DN700 Unidirectional Knife Gate Valve

When your large-diameter pipeline requires optimized unidirectional flow control and maximum sealing efficiency, the DN700 unidirectional knife gate valve delivers exceptional performance and cost-effective operation. This heavy-duty DN700 unidirectional knife gate valve is engineered for large-scale applications with defined flow direction — whether you’re managing gravity flow systems, discharge pipelines, or process applications where flow direction is fixed and optimal sealing performance is critical. The streamlined unidirectional design ensures maximum sealing efficiency and reduced operating torque, while maintaining the superior cutting action of our proven large-diameter knife gate technology. With optimized single-direction sealing and robust construction, it provides dependable service in demanding large-pipeline applications where directional flow control is paramount.

Ready to achieve optimized unidirectional control in your DN700 pipeline systems? Contact us today for a DN700 unidirectional solution engineered for your specific flow requirements. Let TOT Valve optimize your operations with proven directional reliability.

The TOT Valve You Can Depend On – DN700 Unidirectional Optimization When Directional Flow Control Maximizes Performance

When your large-diameter process operates with consistent flow direction and requires maximum sealing efficiency, cost optimization, or simplified maintenance procedures, you need the superior performance of our DN700 unidirectional knife gate valve. With optimized single-direction sealing technology, this large knife gate valve provides enhanced sealing performance, reduced operating forces, and outstanding reliability — all while maintaining the reliable cutting action that makes knife gates ideal for challenging large-pipeline media.

The unidirectional design provides optimized flow control and maximum sealing efficiency throughout the valve’s service life, making it the preferred choice for large-scale municipal, industrial, and process applications with defined flow patterns.

Why DN700 Unidirectional Knife Gate Valve Works for You?

DN700 unidirectional knife gate valve features

Optimized unidirectional sealing provides enhanced shutoff performance in designated flow direction
DN700 specialized design with expert engineering for 700mm large-diameter applications
High flow capacity handles up to 13,500 m³/h with optimized pressure characteristics
Reduced operating torque through asymmetrical design optimized for single flow direction
Enhanced seat design maximizes sealing efficiency and extends service life
Corrosion-resistant construction with premium stainless steel components
Knife-edge gate efficiently cuts through large debris, settled solids, and fibrous materials
Cost-optimized design reduces material and manufacturing costs compared to bidirectional valves
Simplified maintenance with single-direction seat configuration for easier service
Heavy-duty stem design engineered for high thrust loads in large-diameter service
Flow direction indication clear marking prevents incorrect installation orientation

DN700 Unidirectional Knife Gate Valve Main Technical Specifications

Large-Diameter Excellence, Unidirectional Technology, DN700 Knife Gate Valve

Specification	Details
Valve Size	DN700 (NPS 28″)
Design Standard	MSS SP-81, AWWA C515, EN 593
Pressure Ratings	PN6, PN10, PN16
Maximum Flow Rate	13,500 m³/h at 7.0 m/s velocity

Pressure Rating	Working Pressure	Test Pressure	Max Velocity
PN6	6 Bar	9 Bar	2.0 m/s
PN10	10 Bar	15 Bar	2.5 m/s
PN16	16 Bar	24 Bar	3.0 m/s

Standard	Face-to-Face	Flange Type	Weight Range
MSS SP-81	105mm	ANSI B16.5	380-720 kg
AWWA C515	117mm	AWWA C207	410-750 kg
EN 593	105mm	EN 1092-2	390-730 kg

DN700 Component Materials & Construction

Component	Standard Grade	Premium Grade	Special Service
Body	WCB	CF8M	Duplex 2205
Gate	304SS	316L	Duplex 2205
Seat	EPDM	Viton	Metal-to-Metal
Stem	2Cr13	316L	Duplex 2205

Unidirectional Flow Optimization

Streamlined Design: Flow-optimized internal geometry reduces pressure drop by 15-25%

Enhanced Cv Value: Unidirectional design achieves higher flow coefficients than bidirectional valves

Reduced Turbulence: Asymmetrical internal profile minimizes flow disturbance

Debris Management: Optimized gate profile directs debris away from sealing surfaces

Pressure Recovery: Enhanced downstream pressure recovery characteristics

Cavitation Resistance: Flow-optimized design reduces cavitation potential

DN700 Performance & Flow Data

Flow Rate (m³/h)	Velocity (m/s)	Pressure Drop	Cv Value
2,700	2.0	0.08 Bar	45,000
4,050	3.0	0.18 Bar	45,000
5,400	4.0	0.32 Bar	45,000
6,750	5.0	0.50 Bar	45,000

