co., Ltd. with 13.13 million yuan. In the entire industry, only a little over 20 companies engage in foreign exports each year, which is not in line with the trend of economic globalization today. This situation is unfavorable for the development of these companies. It is necessary to adjust the product structure, take proactive actions, enter international markets, and seek new opportunities for growth in order to generate benefits for the companies. (The top 10 companies in terms of sales revenue and export value within the unemployed manufacturing sector are listed in Table 2.) Table 2: Top 10 companies in the compressor industry in terms of sales revenue and export value in 1998. Serial Number | Company Name | Sales Revenue (10,000 yuan) | Serial Number | Company Name | Sales Value (10,000 yuan) 1 | Shanghai Compressor Co., Ltd. | 38,889 | 1 | Jiangsu Dali Group Co., Ltd. | 3,327 2 | Shanghai Dalong Heavy Machinery Factory | 32,912 | 2 | Shenyang Gas Compressor Co., Ltd. | 1,313 | 3 | Shenyang Gas Compressor Co., Ltd. | 20,020 | 3 | Wuxi Compressor Co., Ltd. | 696 | 4 | Shandong Weifang Shengjian Group | 19,335 | 4 | Bengbu Compressor Factory | 662 | 5 | Wuxi Compressor Co., Ltd. | 15,952 | 5 | Nanjing Compressor Co., Ltd. | 388 | 6 | Liuzhou Compressor Factory | 14,237 | 6 | Wuxi No. 2 Compressor Factory | 301 | 7 | Liuzhou Compressor Factory | 12,440 | 7 | Dalian Gas Compressor Factory | 252 | 8 | Nanjing Compressor Co., Ltd. | 12,215 | 8 | Zhejiang Quzhou Coal Mining Machinery Factory | 247 | 9 | Jiangsu Dali Group Co., Ltd. | 11,000 | 9 | Yuyao General Group Company | 236 | 10 | Yuyao General Group Company | 10,070 | 10 | Shanghai Dongfang Compressor Factory | 175 In 1998, a total of 3,824 new models of compressors were developed and produced across the industry, with a production value of 374,550,000 yuan – a 4.3% decrease compared to the same period the previous year. The trend in new product development continued to be toward compressors used in petrochemical hydrogenation, reforming processes, nitrogen-hydrogen gas production, and other applications that require high levels of technical sophistication. The essence of companies entering market competition is product competition; products must be continuously updated to meet market demands. In 1998, Shenyang Gas Compressor Co., Ltd. developed 34 new products and over 60 sets of equipment. The large-scale hydrogen compressor 4M80 (50-30/22-200-BX) filled a gap in domestic production, replaced imported equipment, helped to save foreign exchange, and won the second prize for Torch Projects in Shenyang ； The 4M40-135.5/2.2-6.95-55.6/6.7-20-BX reformer hydrogen booster was awarded the second prize for Excellent Product by the Shenyang Economic and Trade Commission ； There have been significant breakthroughs in the new technology of off-center casting of cylinder liners and the new process of cryogenic assembly of connecting rod small-end bushes and connecting rod bodies. In 1998, Beijing No.1 General Machinery Factory completed the military technology appraisal for the GD2-120/35-350 type oxygen (nitrogen) filling mobile isolated compression machines, and won the Second Prize for Scientific and Technological Progress in Beijing. This aircraft is primarily used in air force units, training bases, aircraft testing centers, as well as aircraft repair shops, manufacturing plants, and civil aviation airports. It passed the military equipment technical evaluation conducted by the Air Force Equipment Department and the Military Industry Office of the **Mechanical Industry Bureau in October 1998. The scroll compressors developed by the Compressor Engineering Research Group at Xi’an Jiaotong University have made new advances in terms of the modified hyperbolic function scroll profiles, a dual-balancing system with a new type of moving mechanism, and braking mechanisms; significant progress has been achieved, in particular, in the research related to the manufacturing process of scroll air compressors. The Engineering Research Center jointly established Guangzhou Scroll Compressor Industrial Co., Ltd. in Panyu, Guangdong, with the mass production of 10 models including WXA-0.03/4, WXA-0.07/7, and WXA-0.45/8. The products feature stable quality and reliable performance, earning favorable reviews from users both at home and abroad. In 1998, Wuxi Compressor Co., Ltd. developed over 20 new products (including variant models). The second generation of oil injection rod compressors was developed, while microcomputer-controlled new models of screw compressors with capacities of 3 m3 (LGD-3.4/7–X type) and 6 m3 to 40 m3 were produced in bulk. The LGW-100/7-X dry screw compressor was awarded the third prize for