Valves for Slurry — Abrasive Pulp / Mineral Slurry Service
Slurry service involves suspensions of abrasive solids in liquid (typically water). Common in mining, cement, power plant ash handling, and dredging. Abrasive wear on valve internals is the primary failure mode. Standard valves fail rapidly — knife gate, pinch, and diaphragm valves are specifically designed for slurry.
Pressure Range
1–16 bar
Temperature
Ambient to 80°C
Industries
Mining (ore slurry, tailings), Cement (slurry preparation), Power (fly ash, bottom ash)
Key Properties — Slurry — Abrasive Pulp / Mineral Slurry
- Abrasive wear is the primary failure mode — not corrosion
- Solids content typically 5–60% by weight
- High viscosity at high solids content — requires full-bore flow path
- Settling in dead-legs and valve ports causes jamming
- pH ranges widely — from acidic mineral slurry to neutral tailings
Material Compatibility — Slurry — Abrasive Pulp / Mineral Slurry
Ratings are indicative. Actual compatibility depends on concentration, temperature, velocity, and presence of contaminants. Always consult corrosion tables or a materials engineer.
| Material | Rating | Notes |
|---|---|---|
| Hard rubber lining (natural rubber) | Excellent | Rubber absorbs abrasion impact — industry standard for slurry valves. |
| High-chrome cast iron (25–28% Cr) | Excellent | Hardest metallic material — used for knife gates in highly abrasive ore slurry. |
| Polyurethane lining | Good | Good for fine particle slurry — better than rubber for higher temperature. |
| SS 316L / 317L | Fair | Acceptable only for mildly abrasive slurry — limited by wear, not corrosion. |
| Carbon Steel (unlined) | Poor | Rapid wear in abrasive slurry. Acceptable only for very low-velocity or coarse-settle slurry. |
| PTFE-lined | Fair | PTFE has poor abrasion resistance — not for high-velocity or coarse abrasives. |
Recommended Valves
Rubber-lined knife gate valve
Primary isolation in mineral slurry, tailings, and cement slurry — AWWA C520 standard
Rubber-sleeved pinch valve
Zero internal metallic parts — sleeve wears and is replaced, not the valve body
Diaphragm valve (rubber diaphragm)
Low-pressure, fine slurry and chemical slurry — no dead-leg behind diaphragm
High-chrome cast iron slurry gate valve
Highly abrasive coarse ore slurry where rubber wear is too fast
Valves to Avoid
Ball valves (abrasion in seat area causes rapid failure)
Globe valves (dead space behind disc traps solids)
Butterfly valves (disc creates solids buildup upstream)
PTFE-seated valves in coarse or high-velocity slurry
Special Considerations
Applicable Standards
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