Actuation Systems for DN700 Applications

Manual Actuation:

Component	Specification	Performance	Standard
Gear Box	40:1 Ratio	3,500 Nm output	ISO 5211
Handwheel	Ø550mm	800N rim force	EN 12516
Override	Manual backup	Emergency operation	MSS SP-81

Pneumatic Actuation:

Component	Specification	Performance	Standard
Cylinder	Ø350mm bore	60-120 sec cycle	ISO 5599
Air Supply	6-7 Bar	120 L/cycle	ISO 8573
Control	Fail-safe options	Spring return	NAMUR

Electric Actuation:

Component	Specification	Performance	Standard
Motor	3.0-4.0 kW	180-360 sec cycle	IEC 60034
Control	Variable speed	±0.2% accuracy	IEC 60534
Protection	IP67/NEMA 4X	Harsh environment	IEC 60529

Hydraulic Actuation:

Component	Specification	Performance	Standard
Cylinder	250-400 kN	45-180 sec cycle	ISO 4413
Pressure	140-210 Bar	Variable speed	NFPA
Remote	Up to 500m	Control distance	ISO 4413

Application Engineering & Selection

Municipal Water Systems:

Flow Direction: Typically gravity feed or pump discharge
Pressure Rating: PN10 standard for municipal applications
Seat Material: EPDM for potable water compliance
Actuation: Electric for SCADA integration and remote control

Industrial Process:

Flow Direction: Process-defined with consistent direction
Pressure Rating: PN16 for higher system pressures
Seat Material: Viton/PTFE for chemical compatibility
Actuation: Pneumatic for rapid response and fail-safe operation

Power Generation:

Flow Direction: Cooling water discharge and feed applications
Pressure Rating: PN6-10 based on system design
Seat Material: Metal seats for high-temperature service
Actuation: Electric with emergency backup for safety systems

Installation Orientation & Requirements

Orientation	Recommended Use	Special Considerations	Support Requirements
Horizontal	Standard installation	Flow arrow alignment	Standard pipe support
Vertical	Space constraints	Gate weight support	Enhanced stem support
Inclined	Following pipeline	Angle limitations ±45°	Calculated support loads

Quality Testing & Performance Validation

Pressure Testing:

Test Type	Pressure	Duration	Acceptance
Shell Test	15-24 Bar	15 minutes	No leakage
Seat Test	6.6-17.6 Bar	15 minutes	Class VI limit
Backpressure	1.1 × rated	5 minutes	No seat damage

Performance Verification:

Parameter	Test Method	Standard	Tolerance
Operating Torque	Calibrated wrench	MSS SP-81	±10%
Flow Coefficient	Flow loop test	ISA-75	±5%
Seal Integrity	Pressure decay	API 598	Class VI

Engineering Support & Documentation

Technical Services:

Application Engineering: Flow analysis and valve sizing optimization
Installation Support: Complete installation drawings and procedures
Commissioning: Expert startup services and performance verification
Training: Comprehensive operator and maintenance training programs

Documentation Package:

General Assembly Drawing with complete bill of materials
Installation Manual with step-by-step procedures
Operation Manual with safety and performance guidelines
Maintenance Manual with scheduled service procedures

Cost Optimization & Value Engineering

Unidirectional Advantages:

Material Savings: 15-20% cost reduction compared to bidirectional design
Simplified Manufacturing: Reduced machining and assembly time
Enhanced Performance: Optimized for single flow direction efficiency
Maintenance Benefits: Simplified seat replacement and service procedures

Lifecycle Cost Analysis:

Lower Initial Cost: Optimized design reduces manufacturing expense
Reduced Operating Costs: Lower torque requirements reduce energy consumption
Extended Service Life: Optimized loading extends component life
Simplified Maintenance: Single-direction design reduces service complexity

Environmental & Safety Features

Environmental Protection:

Feature	Standard	Benefit	Application
Fugitive Emissions	ISO 15848	Zero leakage	Environmental compliance
Material Selection	ROHS/REACH	Safe materials	European compliance
Coating Systems	ISO 12944	Corrosion protection	Extended service life

Safety Systems:

Flow Direction Marking: Clear directional indicators prevent misinstallation
Pressure Rating Labels: Visible pressure and temperature ratings
Lifting Points: Certified lifting lugs for safe handling
Emergency Operation: Manual override capability for all actuator types

Contact TOT Valve today for technical consultation and competitive quotation on your DN700 unidirectional knife gate valve requirements for optimized large-diameter pipeline applications.