scientific and technological progress in Wuxi City, and it received a national-level new product certificate after evaluation by the **Economic and Trade Commission**. The LGY--17/7 type mobile oil-injected screw compressor and the 0GF-3/7 type worm compressor developed by Liuzhou Compressor General Factory were designated as **-level technology development projects for 1998, with their performance metrics meeting the first-class and top-grade standards set by mechanical industry regulations. Nanjing Compressor Co., Ltd. has developed a high-pressure air compressor. The prototype was successfully manufactured on the first attempt, receiving positive feedback from experts and customers. Anshan Oil-Free Air Compressor Co., Ltd. utilizes advanced technologies such as new lubricating materials and special surface treatments for cylinder bodies. In 1998, it developed new products and variants, including the ZW-0.03/7-13 series, as well as the VW-2.05/7 and VW-0.11/7 series of directly coupled, completely oil-free lubricated air compressors ； WW-0.5/25, WW-0.7/306 high-pressure oil-free air compressors ； Oil-free vacuum pumps and oil-free bearings. Based on the absorption and adaptation of advanced technologies from the German company Demag, Bengbu Compressor Factory has designed and developed the V-1.5/3-250 and V-2/3-250-T types of compressors for filling natural gas cylinders. These compressors are equipped with explosion-proof motors, and systems for detecting anomalies in oil pressure, water pressure, temperature, as well as for controlling intake and exhaust at various stages, including one stage of intake and four stages of exhaust; they have passed provincial-level certification. Jiangsu Dali Group Co., Ltd. has collaborated with a research institute to develop the VW-0.42/7 oil-free, environmentally friendly air compressor. It has an exhaust volume of 0.4 m3/min, an exhaust pressure of 0.7 Mpa, and a motor power of 4 Kw. This type of compressor is widely used in the food and grain processing industries as well as in the medical and health sector, and it holds great potential for market development. The factory also utilizes CADA technology and has purchased 5 machining centers to improve its processing level and accelerate the development of new products. Liuzhou Second Air Compressor General Factory has independently developed the WW-42/7 oil-free lubricated compressor, which has a displacement of 42 m³/min and an exhaust pressure ranging from 0.7 Mpa to 0.8 Mpa. Its features include quick installation, W-shaped structure, double-acting operation, excellent dynamic balance performance, and the use of an internal spiral mesh tube high-efficiency cooler. In the three years since it was introduced to the market, 63 units of this machine have been sold, generating an output value of 17.12 million yuan and profits and taxes amounting to 6.87 million yuan. In 1998, it was awarded the Third Prize for Scientific and Technological Progress in Liuzhou City, and was designated as a **-level new product in 1998. In 1998, Chongqing Gas Compressor Factory designed and developed a new product: the ZW-2.3/400 type compressor. This is a double-W type, fixed-mounted compressor with 5 stages of compression, and an exhaust pressure of 40 Mpa. Xiangtan Compressor Co., Ltd. redefined its corporate image by optimizing its product portfolio and increasing the technological content of its products; it implemented a brand strategy and adopted an organizational structure that emphasized strength at both ends and precision in the middle. In 1998, the company developed 4m3 nitrogen-hydrogen gas circulation compressors as well as fire exhaust fans for high-rise buildings, and these products passed the inspections conducted by **Testing Center, which granted them the necessary certifications. In response to the needs of higher authorities and the desire to support the development of the automotive industry, Changde General Machinery Factory developed the ZW-0.1/7 type oil-free compressor for use in vehicles. This product offers significant advantages such as improved driving safety, reduced fuel consumption, and less environmental pollution. The compressor anti-contamination flash valves FW Type I, FW Type II, and FW Type III, innovatively developed by Wenzhou Rongde Valve Co., Ltd., have been granted **patents (Patent No.: 98211953.4). The practical advantage of the anti-fouling valve lies in its ability to ensure normal operation in complex gases containing dust, tar, activated carbon and other types of contaminants, as well as in extending its service life. It provides excellent anti-fouling performance and good energy-saving effects, making it an ideal replacement product.
