What Is a Ceramic Knife Gate Valve?
A ceramic knife gate valve is a type of on-off valve specially designed for handling aggressive media such as slurry, fly ash, pulp, and chemical waste. Its core advantage lies in its ceramic-lined internals, which offer exceptional resistance to abrasion and corrosion—far superior to metal-seated alternatives.
Unlike traditional knife gate valves, our ceramic series uses advanced engineering ceramics (like alumina and zirconia) in the sealing surfaces, gate, and inner sleeves. This means:
- You get a longer service life in highly abrasive conditions.
- You reduce unplanned downtime due to valve failure.
- You enjoy tight shut-off, even under high solid content.
Whether you’re operating in mining, power plants, paper mills, or wastewater treatment, our ceramic knife gate valves are engineered to outperform and outlast.
If your process involves abrasive slurries, corrosive chemicals, or solid-laden fluids, conventional valves just don’t cut it. You need flow control that withstands extreme wear and delivers consistent performance.
Are you ready to upgrade to reliable ceramic knife gate valves? With TOT Ceramic Knife Gate Valves, you get durability, performance, and peace of mind—even in the harshest environments. Say goodbye to frequent downtime and costly repairs.
Contact us now, let us help you optimize your pipeline efficiency and reduce operational downtime today.
Be careful when choosing a new valve supplier, the disappointment of poor quality can last much longer than the joy of a low price!
Why Choose TOT Ceramic Knife Gate Valves?
At TOT Valve, we don’t just manufacture valves—we engineer long-term flow control solutions. Here’s how you benefit when you choose our ceramic knife gate valve lineup:
- ✔ Unmatched Wear Resistance: Our valves are lined with 95% alumina or zirconia ceramics that offer 8–10 times the wear resistance of stainless steel. This means less erosion, less maintenance, and fewer replacements.
- ✔ Chemical and Corrosion Proof: Ceramic components resist chemical attack from acids, alkalis, and aggressive slurries, making them ideal for harsh process environments.
- ✔ Leak-Free Shut-Off: Ceramic-to-ceramic or metal-to-ceramic sealing ensures bubble-tight isolation, even under fluctuating pressures and abrasive media.
- ✔ Fully Customizable to Your Application: From unidirectional or bidirectional flow designs to custom port sizes, end connections, and stem types, our ceramic valves can be tailored for your exact process.
- ✔ Reduced Total Cost of Ownership: While the upfront cost of a ceramic valve is higher than a standard metal valve, its extended service life and reduced downtime make it a smart investment for cost-conscious operations.
Applications of Ceramic Knife Gate Valves
TOT ceramic knife gate valves are trusted by clients worldwide in:
- Power Plants – for fly ash handling, bottom ash discharge, and FGD slurry
- Mining and Mineral Processing – tailings, concentrate pipelines, thickener underflows
- Pulp & Paper Mills – pulp flow isolation and chemical dosing
- Steel and Metallurgy – blast furnace slag slurry, ore slurry
- Wastewater Treatment – high solid content sludge isolation
Technical Features & Ceramic Structure Advantages
When durability and performance matter, materials and design make all the difference. Our ceramic knife gate valves are engineered with precision and built for reliability.
| Component | Description |
| Body Material | Carbon Steel (WCB), Stainless Steel (CF8/CF8M), lined with ceramic |
| Ceramic Options | 95% Al₂O₃, ZrO₂ (zirconia), Si₃N₄ (silicon nitride) |
| Gate Design | Hardened stainless steel, ceramic-coated, or solid ceramic |
| Seat Type | Replaceable ceramic seat or integrated ceramic lining |
| Sealing Method | Ceramic-to-ceramic / metal-to-ceramic / resilient seal (optional O-ring backup) |
| Stem Options | Rising or non-rising stem |
| End Connections | Flanged (ASME/DIN), wafer type, lug type |
| Size Range | DN50 to DN600 (2” to 24”) |
| Pressure Rating | Class 150 / PN10–PN25 / customized available |
| Temperature Range | Up to 250°C (depending on ceramic type) |
Add-on Features: Pneumatic, electric, and manual actuation available. Options for purge ports, deflector cones, and reinforced sealing rings.
Product Series & Selection Guide
We offer a complete range of ceramic knife gate valves for diverse flow conditions:
- Unidirectional Ceramic Knife Gate Valve: Best for single-flow applications like bottom ash discharge or thickener underflow.
- Bidirectional Ceramic Knife Gate Valve: Ideal for reversing flow systems or where back pressure may occur.
- Wafer Type Ceramic Knife Gate Valve: Space-saving design for compact installations. Easy to install and replace.
- Full Bore / Through-Port Ceramic Knife Gate Valve: Prevents sediment buildup by allowing unrestricted media passage.
Use our quick reference guide to choose the right valve:
| Flow Media | Pressure | Abrasion | Recommended Type |
| Fly Ash Slurry | High | Very High | Bidirectional with ZrO₂ trim |
| Pulp & Paper | Medium | Medium | Unidirectional Al₂O₃ ceramic |
| Mining Slurry | High | Severe | Full-port, ZrO₂ ceramic |
| Chemical Waste | Low | Corrosive | Wafer type with Si₃N₄ coating |
Inside Our Ceramic Valve Technology
TOT’s ceramic valve technology is developed in-house and refined over 15+ years of industry experience.
Precision Manufacturing: All ceramic parts are isostatically pressed, sintered at high temperature, and precisely machined to tight tolerances.
High-Purity Ceramics: We use only technical-grade ceramics with exceptional mechanical and thermal properties.
Rigorous Testing: Each valve undergoes hydrostatic pressure testing and shut-off performance evaluation before shipment.
Modular Design Philosophy: Easier maintenance, lower inventory costs, and shorter lead times.
You don’t just buy a valve—you invest in engineered flow control that lasts.
Certifications & Quality Assurance
TOT Valve is ISO 9001-certified and operates under strict QA protocols:
- 100% pressure-tested before shipment
- Traceable material certificates
- Custom inspection reports (upon request)
- API 6D compliance available for select models
All our valves are built to ensure long service life and operator safety in critical environments.
* We are not just providing simple quotes but experts in selection, calculation, and drawing.
FAQ
Ceramic knife gate valves offer exceptional resistance to abrasion and corrosion, making them ideal for handling slurries, fly ash, and aggressive chemicals. Compared to metal valves, ceramic-lined valves can last up to 5–10 times longer, reducing maintenance frequency and total lifecycle costs.
Yes. TOT offers both unidirectional and bidirectional ceramic knife gate valves. Bidirectional models are designed to withstand pressure from both flow directions, making them ideal for pump discharge, slurry loops, or reversing pipelines.
Alumina (Al₂O₃): is more economical and suitable for most abrasive slurries.
Zirconia (ZrO₂): offers superior toughness and is recommended for high-pressure, high-impact applications.
Our team will guide you based on your media, temperature, and pressure conditions.
We offer various actuation options including:
- Manual handwheel or gear
- Pneumatic cylinder
- Electric actuator
All actuator types can be customized to fit your automation requirements and control system.
Absolutely. Our full-port and through-channel designs allow for unrestricted flow, minimizing clogging even in >30% solid content slurries. This makes them ideal for mining tailings, thickener discharge, and ash handling.
