DN150 Knife Gate Valve (6 Inch)

Technical Specifications

Basic Parameters

• Nominal Diameter: DN150 (6 inches)
• Connection Type: Flanged, Wafer, Lug style, Welded
• Structure: Rising stem, Non-rising stem
• Actuation: Manual, Pneumatic, Electric, Hydraulic
• Flow Direction: Bidirectional sealing capability

Pressure Ratings

• Nominal Pressure: PN6, PN10, PN16, PN25, PN40
• Working Pressure: 0.6-4.0 MPa (87-580 PSI)
• Test Pressure: Per API 598, ISO 5208, EN 12266 standards

Temperature Range

• Operating Temperature: -29°C to +232°C (-20°F to +450°F)
• Extended Temperature: Up to 400°C with special materials
• Media Temperature: Varies by seal and body material selection

Dimensional Data

• Face-to-Face: Per ASME B16.10, EN 558-1
• Flange Drilling: ASME B16.5, EN 1092-1, JIS B2220
• Weight: Approximately 45-85 kg (depending on materials and actuation)

Key Features

Advanced Design Benefits

• Precision Knife-Edge Gate: Hardened cutting edge shears through tough fibrous media
• Full Bore Design: Unobstructed flow passage ensures minimal pressure loss
• Bidirectional Service: Equal sealing performance in both flow directions
• Space-Efficient: Compact face-to-face dimensions for tight installations
• Self-Cleaning Action: Gate movement clears debris from sealing surfaces

Performance Advantages

• Superior Cutting Power: Handles paper pulp, textile fibers, and stringy materials
• Tight Shut-Off: Bubble-tight sealing per API 598 standards
• Low Operating Torque: Efficient design reduces actuator requirements
• Extended Service Life: Robust construction withstands abrasive conditions
• Easy Maintenance: Replaceable seats and packing for field serviceability

Material Specifications

Body Construction

• Cast Iron: ASTM A126 Class B, EN-GJL-250
• Ductile Iron: ASTM A395, EN-GJS-400-18-LT
• Carbon Steel: ASTM A216 WCB, A352 LCB (low temperature)
• Stainless Steel:
  • CF8 (304): General corrosion resistance
  • CF8M (316): Enhanced chemical resistance
  • CF3M (316L): Low carbon for welding applications
  • Duplex 2205: High strength and corrosion resistance

Gate Materials

• Stainless Steel: 304, 316, 316L, 17-4PH, Duplex 2205
• Tool Steel: Hardened for abrasive service
• Hastelloy: Extreme corrosion resistance
• Surface Treatments: Hard chrome plating, ceramic coating, stellite facing

Sealing Components

• Elastomeric Seals:
  • NBR (Buna-N): -40°C to +120°C, oil/water service
  • EPDM: -45°C to +150°C, steam/ozone resistance
  • Viton (FKM): -15°C to +200°C, chemical resistance
  • HNBR: Enhanced temperature and chemical resistance
• Metal Seats: Stainless steel, Stellite for high-temperature service
• PTFE: Chemical inertness, -200°C to +260°C

Applications & Industries

Primary Applications

• Pulp & Paper Industry:
  • Stock preparation systems
  • Bleaching plant operations
  • White water and filtrate handling
  • Broke and reject processing
• Water & Wastewater Treatment:
  • Primary and secondary sludge handling
  • Scum and grit removal systems
  • Digester feed and withdrawal
  • Polymer and chemical feed systems
• Mining & Minerals:
  • Ore slurry transport
  • Tailings pond operations
  • Concentrate thickening
  • Flotation cell isolation
• Food & Beverage:
  • Fruit and vegetable processing
  • Sugar refining operations
  • Brewery and distillery applications
  • Dairy processing systems
• Chemical & Petrochemical:
  • Catalyst slurry handling
  • Polymer and resin processing
  • Crystallizer operations
  • Reactor isolation

Service Media

• Paper pulp and stock (up to 6% consistency)
• Municipal and industrial sludge
• Mining slurries and tailings
• Food products and by-products
• Chemical slurries and suspensions
• Abrasive and erosive media

