DN100 Knife Gate Valve (4 Inch)

Why Choose DN100 Knife Gate Valve?

✓ Industry Standard Performance

• Proven 4-inch design optimized for medium-bore industrial applications
• Enhanced flow capacity (Cv 360) for maximum system efficiency
• Superior pressure handling capability up to 25 Bar

✓ Unmatched Reliability

• Field-proven performance in the harshest industrial environments
• Extended service life with reinforced components and advanced materials
• Zero-maintenance design reduces total cost of ownership

✓ Versatile Application Range

• Excellent performance in both clean and heavily contaminated media
• Handles fibrous materials, abrasive slurries, and corrosive chemicals
• Suitable for continuous operation and frequent cycling

✓ Premium Construction Options

• Wafer Type: 51mm face-to-face, cost-effective installation
• Lug Type: Independent mounting with superior maintenance access
• Flanged Type: 75mm face-to-face, maximum structural integrity and pressure capability

Technical Specifications

Configuration Options & Dimensions

Wafer Type DN100

• Face-to-Face: 51mm
• Weight: 25-32 kg
• Best For: Retrofit applications, space-constrained installations

Lug Type DN100

• Face-to-Face: 51mm
• Weight: 30-38 kg
• Best For: Dead-end service, easy maintenance, modular systems

Flanged Type DN100

• Face-to-Face: 75mm
• Weight: 35-48 kg
• Best For: High pressure, critical applications, permanent installations

Performance Data

Critical Industrial Applications

Mining & Metallurgical Processing

• Concentrate and tailings transport
• Flotation circuit isolation and control
• Thickener underflow and overflow systems
• Process water and reclaim circuits
• Acid mine drainage treatment

Municipal & Industrial Water Treatment

• Primary and secondary clarification
• Activated sludge and biological treatment
• Chemical feed and polymer systems
• Backwash and cleaning circuits
• Effluent discharge and reuse systems

Pulp & Paper Manufacturing

• Stock preparation and screening
• Bleaching and brightening systems
• Paper machine water systems
• Waste treatment and recovery
• Chemical recovery processes

Chemical & Petrochemical Industries

• Reactor isolation and emergency shutdown
• Catalyst handling and regeneration
• Slurry and viscous media transfer
• Waste treatment and neutralization
• Process cooling and heating circuits

Power Generation

• Coal and ash handling systems
• Flue gas desulfurization (FGD)
• Cooling tower and condenser systems
• Boiler feedwater treatment
• Waste heat recovery systems

Advanced Actuation & Control

Manual Operation Systems

• Heavy-Duty Handwheel: Ergonomic design with mechanical advantage
• Precision Gear Drive: 4:1 to 6:1 reduction for high-pressure applications
• Chainwheel Operation: Up to 6 meters chain length for elevated installations
• Extended Stem Designs: Custom lengths for buried service applications

Pneumatic Actuation Systems

• Fail-Safe Spring Return: Emergency positioning for critical applications
• Double Acting Control: Precise positioning with variable air supply
• High-Output Torque: Up to 3000 Nm for demanding applications
• Smart Pneumatic Positioners: Digital control with diagnostic capabilities

Electric Actuation Systems

• Multi-Turn Electric Motors: Variable speed with precise torque control
• Explosion-Proof Certification: ATEX/IECEx/CSA approved for hazardous areas
• Advanced Position Control: Servo-quality positioning with feedback
• Network Integration: Profibus, Foundation Fieldbus, HART, Modbus compatibility

Hydraulic Actuation (Special Applications)

• High-Force Output: Up to 5000 Nm for extreme service conditions
• Fail-Safe Accumulator Systems: Emergency operation capability
• Proportional Control: Precise throttling and positioning
• Subsea and Offshore Rated: Special sealing and materials

Advanced Materials Engineering

Body Materials Portfolio

• WCB: Carbon steel for standard industrial service
• WC6 (1.25Cr-0.5Mo): Enhanced temperature and hydrogen service
• WC9 (2.25Cr-1Mo): High temperature and pressure applications
• CF8 (304 SS): General corrosion resistance
• CF8M (316 SS): Superior chemical compatibility
• CF3M (316L SS): Low carbon for welding and severe corrosion
• Duplex 2205: High strength with excellent corrosion resistance
• Super Duplex 2507: Extreme corrosion resistance for offshore/marine
• Alloy 20: Exceptional chemical resistance
• Hastelloy C276: Ultimate corrosion resistance for severe chemical service

Advanced Gate Technology

• Standard Stainless: 304/316/316L with precision machined surfaces
• Through-Hardened: Heat treated for maximum wear resistance
• Stellite 6 Overlay: Cobalt-based hardfacing for extreme abrasion
• Tungsten Carbide Coating: Advanced coating for ultimate wear resistance
• Ceramic Coating: Alumina or zirconia for chemical resistance

