Duplex Steel Knife Gate Valve
When your industrial fluid system handles highly corrosive, abrasive, or viscous media, you need valves that deliver both durability and reliable shut-off. Designed for harsh chemical, saline, and slurry environments, our duplex steel knife gate valves provide long-lasting performance and operational reliability.
TOT duplex steel knife gate valves feature a blade-shaped gate that moves perpendicular to the flow, engineered to control challenging media such as slurries, corrosive liquids, powders, and wastewater.
Duplex steel knife gate valves are defined by their sharp, blade-like gate capable of cutting through tough materials, ensuring tight shut-off even in the most demanding conditions.
Made from high-performance duplex stainless steel (2205/2507), these valves offer superior corrosion resistance, high strength, and excellent durability — ideal for aggressive chemical or saline media.
Full Duplex Steel Body & Gate: Every wetted and structural component is duplex steel, guaranteeing corrosion-proof performance.
Customizable for Your Flow System: Face-to-face dimensions, flanges, actuators — fully adapted to your project specifications.
Factory-Tested Before Delivery: Every valve undergoes hydrostatic and seat testing to ensure compliance with international standards.
API 6D, CE, and ISO Certified Manufacturing: Confidence backed by global-quality compliance and professional engineering.
Contact us today to enhance your pipeline reliability and minimize operational downtime.
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Duplex Steel Knife Gate Valve Data Sheet
| Parameter | Details |
|---|---|
| Body Material | Duplex Stainless Steel 2205 / 2507 |
| Gate Material | Duplex Stainless Steel 2205 / 2507 |
| Seat Options | EPDM, PTFE, Metal Seat |
| Packing | PTFE, Graphite, Braided Aramid |
| Pressure Rating | PN10 / PN16 / ANSI 150 |
| Face-to-Face | Customizable |
| Connection | Wafer / Lug / Flanged |
| Actuation | Manual, Pneumatic, Electric |
Material Comparison: Duplex Steel vs. Stainless Steel vs. Carbon Steel
| Feature | Duplex Steel | Stainless Steel | Carbon Steel |
|---|---|---|---|
| Corrosion Resistance | Excellent, especially against chlorides | Very good | Poor without coating |
| Abrasion Resistance | High | Moderate | Moderate |
| Strength | High (higher pressure tolerance) | Medium | Medium |
| Cost | Medium-High | Medium | Low |
| Weight | Medium | Medium | Medium |
| Ideal Media | Aggressive chemicals, seawater, slurry | Corrosive + semi-abrasive | Neutral + clean fluids |
| Common Applications | Chemical plants, seawater, pulp & paper | Food & beverage, wastewater | Water, oil, general purpose |
| Availability (Lead Time) | Medium (depends on size) | Fast | Fast |
Kind Tips: If your priority is high corrosion resistance, high strength, and handling abrasive or saline media — duplex steel is your top-performing choice.
Why Choose Duplex Steel Knife Gate Valves?
In environments where standard valves fail due to corrosion or clogging, duplex steel knife gate valves provide:
Superior Corrosion Resistance: Handles aggressive chemicals, seawater, and saline slurries.
High Strength & Reliability: Resists deformation under high pressure or abrasive media.
Low Maintenance: Self-cleaning gate design and durable construction reduce downtime.
Tough Media Handling: Slurries, powders, viscous fluids, and fibrous materials are easily cut and sealed.
How Our Duplex Steel Knife Gate Valves Are Built for Performance
Full Bore Flow: Unobstructed port ensures smooth media flow with minimal pressure drop.
Razor-Sharp Shut-Off: Blade gate slices through heavy or fibrous media for tight sealing.
Corrosion-Resistant Construction: Entire valve body and gate made of duplex steel — no rust, no flaking.
Multiple Actuation Options:
Manual (Handwheel / Chainwheel)
Pneumatic Cylinder
Electric Actuator
Resilient & Metal Seat Options: Bubble-tight EPDM/PTFE or rugged metal seats.
Zero Leakage to Atmosphere: Gland packing, O-rings, and scraper rings ensure full sealing.
Available Sizes & Pressure Ratings
Size Range: DN50–DN1200 (2″–48″)
Pressure Class: PN10 / ANSI 150 / custom available
Temperature Range: Up to 250°C depending on seat and packing
Applications You Can Trust It In
Chemical Processing: Handles aggressive media and corrosive fluids.
Seawater & Desalination: Excellent resistance to chloride-induced corrosion.
Pulp & Paper: Cuts fibrous slurry efficiently.
Wastewater Treatment: Handles sludge and debris.
Mining & Minerals: Resists abrasive slurries.
Power Plants: Controls ash and chemical-laden fluids.
Optional Features for Enhanced Performance
Purge Ports: Flush sticky media
Position Indicator: Remote operation feedback
Extended Stem / Gearbox: For deep or remote installations
Dust Covers & Scrapers: Prevent buildup on stem and sealing surfaces
* We are not just providing simple quotes but experts in selection, calculation, and drawing.
FAQ-Duplex Steel Knife Gate Valve
A valve designed to handle aggressive, corrosive, or abrasive fluids. It features a blade-shaped gate for reliable shut-off and is made of high-strength duplex stainless steel.
Slurries, powders, viscous fluids, fibrous materials, chemical and saline media.
The blade moves perpendicular to the flow, cutting through media for full bore flow and tight shut-off.
Yes — manual, pneumatic, and electric actuators are all available.
Select based on media type, pressure, temperature, and corrosion level. Our team can provide customized recommendations.
Minimal; routine inspection and cleaning of the gate and seat are recommended.
