DN1000 Bidirectional Knife Gate Valve

When your ultra-large diameter pipeline requires reliable bidirectional sealing and optimal flow control, the DN1000 bidirectional knife gate valve delivers exceptional performance and operational flexibility. This robust DN1000 bidirectional knife gate valve is engineered for large-scale applications demanding reliable shutoff in both flow directions — whether you’re managing water treatment facilities, industrial cooling systems, or process pipelines where flow reversal and tight sealing are essential. The advanced bidirectional sealing design ensures positive shutoff regardless of flow direction, while maintaining the superior cutting action of our proven large-diameter knife gate technology. With dual sealing capability and heavy-duty construction, it provides dependable service in demanding large-pipeline applications where operational versatility is critical.

Ready to achieve reliable bidirectional control in your DN1000 pipeline systems? Contact us today for a DN1000 bidirectional solution engineered for your specific flow requirements. Let TOT Valve secure your operations with proven large-valve reliability.

The TOT Valve You Can Depend On – DN1000 Bidirectional Excellence When Ultra-Large-Scale Versatility Matters

When your ultra-large-diameter process requires reliable sealing regardless of flow direction, operational flexibility, or emergency isolation capability from either side, you need the superior versatility of our DN1000 bidirectional knife gate valve. With advanced dual-direction sealing technology, this large knife gate valve provides reliable shutoff from both directions, exceptional flow characteristics, and outstanding durability — all while maintaining the reliable cutting action that makes knife gates ideal for challenging ultra-large-pipeline media.

The bidirectional design provides flexible flow control and consistent sealing performance throughout the valve’s service life, making it the preferred choice for ultra-large-scale water treatment, industrial process, and infrastructure applications.

Why DN1000 Bidirectional Knife Gate Valve Works for You?

DN1000 bidirectional knife gate valve features

Dual-direction sealing provides reliable shutoff regardless of upstream/downstream pressure configuration
Optimized DN1000 design with specialized engineering for 1000mm ultra-large-diameter applications
High flow capacity handles up to 27,000 m³/h with minimal pressure loss
Flow reversibility accommodates changing process directions without valve repositioning
Symmetrical seat configuration ensures equal sealing performance in both flow directions
Corrosion-resistant construction with stainless steel components for extended service life
Knife-edge gate efficiently cuts through large debris, settled materials, and fibrous media
Multiple actuation compatibility supports manual, pneumatic, electric, and hydraulic operation
Pressure equalization design prevents pressure lock and ensures smooth ultra-large-valve operation
Heavy-duty stem assembly withstands high thrust loads typical in DN1000 applications
Emergency isolation capability for rapid pipeline shutoff from either direction

DN1000 Bidirectional Knife Gate Valve Main Technical Specifications

Ultra-Large-Diameter Performance, Bidirectional Technology, DN1000 Knife Gate Valve

Specification	Details
Valve Size	DN1000 (NPS 40″)
Design Standard	MSS SP-81, AWWA C515, EN 593
Pressure Ratings	PN6, PN10, PN16
Maximum Flow Rate	27,000 m³/h at 9.5 m/s velocity

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

Standard	Face-to-Face	Flange Type	Weight Range
MSS SP-81	115mm	ANSI B16.5	850-1500 kg
AWWA C515	127mm	AWWA C207	920-1620 kg
EN 593	115mm	EN 1092-2	880-1550 kg

DN1000 Dimensional Specifications & Materials

Component	Material	Dimension	Standard
Body	WCB/CF8M	Ø1000mm bore	ASTM A216
Gate	316L SS	12mm thickness	ASTM A240
Flange	WCB/CF8M	Per rating	ASME B16.5
Stem	316L SS	Ø80-100mm	ASTM A276

Bidirectional Sealing Performance

Flow Direction	Sealing Class	Test Pressure	Leakage Rate
Upstream Seal	Class VI	6-16 Bar	≤0.1 ml/min/inch
Downstream Seal	Class VI	6-16 Bar	≤0.1 ml/min/inch
Bidirectional	Class VI	6-16 Bar	≤0.1 ml/min/inch

Actuation Options for DN1000 Service

Manual Operation:

Parameter	Value	Unit	Notes
Gear Ratio	50:1	–	Recommended
Operating Torque	8,500	Nm	At rated pressure
Handwheel Size	750	mm	Standard
Operating Force	1,200	N	Rim force