Enterprise Name | Total Industrial Output Value (10,000 yuan) | Industrial Sales Value (10,000 yuan) | Product Sales Revenue (10,000 yuan) | Total Profit (10,000 yuan) | Total Profits and Taxes (10,000 yuan) | Industrial Added Value (10,000 yuan) | Average Balance of Net Fixed Assets (10,000 yuan) | Total | Of which: Export value
Total | 154,981 | 144,274 | 3,500 | 154,393 | 11 | 9,606 | 42,483 | 133,704
Shenyang Gas Compressor Co., Ltd. | 23,818 | 20,481 | 1,313 | 20,020 | 150 | 1,923 | 5,006 | 35,316
Beijing No.1 General Machinery Factory | 5,712 | 6,105 | 0 | 8,065 | -648 | -170 | 1,077 | 7,598
Shanghai Compressor Co., Ltd. | 35,150 | 31,308 | 0 | 38,889 | 1,001 | 3,241 | 8,768 | 11,397
Shanghai Dongfang Compressor Factory | 5,725 | 4,649 | 1,510 | 4,662 | 0 | 240 | 1,234 | 1,075
Jiangxi Gas Compressor Factory | 4,822 | 5,712 | 696 | 5,832 | 55 | 604 | 1,826 | 4,819
Wuxi Compressor Co., Ltd. | 14,370 | 15,952 | 388 | 15,952 | 503 | 1,646 | 5,536 | 9,890
Nanjing Compressor Co., Ltd. | 12,165 | 12,200 | 662 | 12,215 | 258 | 953 | 4,655 | 6,461
Bengbu Compressor General Factory | 7,253 | 5,954 | 0 | 5,144 | -488 | -111 | 2,654 | 2,939
Liuzhou Compressor General Factory | 13,290 | 12,404 | 135 | 12,440 | 92 | 741 | 3,951 | 19,371
Liuzhou No.2 Air Compressor General Factory | 13,883 | 12,532 | 0 | 14,237 | 314 | 1,253 | 4,247 | 11,620
Chongqing Gas Compressor Factory | 3,754 | 3,782 | 0 | 4,032 | 33 | 223 | 1,698 | 2,297
Huaxi General Machinery Company | 7,374 | 6,658 | 70 | 7,056 | -1,300 | -1,231 | 304 | 7,685
Shenyang Air Compressor Factory | 5,637 | 5,213 | 85 | 4,679 | 10 | 181 | 1,164 | 10,930
Tingtan Compressor Co., Ltd. | 1,038 | 1,323 | 0 | 1,170 | 31 | 113 | 363 | 2,306
In 1998, the entire industry sold a total of 1,317 types and 38,144 units of compressors of various sizes; the total motor power amounted to 1,434 MW. Compared to the same period last year, the number of product types, units sold, and total motor power decreased by 0.4%, 17%, and 88% respectively ； 598 types of micro-compressors, totaling 119,899 units, were sold, with a motor power of 263 MW. The number of product types, the total number of units, and the motor power all decreased by 19%, 80%, and 31%, respectively, compared to the same period last year. Key enterprises sold 662 types of compressors of various sizes, totaling 7,415 units, with a motor power of 799 MW. Apart from the number of types remaining unchanged, the number of units and the motor power decreased by 22% and 33% respectively compared to the previous year. Sales of micro compressors were 8,150 units and 12,895 units respectively, with motor power at 45 MW; these figures represented decreases of 22%, 30%, and 23% compared to the same period last year. In 1998, the overall industry product sales rate was 96.2%, 2.9 percentage points lower than the same period of the previous year ； The sales rate of products from key enterprises was 98.8%, 3.5 percentage points lower than the same period last year. Sales across the entire industry are on a downward trend; the decline in the production-sales ratio has led to an increase in finished goods inventory. Total output value dropped by 5.1%, while finished goods inventory increased by 0.7%. Among key enterprises, finished goods inventory rose by 4.6%. A summary of 77 companies shows that 36 of them have an increase in inventory levels. The opposite trends in output and inventory reflect the challenging situation faced by these companies in terms of production and operations. The products manufactured through loans remain piled up as inventory, leading to shortages of working capital, which indicates that the volume of products produced exceeds market demand. In 1998, the comprehensive economic efficiency index for the entire industry was 63.2%, a decrease of 18.1% compared to the same period the previous year ； The comprehensive index for key enterprises reached 60.9%, down 23.7% from the same period last year. Across the six regional groups, all composite indices declined, by amounts ranging from 5.3 to 44.3 percentage points. In terms of comprehensive economic benefits, the regions are ranked as follows: East China Group 1 at 88.9%, East China Group 2 at 72.7%, Central and South China Group at 58.1%, Northeast China Group at 48.6%, North China Group at 9.8%, and West China Group at 1.5%. Six out of the seven indicators used to compose the composite index showed values that were generally lower than those in the same period of the previous year across all six regions, and they were also below the industry standards set by the petrochemical sector. In 1998, the industry’s export earnings amounted to 79.4 million yuan, a 29.4% decrease compared to the same period the previous year. Nineteen enterprises in this sector exported 57,176 compressors to 37 countries and regions, with