A sewer knife gate valve is a specialized valve designed for wastewater, sewage, and sludge handling systems.
Unlike conventional gate valves, it uses a sharp-edged stainless-steel blade (knife) that can cut through solids, debris, and viscous media, ensuring smooth and reliable shut-off even in challenging sewer applications.
These valves are widely used in municipal wastewater treatment plants, industrial sewage systems, and drainage pipelines, where media often contain fibrous or solid particles.
⚙️ Working Principle
The knife gate valve operates by moving a flat, sharpened gate vertically through the flow path.
When the valve is opened, the gate lifts completely out of the flow, allowing unrestricted passage of sewage or slurry.
When it closes, the knife edge cuts through suspended solids and presses tightly against the seat to achieve a leak-tight seal.
For sewer systems, this simple linear motion design ensures low-pressure drop, minimal clogging, and easy maintenance.
🔩 Key Features and Benefits
| Feature | Description |
|---|---|
| Full Bore Flow Design | Prevents clogging and ensures free passage of solids and sludge. |
| Knife-Edge Gate | Cuts through fibrous or solid materials in wastewater. |
| Corrosion-Resistant Materials | Stainless steel knife and epoxy-coated body resist chemical and biological corrosion. |
| Bi-Directional Sealing | Provides tight shut-off from both directions. |
| Easy Maintenance | Simple design allows quick cleaning and seal replacement. |
| Actuation Options | Manual handwheel, pneumatic cylinder, or electric actuator. |
🧱 Applications
Sewer knife gate valves are commonly used in:
🏭 Wastewater Treatment Plants – Isolation and control of sludge, scum, and effluent.
🌆 Municipal Sewer Systems – Control of raw sewage and drainage lines.
🧪 Industrial Effluent Treatment – Handling corrosive or abrasive fluids in chemical and food industries.
⚙️ Pulp & Paper Mills – Control of pulp slurry and fiber-laden liquids.
⛽ Mining and Power Plants – Slurry, ash, and tailings transport systems.
⚙️ Technical Specifications
| Parameter | Details |
|---|---|
| Size Range | DN50 – DN1200 (2” – 48”) |
| Pressure Rating | PN10 / PN16 / Class 125 |
| Body Material | Ductile Iron, Cast Iron, Stainless Steel |
| Gate Material | Stainless Steel AISI 304 / 316 |
| Seat Material | EPDM / NBR / PTFE |
| Stem Material | Stainless Steel |
| Operation | Handwheel, Gearbox, Pneumatic, or Electric Actuator |
| End Connection | Wafer Type / Lug Type / Flanged |
| Coating | Fusion-Bonded Epoxy (Blue or Red) |
| Standard Compliance | MSS SP-81 / EN 593 / AWWA C520 |
🧰 Advantages of Sewer Knife Gate Valves
Non-Clogging Design ideal for slurry and sewage systems
Lightweight and Compact – easy to install and maintain
Cost-Effective Solution for large-diameter low-pressure systems
Long Service Life due to corrosion-resistant materials
Customizable Operation – manual, pneumatic, or automated
🧩 Types of Sewer Knife Gate Valves
Wafer-Type Knife Gate Valve – Compact design for limited space installations.
Lug-Type Knife Gate Valve – Suitable for end-of-line service and isolation.
Flanged Knife Gate Valve – Heavy-duty, high-integrity sealing for municipal systems.
Pneumatic Knife Gate Valve – Automated operation for remote control in treatment plants.
🌍 Why Choose TOT Valve Solutions
TOT Valve Solutions supplies a wide range of knife gate valves for wastewater and sewage applications, manufactured according to international standards (MSS SP-81, EN, AWWA).
Our valves ensure leak-tight performance, corrosion resistance, and smooth operation in even the most demanding sewer environments.
📞 Contact Us
Looking for a durable and cost-effective sewer knife gate valve for your wastewater system?
TOT Valve Solutions offers customized designs, OEM production, and global supply to meet municipal and industrial needs.
👉 Contact us today to request datasheets, quotes, or technical support for your next project.
