Industrial Valve
Industrial valves are the core control components of fluid conveying systems. Through key functions such as on/off operation, regulation, diversion, check action, pressure stabilization, and relief, they achieve precise control and safe isolation of the flow of media including liquids, gases, and powders.
Darko is a professional industrial valves supplier. With a focus on quality and functionality, we also offer intelligent and technological designs, and can customize a complete design for you.
Choose the perfect ndustrial valves for your needs, whether it’s airlock valve, flap valve , discharge valve, damper valve, or slide gate. We offer large-scale customization services for all kinds of industrial valves to meet your specific requirements.
Types of Industrial Valves
This series of products is specifically designed to handle complex media such as powders, granules, and gas-solid two-phase flows, serving as core components in critical stages like pneumatic conveying, dust removal systems, and material processing. They ensure process sealing, smooth discharge, and controlled particle size, forming the cornerstone for enhancing overall system reliability and ensuring production continuity.
Featured Industrial Valves – Precisely Tackling High Temperatures, Corrosion, and Conveying Challenges
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The pneumatic flow control gate valve is designed for precise flow switching and regulation in powder and granular material conveying systems. Featuring hard alloy sealing pairs and a linear actuator, it achieves millimeter-level opening control and rapid shut-off. The valve’s dead-zone-free design prevents material buildup, making it ideal for process optimization and energy-saving control in mining, construction materials, and grain processing industries.
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The 316 stainless steel butterfly valve is designed for corrosive media, suitable for chemical, water treatment, and food industries. Featuring a triple-eccentric seal structure and PTFE valve seat, it achieves zero-leakage and low-torque operation, with corrosion resistance meeting ASTM standards. The compact valve body supports pneumatic/electric actuators for rapid response, optimizing fluid control efficiency.
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The high-temperature damper (flap/damper valve) is designed for high-temperature flue gas pipelines in boilers, kilns, and drying systems. The valve body is made of 310S stainless steel or heat-resistant alloys, withstanding temperatures up to 800°C. Its multi-layer sealing structure and heavy-duty bearing system ensure precise opening adjustment and long-term zero leakage even in high-temperature, high-dust environments.
Hot Industrial Valves
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As a critical airlock discharge unit in dust conveying and dedusting systems, this double flap valve is renowned for its superior sealing and wear resistance. It holds a total of 12 international certifications, covering ISO 15848-1 low leakage classification and ATEX explosion-proof requirements, ensuring system safety and energy efficiency. Its exceptional quality has secured repeat orders from heavy industry benchmarks such as China National Building Materials (cement kiln inlet dust collection) and Baowu Steel Group (blast furnace gas purification).
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As the heart of pneumatic and mechanical conveying systems, our rotary valve (rotary feeder) has become an industry benchmark due to its exceptional sealing and wear resistance. The product holds 18 international certifications, including ATEX explosion-proof and FDA food-grade approvals, ensuring absolute reliability in dust-explosive and hygiene-sensitive environments. An impressive 82% customer repurchase rate testifies to its outstanding quality, with proven performance in the core production lines of leading enterprises such as Huaxin Cement (raw meal dosing), Conch Cement (kiln tail conveying), and Sinoma Group (fly ash handling).
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Darko’s Two-Way Diverter Valve is a core component engineered for high-end industrial applications demanding explosion-proof safety and food-grade hygiene standards. The product is simultaneously certified to both ATEX explosion-proof and FDA food-grade certifications, enabling its seamless application across a wide range of fields—from chemical dust handling to clean conveying in pharmaceuticals and food processing. It meets the extreme operational requirements representative of industry benchmark enterprises in sectors such as advanced manufacturing and biopharmaceuticals.
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Engineered for accurate pressure control in flue gas ducts and ventilation systems, this damper is certified to ISO 15848 for low leakage and complies with CE/PED directives. Its core features a patented self-lubricating bearing system, enabling maintenance-free operation for up to 5 yearsand significantly reducing lifecycle costs. A 79% repurchase rate reflects its proven reliability, with successful deployments in major projects such as PowerChina (desulfurization systems), Shagang Group (sintering flue gas), and Danone China (drying line exhaust).
lobal Industrial Valve Solutions
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- Product Model: Rotary Valve ∮1200×1600
- Key Parameters:
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- Material: Cement raw meal (moisture 4–10%, poor fluidity)
- Conveying Capacity: 250 T/H
- Operating Condition: Mill internal negative pressure –60 to –80 mbar
- Wear-Resistant Design: Liner plate NM400, rotor Q235
- Drive: Motor 11 kW, speed 12 r/min
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- Product Model: ZSFF-00-720 Heavy Counterweight Air-Lock Flap Valve
- Key Parameters:
- Medium: High-temperature flue gas & dust (≤800°C continuous)
- Key Material: Valve plate 0Cr25Ni20 (310S), Body SUS304, 100mm castable lining
- Sealing Performance: Air leakage rate <3%, withstanding –800 to –1500 Pa negative pressure
- Compact Design: Overall dimensions 680×904×994 mm
- Application: Sinter machine tail dedusting system transformation
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- Project Scope: Complete valve package solution totaling 68 units
- Core Products:
- High-Temperature & High-Flow Butterfly Valves: 11 units (including specially designed Ø2500mm valves for 300℃ service)
- Dust Handling Valves: 36 units (manual butterfly valves, quick shut-off valves, explosion vents)
- Material Control Valves: 21 units (bar gate valves, flap valves, diverter valves, rotary discharge valves)
Production scale and quality assurance
- Hardware Facilities: Covers an area of over 90 acres, equipped with high-end equipment such as CNC machine tools imported from Germany and Japan, with fixed assets exceeding 90 million yuan.
