DN1000 Bi-Directional Rising Stem Wafer Manual Handwheel Knife Gate Valve
The DN1000 (40 Inch) Bi-Directional Knife Gate Valve represents the pinnacle of large-bore slurry and bulk material isolation. Engineered for critical applications where process safety demands zero-leakage shutoff regardless of pressure direction, this valve provides supreme reliability and versatility.
Utilizing a robust Bi-Directional Sealing System, it is ideal for pipelines where flow reversal is possible or where pump isolation must be guaranteed from both the upstream and downstream side. Its Wafer design ensures a minimized footprint, while the Manual Handwheel with a Rising Stem offers safe, direct operation and clear position feedback.
The DN1000 Bi-Directional Wafer Knife Gate Valve is a large-diameter isolation valve designed to provide tight shut-off in both flow directions. Unlike uni-directional valves, it ensures reliable sealing regardless of pressure side, making it an ideal solution for systems with variable or reverse flow conditions.
With a wafer-style body, rising stem design, and optional actuation methods, this valve combines compact installation with robust performance. It is widely used in wastewater treatment, mining slurry pipelines, power plants, and other industries handling abrasive or solids-laden media.
Key Features
Bi-Directional Sealing – Ensures bubble-tight shut-off from either pressure side.
Wafer Connection – Compact and lightweight, easy to install between flanges.
Large-Diameter Reliability – Specifically engineered for DN1000 pipelines with heavy-duty body and gate.
Rising Stem Design – Provides clear and visible valve position indication.
Flexible Actuation Options – Manual handwheel as standard; bevel gear, electric, or pneumatic actuators available for easier operation.
Enhanced Seat Protection – Designed to minimize wear and extend service life in abrasive media.
Technical Specifications
Size: DN1000
Connection Type: Wafer (sandwiched between flanges)
Sealing Type: Bi-directional
Stem Design: Rising stem
Actuation: Manual handwheel (standard); Bevel Gear / Electric / Pneumatic (optional)
Body Material Options: Cast iron, ductile iron, carbon steel, stainless steel (304/316), duplex steel
Seat Options: Resilient seat (EPDM, NBR, Viton) or metal-to-metal for high temperature service
Pressure Rating: Available in standard industrial classes (customizable)
Typical Applications
The DN1000 Bi-Directional Wafer Knife Gate Valve is suitable for industries that require reliable isolation under fluctuating flow directions:
Wastewater Treatment – Sludge, sewage, and mixed flow channels.
Mining Industry – Tailings transport, thick slurries, and abrasive flows.
Power Plants – Flue gas desulfurization (FGD), ash handling, and slurry transport systems.
Pulp & Paper – Fiber stock and high-consistency pulp where reverse flow may occur.
Why Choose TOT Valve?
At TOT Valve, we manufacture high-performance knife gate valves tailored to your industry needs. The DN1000 Bi-Directional Wafer Knife Gate Valve combines reliability, heavy-duty construction, and flexible actuation options to meet demanding flow control challenges.
Need automated operation for this massive valve? We offer customized automation packages, including high-torque Gearboxes, high-thrust Pneumatic Cylinders, and precision Electric Actuators, built to handle the high cycling force of the DN1000 size. Contact our engineering team for actuation solutions.
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