The wafer-type knife gate valve is a specialized valve that uses a wafer-type installation structure (the valve body has no independent flange; it is directly clamped between two flanges on the pipeline using bolts). It is driven manually or by a drive device (such as pneumatic or electric) to vertically raise and lower the knife gate plate to achieve media interception. It is specifically designed for situations requiring limited space, ease of installation, and the transport of media containing particles (≤10mm in diameter), fibers, or high viscosity media (such as sewage, pulp, and slurry).
It solves the problems of large size and space occupation associated with flanged knife gate valves, while also featuring a compact structure, high installation efficiency, and unobstructed flow path to prevent blockage. It conforms to API 609 standards and is widely used in compact piping systems in municipal wastewater treatment, papermaking, mining, and chemical industries.
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wafer knife gate valve Technical parameters
| Type | Wafer Type Knife Gate Valve |
|---|---|
| Size | DN50-DN450 |
| Body | Carbon Steel, Cast Iron |
| Gasket | EPDM/ NBR/ VITON |
| Knife | SS304/ SS316 |
| Max. Pressure | PN10 |
| Max. Temperature | 60°C |
| Manual Control | Aluminum Handwheel |
| Pneumatic Control | Single-Acting, Double-Acting Actuator |
| Electric Actuator | 380V Multi-Turn Electric Actuator |
| Connection | Wafer |
| Applications | Fibrous Fluids, Wastewater, Hot Water, Cold Water, Fluids without Acidic and Alkaline Properties |
Structural Advantages of Wafer Knife Gate Valves:
1. Compact and Lightweight: The wafer-type knife gate valve features a wafer structure, making the entire valve more compact and lightweight, facilitating installation and maintenance.
2. Excellent Sealing Performance: The knife gate and valve seat utilize a metal-to-metal hard seal, ensuring excellent sealing performance and effectively preventing fluid leakage.
3. Wear and Corrosion Resistance: Key components such as the gate and valve seat are made of wear-resistant and corrosion-resistant materials, extending the service life of the gate valve.
Features of wafer-type knife gate valves:
- Compact structure, space-saving: The wafer-type connection results in a shorter valve length and requires less installation space, making it suitable for space-constrained applications.
- Lightweight and easy to install: Compared to flanged gate valves, wafer-type knife gate valves are lighter, reducing installation difficulty and maintenance costs.
- Strong shut-off capability: The knife-shaped valve plate has sharp edges that can cut through pulp, fibers, particles, etc., in the medium, effectively preventing blockage.
- Good flow capacity: When the valve is fully open, the medium can flow smoothly with minimal pressure drop.
- Reliable sealing performance: Employing elastic or metal seals ensures good sealing performance when the valve is closed.
Applications of Wafer-Type Knife Gate Valves
- Municipal Wastewater Treatment: Wastewater pipeline booster pump outlet, carbon steel wafer-type knife gate valve (DN150), conveying sludge containing impurities (particles ≤8mm). Wafer installation saves pump station space; manual opening and closing adapts to small to medium flow scenarios; prevents sludge backflow.
- Paper Industry: Pulp production line branch pipe, 304 stainless steel wafer-type knife gate valve (DN200), conveying pulp containing fibers. Fluororubber seals resist chemical additive corrosion; unobstructed flow path prevents fiber entanglement; pneumatic drive adapts to production line rhythm.
- Mining Industry: Mine tailings slurry conveying branch pipe, carbon steel wafer-type knife gate valve (DN125), conveying tailings slurry containing ore particles (≤10mm). Tungsten carbide knife gate plate resists erosion; wafer installation adapts to confined underground spaces.
- Food Processing: Jam filling line, 304 stainless steel sanitary wafer-type knife gate valve (DN80), PTFE. Sealing meets food standards; no dead-angle flow channels prevent sauce residue; manual opening and closing suitable for small-batch production.
- Chemical industry: Chemical slurry circulation branch pipe, 316L stainless steel wafer-type knife gate valve (DN100), for conveying acidic slurries (pH=2-5); corrosion-resistant material prevents erosion; wafer-type installation suitable for densely populated equipment areas; electric drive enables remote control.
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