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About Us
Guangzhou Weiton is an industrial gas system manufacturer integrating scientific research and development, manufacturing, sales and service. Its three brands include Weiton Industrial Gases,
  • 广州维通再次入围中储粮指定供货商
    发布时间： 2017 - 11 - 14
    广州维通再次入围中储粮 指定供货商2017年10月，维通再次成功入围中国储备粮管理总公司变压吸附式制氮设备指定供货商。维通2007-2017连续十年为中国绿色储粮事业提供优质、节能、高效的变压吸附制氮系统，十年间凭借先进的专业技术、过硬的产品质量以及优质的售前售后服务博得了广大储粮用户的普遍认可。能够连续入围不仅仅是中储粮总公司乃至整个粮食行业对维通的认可，同时也是公司综合实力及企业信誉的良好表现，我公司将秉承一贯的实事求是态度及良好的工作作风，认真努力地完成本次采购范围内的各项工作，为中国粮食储存绿色工程、良心工程、放心工程继续添砖加瓦！中储粮总公司粮食仓储设备招标入围项目入围结果公示：http://fwgs.sinograin.com.cn/articles/48546
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  • 制氮机常见故障及处理
    发布时间： 2009 - 04 - 20
    一：故障现象:    其中一塔排气不彻底原因:    1.单向阀漏气    2.反吹阀开启过大处理:    1.更换单向阀或内密封圈    2.调节反吹阀开启量 二：故障现象:    纯度下降原因:    1.吸附压力过高(0.8Mpa)    2.吸附压力过低(    3.吸附压力不稳    4.气源含水油量过多    5.进气量过大使压力上升过快    6.出气部分接口漏气    7.分子筛中毒处理:    1.减少进气压力    2.加大进气压力    3.进气口加个储罐    4.入口前加装油水分离器    5.调节入口调节阀，减少进气量。    6.取下重新插接    7.更换分子筛 三：故障现象:    氮气机不工作原因:    1.电源指示灯不亮。    2.电源插头或插座无电。处理:    1.检查保险丝是否正常（保险的位置在电源线与氮气机插座的下端）。用一字螺丝刀轻轻向外一挑就可把保险取出。有两个保险，一个在用一个备用，必要时更换...
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News
Release daily information of the company, frontier information of gas industry, application knowledge of equipment industry, common faults and daily maintenance plan, etc.
  • Nitrogen producing devices
    发布时间： 2019 - 06 - 03
    Nitrogen flowrate: 1 - 6000m³/hNitrogen purity: 95% - 99.9995% （100% - oxygen content）Dew point:  ≤- 45℃（- 70 ℃ can be customized）Nitrogen pressure: 0.5~6Bar，adjustableSuitable environment: temperature -15～45℃    humidityCompressed air conditions:Temperature: 0-30℃Pressure: 7.0-8.0Bar   Pressure dew point:Others: dust ≤ 0.01 μm   No oil, VOC and components of sulfur and nitro※Declaration when ordering if beyond the operating range※Too high temperature of the gas supplied will reduce the production capacity
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  • Nitrogen Producing System Specially for Green Grain Storage
    发布时间： 2019 - 06 - 18
    Nitrogen flowrate:1 - 6000m³/hrNitrogen purity: 95 %-99.9995 %（100 %-oxygen content）Dew point:  ≤ -45℃Nitrogen pressure: 0.05 ~ 6.5 bar, adjustableSuitable environment: temperature -15 ~ 35 ℃   humidity Conditions of compressed air:Temperature：0-30℃ Pressure：7.0-8.0Bar    Pressure dew point：Others：Dust ≤0.01μm   No oil,VOC and components of sulfur and nitro ※ Declaration when ordering if beyond the operating range.
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  • Oxygen-producing devices
    发布时间： 2019 - 06 - 18
    Oxygen flowrate：1-200m³/hOxygen purity：30%-95%Dew point： ≤-45℃Oxygen pressure: 0.01 ~ 4.0 bar, adjustableSuitable Environment: temperature -15 ~ 35 ℃   humidity Conditions of compressed air：Temperature: 0 - 25 ℃ Pressure: 4.5 - 5 bar    Pressure dew point: Other: dust ≤ 0.01 μm   No oil, VOC and components of sulfur and nitro ※ Declaration when ordering if beyond the operating range
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  • VPSA Oxygen Generator
    发布时间： 2019 - 06 - 18
    Oxygen flowrate：100-3000m³/hOxygen purity：30%-95%Dew point： ≤-45℃Oxygen pressure: 0.1 ~ 0.6 bar, adjustableSuitable Environment: temperature -15 ~ 35 ℃, humidity Conditions of compressed air：Temperature: 0-30℃ Pressure: 4.5-5Bar    Pressure dew point: Other: dust ≤ 0.01 μm   No oil, VOC and components of sulfur and nitro※ Declaration when ordering if beyond the operating range
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  • Purifying device of hydrogen-removed oxygen
    发布时间： 2019 - 06 - 18
    Oxygen concentration of feed：Feed pressure：0.3MPa～0.7MPaResidue index:0xygen content：≤1ppmHydrogen content ≤ 1000 ppm (Exception to hydrogen purification project)Dust：≤0.01μmDew point：≤-60℃
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  • Environment-protecting refrigerating dryer
    发布时间： 2019 - 06 - 19
    Air capacity：0.5 - 110 Nm³/min (may be customized)Inlet pressure: 0.2 - 1.0 MPa (may be customized)Inlet temperature：low-temperature type  ≤ 45 ℃, High-temperature type  ≤ 80 ℃Cooling mode: air-cooling (water-cooling)Pressure dew point : 3 - 10 ℃ (0.7 MPa)Refrigerant: R134a, R404a, R507, etc., optional Pressure loss: 0.02 MPaTemperature of cooling water: ≤ 32 ℃ (water-cooling)Pressure of cooling water: 0.2 MPa - 0.4 MPa (water-cooling)Installation environment: dry, well-ventilated, dust-free place※Declaration when ordering if beyond the operating range.
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  • Non-thermal adsorption dryer
    发布时间： 2019 - 06 - 11