a 28.7% decline in the physical volume of exports. The company with the highest export volume remains Jiangsu Dali Group Co., Ltd., at 33.27 million yuan for 48,748 units, followed by Shenyang Gas Compressor Co., Ltd. with 13.13 million yuan. In the entire industry, only a little over 20 companies engage in foreign exports each year, which is not in line with the trend of economic globalization today. This situation is unfavorable for the development of these companies. It is necessary to adjust the product structure, take proactive actions, enter international markets, and seek new opportunities for growth in order to generate benefits for the companies. (The top 10 companies in terms of sales revenue and export value within the unemployed manufacturing sector are listed in Table 2.) Table 2: Top 10 companies in the compressor industry in terms of sales revenue and export value in 1998. Serial Number | Company Name | Sales Revenue (10,000 yuan) | Serial Number | Company Name | Sales Value (10,000 yuan) 1 | Shanghai Compressor Co., Ltd. | 38,889 | 1 | Jiangsu Dali Group Co., Ltd. | 3,327 2 | Shanghai Dalong Heavy Machinery Factory | 32,912 | 2 | Shenyang Gas Compressor Co., Ltd. | 1,313 | 3 | Shenyang Gas Compressor Co., Ltd. | 20,020 | 3 | Wuxi Compressor Co., Ltd. | 696 | 4 | Shandong Weifang Shengjian Group | 19,335 | 4 | Bengbu Compressor Factory | 662 | 5 | Wuxi Compressor Co., Ltd. | 15,952 | 5 | Nanjing Compressor Co., Ltd. | 388 | 6 | Liuzhou Compressor Factory | 14,237 | 6 | Wuxi No. 2 Compressor Factory | 301 | 7 | Liuzhou Compressor Factory | 12,440 | 7 | Dalian Gas Compressor Factory | 252 | 8 | Nanjing Compressor Co., Ltd. | 12,215 | 8 | Zhejiang Quzhou Coal Mining Machinery Factory | 247 | 9 | Jiangsu Dali Group Co., Ltd. | 11,000 | 9 | Yuyao General Group Company | 236 | 10 | Yuyao General Group Company | 10,070 | 10 | Shanghai Dongfang Compressor Factory | 175 In 1998, a total of 3,824 new models of compressors were developed and produced across the industry, with a production value of 374,550,000 yuan – a 4.3% decrease compared to the same period the previous year. The trend in new product development continued to be toward compressors used in petrochemical hydrogenation, reforming processes, nitrogen-hydrogen gas production, and other applications that require high levels of technical sophistication. The essence of companies entering market competition is product competition; products must be continuously updated to meet market demands. In 1998, Shenyang Gas Compressor Co., Ltd. developed 34 new products and over 60 sets of equipment. The large-scale hydrogen compressor 4M80 (50-30/22-200-BX) filled a gap in domestic production, replaced imported equipment, helped to save foreign exchange, and won the second prize for Torch Projects in Shenyang ； The 4M40-135.5/2.2-6.95-55.6/6.7-20-BX reformer hydrogen booster was awarded the second prize for Excellent Product by the Shenyang Economic and Trade Commission ； There have been significant breakthroughs in the new technology of off-center casting of cylinder liners and the new process of cryogenic assembly of connecting rod small-end bushes and connecting rod bodies. In 1998, Beijing No.1 General Machinery Factory completed the military technology appraisal for the GD2-120/35-350 type oxygen (nitrogen) filling mobile isolated compression machines, and won the Second Prize for Scientific and Technological Progress in Beijing. This aircraft is primarily used in air force units, training bases, aircraft testing centers, as well as aircraft repair shops, manufacturing plants, and civil aviation airports. It passed the military equipment technical evaluation conducted by the Air Force Equipment Department and the Military Industry Office of the **Mechanical Industry Bureau in October 1998. The scroll compressors developed by the Compressor Engineering Research Group at Xi’an Jiaotong University have made new advances in terms of the modified hyperbolic function scroll profiles, a dual-balancing system with a new type of moving mechanism, and braking mechanisms; significant progress has been achieved, in particular, in the research related to the manufacturing process of scroll air compressors. The Engineering Research Center jointly established Guangzhou Scroll Compressor Industrial Co., Ltd. in Panyu, Guangdong, with the mass production of 10 models including WXA-0.03/4, WXA-0.07/7, and WXA-0.45/8. The products feature stable quality and reliable performance, earning favorable reviews from users both at home and abroad. In 1998, Wuxi Compressor Co., Ltd. developed over 20 new products (including variant models). The second generation of oil injection rod compressors was developed, while microcomputer-controlled new models of screw compressors with capacities of 3 m3 (LGD-3.4/7–X type) and 