Mining Application

Tailings Pipeline, Pump & Spigot Isolation

Extend maintenance intervals and ensure environmental protection with valves engineered for high pressure and high solids tailings.
Mine Tailings

Maximize Mill Uptime With Reliable Tailings Management

Mill waste, or tailings, are abrasive and cause severe wear on piping components as they are collected and delivered to the tailings storage facility (TSF). Tailings applications often see the highest solids content slurry, and highest pipeline volume, and can have a wide range of pressures. Isolation valve performance and life span have a direct impact on mill throughput and operating costs.

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Recommended Products

The following products are capable of providing zero leakage shutoff through high pressure, high solids content slurry. These valves are engineered for an extended cycle life in abrasive media and rapid, on-site repair to maximize uptime.

Clarkson KS1 Severe Service Knife Gate Valve
Clarkson KS1 ASME Class 150 Severe Service Knife Gate Valve
Emerson’s Clarkson KS1 is a TRUE bi-directional, zero – leakage ASME Class 150 knife gate valve, specifically designed to handle the challenges of severe service applications. Engineered to prolong valve longevity and maintenance intervals, the KS1 aims to offer a lower total cost of ownership.
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  • TRUE bi-directional, zero leakage performance for severe services
  • Patented gate edge seal system eliminates leakage through top of valve
  • Heavy cross-section, precision-molded elastomer seat increases sealing surface area to maintain zero-leakage performance for more cycles
Size Range
DN 50 - 750 (NPS 2 - 30)
Temperature Rating
205°C (400°F)
Pressure Rating
ASME Class 150
Model KGF/KGF-HP Knife Gate Valve
Clarkson KGH High Pressure Slurry Knife Gate Valve
The Clarkson KGF and KGF-HP slurry knife gate valves provide proven slurry valve technology in higher pressures
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  • High pressure designs for the most challenging applications:
    KGF: 20 bar (300 psi) CWP optional gate provides 31 bar (450 psi) CWP
    KGF-HP: class 300 (51 bar [740 psi] CWP)
  • 100% isolation bubble-tight shut-off results in absolute zero downstream leakage.
  • Double-seated design provides bi-directional flow and shutoff.
Valve Type
Knife Gate Valve, Slurry Knife Gate Valve
Model KGF/KGF-HP Knife Gate Valve
Clarkson KGF High Pressure Slurry Knife Gate Valve
The Clarkson KGF and KGF-HP slurry knife gate valves provide proven slurry valve technology in higher pressures
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  • High pressure designs for the most challenging applications:
    KGF: 20 bar (300 psi) CWP optional gate provides 31 bar (450 psi) CWP
    KGF-HP: class 300 (51 bar [740 psi] CWP)
  • 100% isolation bubble-tight shut-off results in absolute zero downstream leakage.
  • Double-seated design provides bi-directional flow and shutoff.
Valve Type
Knife Gate Valve, Slurry Knife Gate Valve
Model KGD Wafer Style Slurry Valve
Clarkson KGD Wafer Slurry Knife Gate Valve
The Clarkson KGD wafer style slurry knife gate valve is a high-quality, bi-directional isolation valve designed for optimal performance, durability, and reliability. Ideal for heavy-duty applications requiring ultimate sealing, it offers the latest in elastomer technology with the Mark III sleeve design.
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  • 100% isolation, bubble-tight shut-off - ensures absolutely zero downstream leakage. 
  • Double-seated design - provides bi-directional flow and shut-off, allowing for smooth operation. 
  • Unobstructed flow - eliminates turbulence, minimizes pressure drop across the valve, and prevents any accumulation of solids. 
Size Range
NPS 2 to 24 (DN 50 to 600)
Temperature Rating
Up to 300°F (150°C)
Pressure Rating
Up to 200 psi (14 bar) CWP
Figure SU10R Polyurethane Knife Gate Valve
Clarkson SU10R Medium Slurry Knife Gate Valve
The SU10R valve provides bi-directional isolation and features a field replaceable snap-in liner for enhanced protection against abrasion and corrosive slurries, resulting in improved reliability and service life.
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  • TRUE bi-directional flow and shut-off: allow the valve to be installed in either direction and provide versatility in its application.
  • Unique one-piece precision molded high strength polyurethane liner: protects the wetted parts from corrosion and abrasion, ensuring durability and longevity of the valve.
  • Compact two-piece split body construction: offers ease of maintenance, making it easier to service and repair the valve as needed.
Size Range
NPS 2 - 24 (DN 50 - 600)
Temperature Rating
Up to 250 °F (120 °C)
Pressure Rating
150 psi (1000 kPa)

Expert Insights

Andy Coxall
Improving Tailings Management in Mining Operations

Andy Coxall joins podcast host Jim Cahill to discuss the challenges in tailings management, the problems with valves not suited for this severe-service application, and why severe-service knife gate valve technology such as the Clarkson KS1 is the best choice for these challenging slurry applications.

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Sharon McCurdy
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