    Rated operating pressure: 0.7 - 1.0 MPa (Customized for special pressure)Rated operating pressure: 0.7 - 1.0 MPa (Customized for special pressure)Capacity1-150Nm³/minPressure loss≦0.02MPaInlet pressure0.45-1.0MPaAdsorbentAlumina/molecular sieveInlet temperature≦38℃Cycle time10min（adjustable）Inlet oil content0.08ppm(0.1mg/m³)Control modeAutomatic controlDew point of outlet gas -40～-60℃(Normal pressure)InstallationIndoor, no foundation installation is allowedDust in outlet gas≦60μmPower supply1Ph/220V/50HzAverage loss of regeneration gas10%-14%Power20-100W
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  • Combination adsorption dryer
    发布时间： 2019 - 06 - 11
    Ambient temperature℃Cooling typeAir-cooling, Water-coolingInlet pressure0.45-1.0MPaAdsorbentAlumina/molecular sieveInlet temperature≦38℃Inlet oil content0.01ppmPressure loss≦0.02MPaRefrigerantR22、R407, etcDew pointof outlet air -40～-60℃(Normal pressure)InstallationIndoor, no foundation installation is allowedDust in Outlet air≦1μmCycle time10min/1h/2h(Adjustable）Average loss of regeneration gas3%-7%Power supply3Ph/380V1Ph/220V
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  • Micro-thermal adsorption dryer
    发布时间： 2019 - 06 - 11
    Main technique parametersMain technique parametersRating capacity7-200Nm3/minPressure loss≦0.02MPaInlet pressure0.45-1.0MPaAdsorbentAlumina/molecular sieveInlet temperature≦380CRegenerative wayMicro-thermal regenerationInlet oil content0.08ppm(0.1mg/m3)Control modeAutomatic controlDew point of outlet air -40～-600C(Normal pressure)InstallationIndoor, no foundation installation is allowedDust in outlet air≦60μmPower supply1Ph/220VAverage loss of regeneration air5%-8%
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  • Refrigerating dryer
    发布时间： 2019 - 06 - 11
    Air capacity：0.85-210Nm³/minInlet pressure：0.2MPa-1.0MPaInlet temperature：type of low temperature ≤ 45 ℃, type of high temperature ≤ 80 ℃Cooling mode: air cooling (water cooling)Pressure dew point: 2 - 10 ℃ (0.7 MPa)Refrigerant：R22Pressure loss：0.02MPaTemperature of cooling water: ≤ 32 ℃ (water cooling)Pressure of cooling water: 0.2 MPa - 0.4 MPa (water cooling)Installation environment: dry, well-ventilated, dust-free place※ Declaration when ordering if beyond the operating range.
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Product Center
At present, it has a complete industrial chain of production, including: gas separation, pressure vessels, products of gas purification, products of gas refine and gas proportion, etc.
Technical centre
Release daily information of the company, frontier information of gas industry, application knowledge of equipment industry, common faults and daily maintenance plan, etc.
Contact Us
Guangzhou Weiton is located in Baiyun district of Guangzhou, there being expressway entrance/exit, near Baiyun airport, conveniently in transport. Warmly welcome you to visit the company.
Sales centre
Professional sales engineers cooperate with customers to verify and design their projects, and provide relevant technical data and data analysis. Arrange technicians to conduct preliminary relevant technical data and data analysis. Arrange technicians to conduct preliminarynal sales engineers cooperate with customers to verify and design their projects, and provide relevant technical data and data analysis. Arrange technicians to conduct preliminary relevant technical data and data analysis. Arrange technicians to conduct preliminary
  • 测试能力
    发布时间： 2014 - 07 - 01
    专业的研发团队，领先的科技人才,潜心向前，打造.....
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  • 技术研发
    发布时间： 2014 - 07 - 01
    专业的研发团队，领先的科技人才,潜心向前，打造.....
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  • 实验装备
    发布时间： 2014 - 07 - 01
    专业的研发团队，领先的科技人才,潜心向前，打造.....
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Brands
Guangzhou Weiton Industrial Gas Technology Co., Ltd.
Guangzhou Weiton Industrial Gas Technology Co., Ltd.
Weiton Industrial Gas is a well-known enterprise of air separation and air post treatment, specializing in manufacturing nitrogen production system, oxygen production system, gas purification and gas proportion, mastering the core techniques of energy saving, and leading the area in R&D of low energy-consuming technology.
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Classic Case
  • <p style="line-height: normal;">Nitrogen producing system with carbon-removed oxygen purification</p><p style="line-height: normal;">Many sets of NP9999-235C NTC-500</p><p style="line-height: normal;">2008, being operated for 11 years</p><p style="line-height: normal;">Electronic Components</p><p style="line-height: normal;">Thailand</p>
    Electronic ComponentsDetails