6 m3 to 40 m3 were produced in bulk. The LGW-100/7-X dry screw compressor was awarded the third prize for scientific and technological progress in Wuxi City, and it received a national-level new product certificate after evaluation by the **Economic and Trade Commission**. The LGY--17/7 type mobile oil-injected screw compressor and the 0GF-3/7 type worm compressor developed by Liuzhou Compressor General Factory were designated as **-level technology development projects for 1998, with their performance metrics meeting the first-class and top-grade standards set by mechanical industry regulations. Nanjing Compressor Co., Ltd. has developed a high-pressure air compressor. The prototype was successfully manufactured on the first attempt, receiving positive feedback from experts and customers. Anshan Oil-Free Air Compressor Co., Ltd. utilizes advanced technologies such as new lubricating materials and special surface treatments for cylinder bodies. In 1998, it developed new products and variants, including the ZW-0.03/7-13 series, as well as the VW-2.05/7 and VW-0.11/7 series of directly coupled, completely oil-free lubricated air compressors ； WW-0.5/25, WW-0.7/306 high-pressure oil-free air compressors ； Oil-free vacuum pumps and oil-free bearings. Based on the absorption and adaptation of advanced technologies from the German company Demag, Bengbu Compressor Factory has designed and developed the V-1.5/3-250 and V-2/3-250-T types of compressors for filling natural gas cylinders. These compressors are equipped with explosion-proof motors, and systems for detecting anomalies in oil pressure, water pressure, temperature, as well as for controlling intake and exhaust at various stages, including one stage of intake and four stages of exhaust; they have passed provincial-level certification. Jiangsu Dali Group Co., Ltd. has collaborated with a research institute to develop the VW-0.42/7 oil-free, environmentally friendly air compressor. It has an exhaust volume of 0.4 m3/min, an exhaust pressure of 0.7 Mpa, and a motor power of 4 Kw. This type of compressor is widely used in the food and grain processing industries as well as in the medical and health sector, and it holds great potential for market development. The factory also utilizes CADA technology and has purchased 5 machining centers to improve its processing level and accelerate the development of new products. Liuzhou Second Air Compressor General Factory has independently developed the WW-42/7 oil-free lubricated compressor, which has a displacement of 42 m³/min and an exhaust pressure ranging from 0.7 Mpa to 0.8 Mpa. Its features include quick installation, W-shaped structure, double-acting operation, excellent dynamic balance performance, and the use of an internal spiral mesh tube high-efficiency cooler. In the three years since it was introduced to the market, 63 units of this machine have been sold, generating an output value of 17.12 million yuan and profits and taxes amounting to 6.87 million yuan. In 1998, it was awarded the Third Prize for Scientific and Technological Progress in Liuzhou City, and was designated as a **-level new product in 1998. In 1998, Chongqing Gas Compressor Factory designed and developed a new product: the ZW-2.3/400 type compressor. This is a double-W type, fixed-mounted compressor with 5 stages of compression, and an exhaust pressure of 40 Mpa. Xiangtan Compressor Co., Ltd. redefined its corporate image by optimizing its product portfolio and increasing the technological content of its products; it implemented a brand strategy and adopted an organizational structure that emphasized strength at both ends and precision in the middle. In 1998, the company developed 4m3 nitrogen-hydrogen gas circulation compressors as well as fire exhaust fans for high-rise buildings, and these products passed the inspections conducted by **Testing Center, which granted them the necessary certifications. In response to the needs of higher authorities and the desire to support the development of the automotive industry, Changde General Machinery Factory developed the ZW-0.1/7 type oil-free compressor for use in vehicles. This product offers significant advantages such as improved driving safety, reduced fuel consumption, and less environmental pollution. The compressor anti-contamination flash valves FW Type I, FW Type II, and FW Type III, innovatively developed by Wenzhou Rongde Valve Co., Ltd., have been granted **patents (Patent No.: 98211953.4). The practical advantage of the anti-fouling valve lies in its ability to ensure normal operation in complex gases containing dust, tar, activated carbon and other types of contaminants, as well as in extending its service life. It provides excellent anti-fouling performance and good energy-saving effects, making it an ideal replacement product.