- Production Capacity Assurance: Capable of supplying complete equipment for a 10,000 T/D cement production line.
- Quality Certification: Products comply with European EN standards and have been awarded the title of Jiangsu Province Famous Brand Product.
- Team Size: Employs 500 people, including 123 insured, with the technical team comprising several external experts.
Industry standing and technical strength
- Innovation Capability: Holds 17 patent technologies, demonstrating strong innovation ability.
- Compliance: Hold 3 administrative licenses and 7 industry qualification certificates to ensure product compliance.
- R&D Recognition: Recognized as a technology-based small and medium-sized enterprise (2024), with R&D capabilities officially acknowledged.
After-sale Service
Nantong Darko Building Materials Technology Co., Ltd. performed outstandingly in the 2025 domestic valve brand after-sales service rankings, with core advantages including rapid response and professional technical support.
- Dako Industrial Valves’ overseas projects are equipped with multilingual engineers, and key equipment comes with an extended maintenance warranty of 5 years.
- Dako Industrial Valves has established spare parts centers in multiple countries, providing technical solutions within 48 hours for cement plant failures, and has localized teams stationed in Middle Eastern projects.
- Dako Industrial Valves uses AR remote guidance and AI predictive maintenance, reducing downtime by 35%.
Customized industrial valves
- High temperature flap valve
- Rotary airlock feeder
- Zero leakage damper
| Models and specifications | Ability
（t/h） |
Power
（kw） |
D | H | A | B | C | Weight
（t） |
| EMV1200 | 220 | 9.2 | 1200 | 1600 | 1200 | 1400 | 1500 | 7.6 |
| EMV1600 | 320 | 11 | 1600 | 2200 | 1600 | 1800 | 3100 | 10.5 |
| EMV1800 | 550 | 15 | 1800 | 2500 | 1800 | 2000 | 3800 | 13 |
| EMV2000 | 600 | 18.5 | 2000 | 2800 | 2000 | 2200 | 4300 | 15.6 |
Project Case(The bypass damper beside the tail boiler of the Jiande Hongshi cement)
Before the replacement
- The actual import temperature is 330 degrees.
- The actual export temperature is 195 degrees.
- The actual bypass ‘s lower part temperature is 295 degrees.
- The actual inlet temperature of fan/blower is 220 degrees.
After the replacement
- The actual import temperature is 330 degrees.
- The actual export temperature is 215 degrees.
- The actual bypass ‘s lower part temperature is 145 degrees.
- The actual inlet temperature of fan/blower is 220 degrees.
Find the industrial valve solution that’s right for you
Industrial valves, as the core components of industrial control systems, their adaptability directly affects production safety, efficiency and cost control.
Whether you need on-site installation of industrial valves under extremely high temperatures and pressures, or large-scale procurement or non-standard customization to optimize costs, our industrial valves can offer high-performance, stable and reliable options. Meanwhile, all of our products are ISO and API certified and have undergone multiple stringent tests to ensure long-term operation in various industrial environments.
In order to provide you with an accurate quotation, could you please tell me the type and specifications of the industrial valves you need? The price may vary depending on the materials used, the size of the industrial valves and the quantity of the order.
However, we may be able to accommodate smaller orders depending on the product and availability.
If you need detailed technical manuals or data sheets, please feel free to contact us. We will be more than happy to assist you.
The core differences lie in their structure, flow resistance, and application scenarios.
- Butterfly Valve: The disc rotates 90° around the shaft to open/close. Pros: Compact, quick operation, low flow resistance, cost-effective. Cons: Not ideal for high differential pressure or slurry media with solids. Best for: Large-diameter, low-pressure systems requiring quick shut-off or regulation of water or air.
- Gate Valve: The gate moves vertically to block the medium. Pros: Full bore, minimal flow resistance, reliable sealing, high pressure rating. Cons: Slow operation, large dimensions, prone to sticking from scaling. Best for: Pipelines needing full flow, high pressure, and tight sealing for oil, gas, or clean water.
- Selection Rule of Thumb: “For regulation, quick shut-off, large diameter & low pressure – choose butterfly valve. For tight sealing, high pressure, clean liquids – choose gate valve.”
Material selection depends on the medium, temperature, pressure, and cost.
- Carbon Steel (WCB): Most common, suitable for non-corrosive media like water, oil, steam. Temperature range: -29°C to 425°C. Best cost-performance ratio.
- 304 Stainless Steel: General-purpose stainless, resists weak corrosives (seawater, atmosphere, organic acids). Standard for food and general chemical industries.
- 316 Stainless Steel: Contains molybdenum, offering far superior chloride resistance vs. 304. Standard for saltwater, chloride environments, pharmaceutical industry.
- Special Alloys: e.g., Monel (hydrofluoric acid resistance), Hastelloy (strong acid resistance) for extreme corrosion.
- Advice: Always provide the medium composition, concentration, and temperature to your supplier for final confirmation.
The choice depends on automation needs, power source, control precision, and budget.
• Manual: For infrequent operation, no power source, or tight budget. Simplest, but no remote control.
• Pneumatic: Fast operation, intrinsically safe for explosion-proof areas (no sparks), requires air supply. Preferred in chemical/petrochemical plants, ideal for on/off control.
• Electric: High torque, precise control (for modulation), requires electricity. Best for remote control and complex regulation, e.g., power plants, water treatment.
• Key Consideration: Beyond drive type, calculate the required output torque to match the valve.