    Nitrogen producing system with carbon-removed oxygen purification

    Many sets of NP9999-235C NTC-500

    2008, being operated for 11 years

    Electronic Components

    Thailand
  • <p style="line-height: normal;">Nitrogen producing system</p><p style="line-height: normal;">3 sets of NP9999-500B</p><p style="line-height: normal;">2007, being operated for 16 years</p><p style="line-height: normal;">Rubber Tire</p><p style="line-height: normal;">Guangzhou China</p><p><br/></p>
    Rubber TireDetails

    Nitrogen producing system

    3 sets of NP9999-500B

    2007, being operated for 16 years

    Rubber Tire

    Guangzhou China
  • <p style="line-height: normal;">Nitrogen producing system</p><p style="line-height: normal;">6 sets of NP9999-150B</p><p style="line-height: normal;">2012, being operated for 7 years</p><p>SMT</p><p style="line-height: normal;">Suzhou China</p>
    SMTDetails

    Nitrogen producing system

    6 sets of NP9999-150B

    2012, being operated for 7 years

    SMT

    Suzhou China
  • <p style="line-height: normal;">Nitrogen producing system</p><p style="line-height: normal;">NP9999-300B</p><p style="line-height: normal;">2010, being operated for 9 years</p><p style="line-height: normal;">Cathode materials of lithium cells</p><p style="line-height: normal;">Jiangmen China</p><p><br/></p>
    Cathode materials of lithium cellsDetails

    Nitrogen producing system

    NP9999-300B

    2010, being operated for 9 years

    Cathode materials of lithium cells

    Jiangmen China
  • <p style="line-height: normal;">Nitrogen producing system with carbon-removed oxygen purification</p><p style="line-height: normal;">Many sets of NP9999-235C NTC-500</p><p style="line-height: normal;">2008, being operated for 11 years</p><p>Electronic components</p><p style="line-height: normal;">Thailand<br/></p><p><br/></p>
    Electronic componentsDetails

