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Knife gate valves are industrial valves designed specifically to handle slurries, powders, and other viscous or abrasive media. They are commonly used in industries such as mining, wastewater treatment, pulp and paper, and chemical processing. The combination of materials used in knife gate valves is critical to their performance, durability, and suitability for a particular application.
1. Body Materials
The valve body is the primary structural component that houses the gate and seal. Common materials include:
- Carbon Steel:
- Durable and cost-effective.
- Suitable for general use.
- Often coated or lined for corrosion protection.
- Stainless Steel:
- Excellent corrosion resistance.
- Ideal for harsh environments such as chemical processing or marine applications.
- Grades such as 304 and 316 are commonly used.
- Ductile Iron:
- Strong and impact-resistant.
- Commonly used in water and wastewater applications.
- Can be coated with epoxy or other materials for added protection.
- Alloy Steel:
- High strength and wear resistance.
- For high pressure or high temperature applications.
2. Gate Materials
The gate is the moving part that cuts the media to open or close the valve. It must be strong, wear-resistant, and corrosion-resistant.
- Carbon steel:
- For less corrosive environments.
- Often hardened or coated for increased wear resistance.
- Hardened steel:
- Heat treated for increased hardness and durability.
- Suitable for abrasive media such as slurries.
3. Coating Materials
Coatings are applied to valve components to improve performance and life.
- Epoxy coating:
- Provides corrosion resistance and a smooth surface.
- Commonly used in water and wastewater applications.
- Hard coating:
- Made of materials such as tungsten carbide or chromium carbide for wear resistance.
- Ideal for abrasive media.
