Why Do Some SlurryFlo Control Valves Have a Flat-Bottom Gate?

Increased Valve Cv

The flat bottom allows SAF engineers to increase the valve’s Cv (beyond what is possible with the concave gate on traditional SlurryFlo control valves).

The increase is gained via a seat plate with longer/larger port, which operates with the gate’s extended stroke capability.

This design is typically implemented when specifying a larger diameter valve is not feasible (or not desired), and the slight increase in Cv provides sufficient additional flow capacity.

Flat Gate Design

SlurryFlo Control Valve with Flat Bottom Gate Design

Curved Gate Design

SlurryFlo Control Valve with Concave Gate Design
SlurryFlo Control Valve with Flat Bottom Gate Design and custom Orifice

Improved ‘Low-Flow’ Control

In extreme conditions, where SlurryFlo control valves throttle below ~20% open, the discharge jet can become turbulent, with undesirable jetting. Over time (and on occasion), this jetting may erode the piping downstream of the valve.

To mitigate this effect, SAF engineers will integrate the flat-bottom gate with a custom seat plate geometry. This combination significantly reduces turbulent flow at the lowest flow rates.

Patented Design

Our patented flat-bottom gate design is backed by years of design development, flow simulation analysis, and real-world testing. This unique trim iteration has exceeded customer expectations in the most challenging of applications.

It’s another example of why Special Alloy Fabricators is known for innovation and ingenuity within the severe service control valve industry.
Patented SlurryFlo Control Valve with Flat-Bottom Gate
Flat Bottom Gate SlurryFlo Control Valve
Flat Bottom Gate SlurryFlo Control Valve
Flat Bottom Gate SlurryFlo Control Valve
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