    Nitrogen producing system with carbon-removed oxygen purification

    Many sets of NP9999-235C NTC-500

    2008, being operated for 11 years

    Electronic components

    Thailand
  • <p style="line-height: normal;">Nitrogen producing system</p><p style="line-height: normal;">NP9999-15B</p><p style="line-height: normal;">2009, being operated for 10 years</p><p style="line-height: normal;">Aluminium industry</p><p style="line-height: normal;">Foshan China</p>
    Aluminium industryDetails

    Nitrogen producing system

    NP9999-15B

    2009, being operated for 10 years

    Aluminium industry

    Foshan China
  • <p style="line-height: normal;">Nitrogen producing system</p><p>NP98-150B </p><p style="line-height: normal;">2008, being operated for 11 years</p><p style="line-height: normal;">chemical industry</p><p style="line-height: normal;">Kuala Lumpur, Malaysia</p><p><br/></p>
    chemical industryDetails

    Nitrogen producing system

    NP98-150B 

    2008, being operated for 11 years

    chemical industry

    Kuala Lumpur, Malaysia
  • <p style="line-height: normal;">Nitrogen producing system</p><p style="line-height: normal;">NPII-80B</p><p style="line-height: normal;">2011, being operated for 8 years</p><p style="line-height: normal;">New energy</p><p style="line-height: normal;">Chengdu China</p><p><br/></p>
    New energyDetails

    Nitrogen producing system

    NPII-80B

    2011, being operated for 8 years

    New energy

    Chengdu China
  • <p style="line-height: normal;">Nitrogen producing system</p><p style="line-height: normal;">NP999-200B</p><p style="line-height: normal;">2012, being operated for 7 years</p><p style="line-height: normal;">Oil processing</p><p style="line-height: normal;">Guangzhou China</p><p><br/></p>
    Oil processingDetails

    Nitrogen producing system

    NP999-200B

    2012, being operated for 7 years

    Oil processing

    Guangzhou China
  • <p style="line-height: normal;">Nitrogen producing system</p><p style="line-height: normal;">NP999-10B</p><p style="line-height: normal;">2008, being operated for 11 years</p><p style="line-height: normal;">Electronic Components</p><p style="line-height: normal;">Vietnam and Japan</p><p><br/></p>
    Electronic componentsDetails

    Nitrogen producing system

    NP999-10B

    2008, being operated for 11 years

    Electronic Components

    Vietnam and Japan
  • <p style="line-height: normal;">Nitrogen producing system</p><p style="line-height: normal;">200 sets of NP995-B series</p><p style="line-height: normal;">Since 2007，being operated</p><p style="line-height: normal;">Grain storage</p><p style="line-height: normal;">China' title='Grain storage' />
    Grain storageDetails

    Nitrogen producing system

    200 sets of NP995-B series

    Since 2007，being operated

    Grain storage

    China's grain depot system
  • <p style="line-height: normal;">Nitrogen producing system</p><p style="line-height: normal;">3 sets of NP9999-100B</p><p style="line-height: normal;">2008, being operated for 11 years</p><p style="line-height: normal;">Rare earth materials</p><p style="line-height: normal;">Ganzhou China</p><p><br/></p>
    Rare earth materialsDetails

    Nitrogen producing system

    3 sets of NP9999-100B

    2008, being operated for 11 years

    Rare earth materials

    Ganzhou China
  • <p style="line-height: normal;">Nitrogen producing system with carbon-removed oxygen purification</p><p style="line-height: normal;">NP9999-50B NTC-50</p><p style="line-height: normal;">2006, being operated for 13 years</p><p style="line-height: normal;">Semiconductor packaging</p><p style="line-height: normal;">Hong Kong China</p><p><br/></p>
    Semiconductor packagingDetails

    Nitrogen producing system with carbon-removed oxygen purification

    NP9999-50B NTC-50

    2006, being operated for 13 years

    Semiconductor packaging

    Hong Kong China
  • <p style="line-height: normal;">Nitrogen producing system</p><p style="line-height: normal;">NP99-150B</p><p style="line-height: normal;">2010, being operated for 9 years</p><p style="line-height: normal;">Fire-fighting equipment</p><p style="line-height: normal;">Foshan, China</p><p><br/></p>
    Fire-fighting equipmentDetails

