what is the best valve for slurry flow control?

In the world of control valves, there are numerous designs that will successfully modulate the flow of clean fluids. However, if the fluid contains solids, the scenario becomes more challenging. These ‘clean fluid’ valves are not a viable option for slurry duty, as their complex flow paths can erode or become plugged very quickly.
End users needing to modulate the flow of abrasive slurry must select alternative valves with simple ‘line of sight’ trim geometry, such as ball valves, butterfly valves and pinch valves. These designs provide relatively little flow re-direction and minimal interference with the abrasive slurry.

control valve comparison

The downside to typical ‘line of sight’ valves is that fluid velocity through their restricted opening is much greater. This increases the rate of erosion and the valve’s susceptibility to cavitation, resulting in frequent valve replacements, pipe erosion, damage to ancillary equipment, down time and labour costs.

Ball Valve

Ball valves are a popular choice due to having various orifice geometries available upon order (e.g. Reduced ports, V-ports, Narrow slots, etc), which will provide different control characteristics. However, when throttling, all trim designs will direct abrasive flow into valve body and piping, eroding both.

Butterfly Valve

Butterfly valves are typically selected for applications that have space constraints, as their body designs are among the narrowest in the industry. Despite their dimensional advantage, erosive slurry will be accelerated around both sides of the butterfly disc, significantly reducing the valve’s service life.
Butterfly Valve
Butterfly Valves accelerate slurry to both sides of the butterfly disc.
Butterfly Control Valve Flow Render

knife gate Valve

Knife gate valves are the least desirable valve for controlling abrasive slurry. When the gate modulates, acute angles are formed between the gate and valve body. These angles produce high fluid velocities, increasing the wear rate significantly. These valves are typically found in large diameter pipe, as they are economical by comparison.
Knife Gate Valve
Knife Gate Valve
Knife Gate Valves flow render

pinch Valve

Pinch valves are a mining industry favorite; they work well in most applications and are relatively inexpensive. However, they do have their limitations. As the elastomer sleeve is ‘pinched’, abrasive flow is accelerated within the valve, with the highest velocities (and sleeve wear) occurring in the corners. 
Pinch Valve
Pinch Valve
Pinch Valve flow render

slurryflo control Valve

The SlurryFlo Control Valve provides a unique solution to the drawbacks of the other conventional severe service control valves. SlurryFlo's patented trim design centralizes flow within the pipe to protect the valve body and downstream piping from wear and erosion. The control valves are custom engineered for application requirements and last 3-10 times longer than other slurry control valves.
SlurryFlo Valve
Centered Orifice of a SlurryFlo valve trim
Centered flow from SlurryFlo control valve.
SlurryFlo control valve in modulating position.

The SlurryFlo Difference

Custom Engineered
Extreme Abrasion Resistance
Patented Trim Design
Field Replaceable Wear Components
Centralized Flow
Reduced Downtime and Maintenance
Zero Damage to the Valve Body
State-of-the-art 3D and CFD Software
Reduced Piping Wear
Dozens of standard and exotic materials
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