Pneumatic Operation:

Parameter	Value	Unit	Notes
Actuator Size	Ø500	mm	Cylinder diameter
Air Pressure	6-7	Bar	Supply requirement
Operating Time	90-180	sec	Variable speed
Air Consumption	280	L/cycle	Per operation

Electric Operation:

Parameter	Value	Unit	Notes
Motor Power	7.5-11	kW	Variable speed
Operating Time	240-480	sec	Programmable
Control Accuracy	±0.2	%	Position feedback
Power Consumption	25-35	A	At 380VAC

Hydraulic Operation:

Parameter	Value	Unit	Notes
Cylinder Force	600-1000	kN	Output force
System Pressure	140-210	Bar	Operating range
Cycle Time	60-240	sec	Variable control
Flow Requirement	150-250	L/min	Hydraulic flow

Advanced Bidirectional Technology

Symmetrical Design: Equal performance characteristics in both flow directions

Pressure Balance: Gate design minimizes differential pressure effects on operation

Flow Optimization: Streamlined internal geometry maximizes flow coefficient

Debris Management: Large gate opening accommodates substantial debris passage

Thermal Compensation: Design accounts for thermal expansion in ultra-large-diameter service

Vibration Resistance: Heavy-duty construction minimizes flow-induced vibration

Application-Specific Configurations

Water Treatment Plants:

Feature	Specification	Benefit	Standard
Seat Material	EPDM	Potable water safe	NSF-61
Body Material	CF8M	Corrosion resistance	ASTM A351
Actuation	Electric	Remote control	IEC 60034
Coating	Fusion Bond Epoxy	Long-term protection	AWWA C550

Industrial Process:

Feature	Specification	Benefit	Standard
Seat Material	Viton/PTFE	Chemical resistance	ASTM D2000
Body Material	Duplex 2205	High strength	ASTM A890
Actuation	Pneumatic	Fast response	ISO 5599
Design	Fire-safe	Emergency safety	API 607

Performance Testing & Validation

Flow Testing:

Test Type	Standard	Parameter	Acceptance
Cv Verification	ISA-75	Flow coefficient	±5% of calculated
Pressure Loss	ISO 5167	ΔP measurement	≤0.4 Bar @ rated flow
Cavitation	IEC 60534	Sigma limits	Per application

Sealing Testing:

Direction	Standard	Pressure	Leakage Limit
Forward	MSS SP-81	1.1 × rated	Class VI
Reverse	MSS SP-81	1.1 × rated	Class VI
Cycling	API 598	100 cycles	No degradation

Installation & Engineering Services

Pre-Installation Services:

Site Survey: Pipeline analysis and installation planning
Foundation Design: Structural requirements and anchor bolt layouts
Thermal Analysis: Expansion joint requirements and pipe stress analysis
Flow Analysis: CFD modeling for optimal valve positioning

Installation Support:

Rigging Plans: Certified lifting procedures for heavy valve assemblies
Alignment Services: Precision alignment for optimal performance
Testing Protocols: Complete commissioning and performance verification
Documentation: As-built drawings and performance certificates

Maintenance & Service Support

Predictive Maintenance:

Component	Monitoring	Frequency	Action
Seat Wear	Torque trending	Monthly	Replace at limit
Stem Condition	Visual inspection	Quarterly	Lubricate/adjust
Actuator	Performance data	Continuous	Trend analysis
Body Integrity	NDT inspection	Annual	Report findings

Service Capabilities:

Field Service: On-site maintenance and repair capabilities
Refurbishment: Complete valve restoration to original specifications
Upgrades: Actuator and control system modernization
Training: Comprehensive maintenance training programs

Quality Certifications & Compliance

Manufacturing Standards:

ISO 9001:2015 Quality Management System certification
ISO 14001 Environmental Management System compliance
OHSAS 18001 Occupational Health and Safety certification
PED 2014/68/EU Pressure Equipment Directive compliance

Performance Standards:

MSS SP-81 Knife Gate Valve Standard compliance
AWWA C515 Large Diameter Valve Standard
EN 12266-1 Industrial Valve Testing Standard
API 598 Valve Inspection and Testing Standard

Contact TOT Valve today for technical consultation and competitive quotation on your DN1000 bidirectional knife gate valve requirements for ultra-large-diameter pipeline applications.