    Nitrogen producing system

    NP99-150B

    2010, being operated for 9 years

    Fire-fighting equipment

    Foshan, China
  • <p style="line-height: normal;">Nitrogen producing system</p><p style="line-height: normal;">NP9999-100B</p><p style="line-height: normal;">2007, being operated for 12 years</p><p style="line-height: normal;">Electronic Components</p><p style="line-height: normal;">Busan, R. O. Korea</p><p><br/></p>
    Electronic componentsDetails

    Nitrogen producing system

    NP9999-100B

    2007, being operated for 12 years

    Electronic Components

    Busan, R. O. Korea
  • <p style="line-height: normal;">Nitrogen producing system with carbon-removed oxygen purification</p><p style="line-height: normal;">NP999-150，NTC-200</p><p style="line-height: normal;">2005-2015，had been operated</p><p style="line-height: normal;">Crystal silicon wafer</p><p style="line-height: normal;">Hong Kong China</p><p><br/></p>
    Crystal silicon waferDetails

    Nitrogen producing system with carbon-removed oxygen purification

    NP999-150，NTC-200

    2005-2015，had been operated

    Crystal silicon wafer

    Hong Kong China
  • <p style="line-height: normal;">Nitrogen producing system</p><p style="line-height: normal;">two sets of NP999-1300B</p><p style="line-height: normal;">2009, being operated for 10 years</p><p style="line-height: normal;">Chemical PTA</p><p style="line-height: normal;">Maoming China</p><p><br/></p>
    Chemical PTADetails

    Nitrogen producing system

    two sets of NP999-1300B

    2009, being operated for 10 years

    Chemical PTA

    Maoming China
  • <p style="line-height: normal;">Nitrogen producing system</p><p>18 sets of NP999-120B</p><p style="line-height: normal;">2008, being operated for 11 years</p><p style="line-height: normal;">Lithium battery</p><p style="line-height: normal;">Tianjin China</p><p><br/></p>
    Lithium batteryDetails

    Nitrogen producing system

    18 sets of NP999-120B

    2008, being operated for 11 years

    Lithium battery

    Tianjin China
  • <p style="line-height: normal;">Nitrogen producing system with carbon-removed oxygen purification</p><p style="line-height: normal;">NP9999-250C  NTC-250</p><p style="line-height: normal;">2001 - 2008, had been operated</p><p style="line-height: normal;">Powder metallurgy</p><p style="line-height: normal;">Jiangmen China</p><p><br/></p>
    Powder metallurgyDetails

    Nitrogen producing system with carbon-removed oxygen purification

    NP9999-250C  NTC-250

    2001 - 2008, had been operated

    Powder metallurgy

    Jiangmen China
  • <p style="line-height: normal;">Nitrogen producing system</p><p style="line-height: normal;">NP9999-100B</p><p style="line-height: normal;">2007, being operated for 12 years</p><p style="line-height: normal;">Electronic Components</p><p style="line-height: normal;">Samsung, South Korea</p><p><br/></p>
    Electronic componentsDetails

    Nitrogen producing system

    NP9999-100B

    2007, being operated for 12 years

    Electronic Components

    Samsung, South Korea
  • <p style="line-height: normal;">Oxygen producing system</p><p style="line-height: normal;">OP93-100</p><p style="line-height: normal;">2007, being operated for 12 years</p><p style="line-height: normal;">Garbage power generation</p><p style="line-height: normal;">Guangzhou China </p><p><br/></p>
    Garbage power generationDetails

    Oxygen producing system

    OP93-100

    2007, being operated for 12 years

    Garbage power generation

    Guangzhou China 
  • <p style="line-height: normal;">Nitrogen producing system with carbon-removed oxygen purification</p><p style="line-height: normal;">NP9999-400C NTC-400 Lease</p><p style="line-height: normal;">2002 -2011，had been operated</p><p style="line-height: normal;">Chemical DOP</p><p style="line-height: normal;">Zhenjiang China</p><p><br/></p>
    Chemical DOPDetails

    Nitrogen producing system with carbon-removed oxygen purification

    NP9999-400C NTC-400 Lease

    2002 -2011，had been operated

    Chemical DOP

    Zhenjiang China
  • <p style="line-height: normal;">Nitrogen producing system with carbon-removed oxygen purification</p><p style="line-height: normal;">Many sets of NP9999-235C NTC-500</p><p style="line-height: normal;">2008, being operated for 11 years</p><p style="line-height: normal;">Electronic Components</p><p style="line-height: normal;">Latvia</p><p><br/></p>
    Electronic ComponentsDetails