Engineered Seat Systems

• High-Performance Elastomers:
  • EPDM: General service (-20°C to +120°C)
  • NBR: Petroleum products (-40°C to +100°C)
  • FKM (Viton): Chemical resistance (-26°C to +200°C)
  • FFKM (Kalrez): Ultimate chemical resistance (-15°C to +250°C)
  • HNBR: Enhanced oil and chemical resistance
• Metal Seat Technology:
  • Stellite 6: Standard metal seating
  • Stellite 21: Enhanced corrosion resistance
  • Inconel 625: High temperature applications
  • Custom alloys for specific applications

Quality Excellence & Compliance

Manufacturing Standards

• ISO 9001:2015 – Quality Management System
• ISO 14001:2015 – Environmental Management
• API Q1 9th Edition – Quality management for petroleum industry
• PED 2014/68/EU – Pressure Equipment Directive
• ASME Section VIII – Pressure vessel code compliance

Testing & Validation Protocols

• Pressure Testing: Shell test at 1.5× working pressure, seat test at 1.1× working pressure
• Advanced Leakage Testing: Helium mass spectrometer testing available
• Torque Validation: Operating, seating, and break torque verification
• Extended Cycle Testing: 50,000+ cycle endurance validation
• Material Verification: PMI, mechanical properties, corrosion testing

Global Certifications

🔥 API 607/6FA – Fire testing and emergency sealing
⚡ ATEX 2014/34/EU – European explosive atmosphere directive
🇺🇸 CSA/UL – North American electrical and safety standards
🌊 NSF/ANSI 61 – Drinking water system components
🏭 NACE MR0175/ISO 15156 – Sour service environments
📋 ISO 15848-1 – Fugitive emissions testing
🍎 FDA 21 CFR 177 – Food contact applications
⚓ DNV GL – Marine and offshore applications

Installation & Service Excellence

Installation Requirements

• Pipeline Configuration: 8D upstream, 4D downstream straight pipe recommended
• Support Requirements: Independent structural support for flanged configurations
• Orientation Capability: 360° installation orientation capability
• Access Requirements: 500mm minimum clearance for maintenance access

Predictive Maintenance Program

• Condition Monitoring: Vibration, temperature, and torque trending
• Smart Diagnostics: Actuator health monitoring and fault prediction
• Scheduled Inspections: Customized maintenance intervals based on service conditions
• Component Life Tracking: Predictive replacement scheduling

Global Service Network

• Service Centers: 65+ authorized centers across 6 continents
• Emergency Response: 24/7/365 technical support and rapid deployment
• Field Service Teams: Factory-trained technicians for on-site service
• Training Academy: Comprehensive programs for operators and maintenance personnel

Digital Service Platform

• Remote Monitoring: IoT-enabled condition monitoring
• Digital Twin Technology: Virtual valve modeling for optimization
• Augmented Reality: AR-assisted maintenance and troubleshooting
• Blockchain Documentation: Immutable service and certification records

Technical Dimensions & Standards

Standard Dimensions (Multiple Pressure Classes)

International Flange Standards Compatibility

Performance Validation & Case Studies

Independent Testing Results

• Cycle Life Testing: >50,000 cycles in mining tailings service
• Seat Integrity: Zero leakage maintained after 25,000 cycles
• Torque Stability: <3% variation over 10,000 cycle test
• Corrosion Testing: 316L SS validated for >25 years in seawater service

Real-World Performance Data

• Copper Mine (Chile): 8 years continuous operation, zero unscheduled maintenance
• Paper Mill (Finland): 50,000+ cycles/year, original components still in service
• Wastewater Plant (USA): 15+ years operation with only scheduled maintenance
• Chemical Plant (Germany): Severe chemical service with custom Hastelloy construction

Third-Party Validation

• University Research: Independent flow and cavitation studies
• Industry Testing Labs: Accelerated life testing and failure analysis
• Customer Validation: Long-term field testing programs
• Regulatory Approval: Multiple international agency certifications

Competitive Excellence

🏆 Industry Leadership – #1 choice for medium-bore industrial applications
⚡ Superior Performance – Highest Cv rating in class for maximum flow efficiency
🛡️ Proven Reliability – Extensive field validation across all major industries
🔬 Advanced Materials – Widest selection of specialty alloys and coatings
🌍 Global Support – Comprehensive service network with local expertise
📦 Rapid Delivery – Standard and custom configurations with industry-leading lead times
💡 Innovation Leader – Continuous R&D investment in next-generation valve technology
🎓 Technical Expertise – Application engineering support for complex requirements

Get Your DN100 Industrial Solution

Ready to optimize your critical 4-inch industrial systems? Our DN100 specialists provide comprehensive application engineering and support for your most demanding process requirements.