Design & Manufacturing Standards

International Standards Compliance

• Design Standards: API 6A, ASME B16.34, EN 19434
• Testing Standards: API 598, ISO 5208, EN 12266-1
• Face-to-Face Dimensions: ASME B16.10, EN 558-1, ISO 5752
• Flange Standards: ASME B16.5, EN 1092-1, JIS B2220
• Material Standards: ASTM, EN, JIS specifications

Quality Certifications

• ISO 9001:2015 Quality Management System
• ISO 14001:2015 Environmental Management
• OHSAS 18001 Occupational Health & Safety
• CE Marking (PED 2014/68/EU where applicable)
• API 6A PSL 1-4 Certification
• SIL 2/3 Functional Safety (actuated versions)

Installation & Maintenance

Installation Guidelines

• Pre-Installation Inspection:
  • Verify valve specification against P&ID requirements
  • Check for shipping damage and foreign material
  • Confirm proper storage and handling procedures
• Installation Best Practices:
  • Install with valve in closed position
  • Ensure pipeline is properly supported
  • Verify flange bolt torque values
  • Maintain minimum clearances for operation
  • Consider thermal expansion effects

Maintenance Procedures

• Routine Maintenance:
  • Monthly operation cycling (if feasible)
  • Quarterly packing adjustment if needed
  • Semi-annual complete functional testing
  • Annual internal inspection (where possible)
• Preventive Maintenance:
  • Seat and gate wear monitoring
  • Actuator lubrication and calibration
  • Stem packing replacement schedule
  • Bolting torque verification

Actuator Options

Manual Operation

• Handwheel: Standard 20-24 inch diameter for DN150
• Chainwheel: For elevated installations
• Lever: Quick quarter-turn operation where applicable
• Gearbox: Reduction gearing for high-pressure applications

Automated Actuation

• Pneumatic Actuators:
  • Spring return (fail-safe operation)
  • Double acting (precise positioning)
  • Scotch yoke or rack & pinion design
  • Stainless steel construction available
• Electric Actuators:
  • Multi-turn design for gate valves
  • Integral or remote control options
  • Position feedback and diagnostics
  • Explosion-proof ratings available
• Hydraulic Actuators:
  • High force capability
  • Precise position control
  • Fast operation speeds
  • Suitable for remote locations

Ordering Information

Complete Model Designation

DN150-KGV-[Pressure]-[Body Material]-[Gate Material]-[Seat Material]-[Actuation]-[Connection]

Example: DN150-KGV-PN16-CF8M-316L-EPDM-PNEU-RF150

Required Specifications

• Service Conditions:
  • Media type and concentration
  • Operating temperature and pressure
  • Flow rates and velocities
  • Cycling frequency requirements
• Material Requirements:
  • Body and bonnet materials
  • Internal trim specifications
  • Seat and seal materials
  • Special coatings or treatments
• Actuation & Accessories:
  • Manual or automated operation
  • Control signal requirements (4-20mA, digital, etc.)
  • Position indication needs
  • Emergency operation requirements

Factory Options

• Pneumatic or electric actuation packages
• Position transmitters and limit switches
• Special testing and inspection
• Custom materials and coatings
• Extended warranties and service contracts

Quality Assurance & Testing

Standard Factory Testing

• Hydrostatic shell test: 1.5 × working pressure
• Seat leakage test per API 598 (Class IV-VI available)
• Operational torque verification
• Dimensional and visual inspection
• Material certification review

Enhanced Testing Options

• Witnessed testing by third-party inspectors
• Extended duration testing
• Special media compatibility testing
• Accelerated life cycle testing
• Custom test procedures per customer specifications

Documentation Package

• Material test certificates per EN 10204 3.1/3.2
• Dimensional inspection reports
• Test certificates and data sheets
• Operation and maintenance manuals
• Spare parts recommendations
• Warranty certificates

Engineering Support: Our technical team provides comprehensive application engineering, custom design solutions, and ongoing technical support throughout the valve lifecycle.

Global Service Network: Factory-trained service technicians, genuine spare parts inventory, and emergency support services available worldwide.

For technical consultation, detailed quotations, or application-specific information, contact our engineering sales team.