    Nitrogen producing system with carbon-removed oxygen purification

    Many sets of NP9999-235C NTC-500

    2008, being operated for 11 years

    Electronic Components

    Latvia
  • <p style="line-height: normal;">Carbon-removed oxygen purification system</p><p style="line-height: normal;">NTC-400</p><p style="line-height: normal;">2003, being operated for 16 years</p><p style="line-height: normal;">Semiconductor packaging</p><p style="line-height: normal;">Shanwei China</p>
    Semiconductor packagingDetails

    Carbon-removed oxygen purification system

    NTC-400

    2003, being operated for 16 years

    Semiconductor packaging

    Shanwei China
  • <p style="line-height: normal;">Nitrogen producing system</p><p style="line-height: normal;">24 sets of NP9999-100B</p><p>2005, being operated for 14 years</p><p style="line-height: normal;">SMT</p><p style="line-height: normal;">Dongguan/Shenzhen China</p><p><br/></p>
    SMTDetails

    Nitrogen producing system

    24 sets of NP9999-100B

    2005, being operated for 14 years

    SMT

    Dongguan/Shenzhen China
  • <p style="line-height: normal;">Nitrogen producing system with carbon-removed oxygen purification</p><p style="line-height: normal;">Many sets of NP9999-235C NTC-500</p><p style="line-height: normal;">2008, being operated for 11 years</p><p style="line-height: normal;">Electronic Components</p><p style="line-height: normal;">Taiwan, China</p><p><br style="white-space: normal;"/></p><p><br/></p>
    Electronic ComponentsDetails

    Nitrogen producing system with carbon-removed oxygen purification

    Many sets of NP9999-235C NTC-500

    2008, being operated for 11 years

    Electronic Components

    Taiwan, China
  • <p style="line-height: normal;">Nitrogen producing system</p><p style="line-height: normal;">NP9999-120B</p><p style="line-height: normal;">2009, being operated for 10 years</p><p>Automobile materials</p><p style="line-height: normal;">Guangzhou China</p><p><br/></p>
    Automobile materialsDetails

    Nitrogen producing system

    NP9999-120B

    2009, being operated for 10 years

    Automobile materials

    Guangzhou China
  • <p style="line-height: normal;">Nitrogen producing system with carbon-removed oxygen purification</p><p style="line-height: normal;">NP999-150，NTC-200</p><p style="line-height: normal;">2005-2015，had been operated</p><p style="line-height: normal;">Crystal silicon wafer</p><p style="line-height: normal;">Hong Kong China</p><p><br/></p>
    Crystal silicon waferDetails

    Nitrogen producing system with carbon-removed oxygen purification

    NP999-150，NTC-200

    2005-2015，had been operated

    Crystal silicon wafer

    Hong Kong China
  • <p style="line-height: normal;">Nitrogen producing system with carbon-removed oxygen purification</p><p style="line-height: normal;">NP9999-400C NTC-400 Leased</p><p style="line-height: normal;">2006, being operated for 13 years</p><p>Chemical DOP</p><p style="line-height: normal;">Zhenjiang China</p><p><br/></p>
    Chemical DOPDetails

    Nitrogen producing system with carbon-removed oxygen purification

    NP9999-400C NTC-400 Leased

    2006, being operated for 13 years

    Chemical DOP

    Zhenjiang China
  • <p style="line-height: normal;">Oxygen producing system</p><p style="line-height: normal;">VPSAO-210-2B</p><p style="line-height: normal;">2007, had been operated</p><p style="line-height: normal;">Paper making</p><p style="line-height: normal;">Changsha China</p><p><br/></p><p><br/></p>
    Paper makingDetails

    Oxygen producing system

    VPSAO-210-2B

    2007, had been operated

    Paper making

    Changsha China
  • <p><span style="font-size:13px;font-family:Nitrogen producing system

    200 sets of NP995-B series

    Since 2010，being operated

    Grain storage

    China's local grain depot system


    ' title='Grain storage' />
    Grain storageDetails

    Nitrogen producing system

    200 sets of NP995-B series

    Since 2010，being operated

    Grain storage

    China's local grain depot system
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