Control Valve Rotational Flow Inducement for Slurry Wear Reduction
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Solution Overview
Problem
Highly abrasive and non-homogeneous slurries in letdown valves used in processes like HPAL cause accelerated wear and failure due to high velocities and surging, leading to reduced valve life and operational inefficiencies.
Innovation Solution
Control valves are designed to induce a rotational or circular motion in the fluid flow through features such as offset inlets and outlets, gallery configurations, and seat ring assemblies with circular motion inducement features, which separate gases from liquids and solids, reducing wear and stabilizing flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional letdown valves are used to reduce material flow from high pressure to lower pressure, then pressure reduction is achieved, but accelerated wear and valve failure occur due to high velocities and abrasive slurry
Solution Approach 1:
The patent employs curved flow paths and circular motion inducement features within the valve body to redirect slurry flow. The curved geometry transforms linear high-velocity flow into rotational flow, reducing the direct impact velocity of abrasive particles on valve surfaces while maintaining pressure reduction functionality.
Solution Approach 2:
The invention introduces a rotational dimension to the flow by implementing circular motion inducement features. This transforms the flow from a one-dimensional linear path to a two-dimensional rotational path, causing slurry to follow a circular trajectory that reduces direct impingement on valve components and distributes wear more uniformly.
2Productivity
If high velocity flow is maintained through letdown valves, then pressure reduction efficiency is improved, but flow surging and vibrations occur due to non-homogeneous slurry mixture
Solution Approach 1:
The curved flow paths and circular motion features smooth out flow transitions and reduce turbulence caused by non-homogeneous slurry. The gradual curvature changes prevent flow separation and reduce the likelihood of surging, maintaining stable high-velocity flow throughout the pressure reduction process.
3Device complexity
If linear flow path is used in letdown valve, then structural simplicity is maintained, but direct impact of slurry causes accelerated wear and forces on plug head
Solution Approach 1:
The valve body incorporates curved flow paths and circular motion inducement features that redirect slurry flow away from direct impact zones. These curved geometries are integrated into the existing valve structure, adding rotational flow capability without requiring complete structural redesign, thus balancing complexity reduction with impact force mitigation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The induced rotational motion separates gas and liquid components, reducing abrasive wear on valve components, stabilizing flow, and extending valve life by slowing down the slurry flow, thus improving the operational efficiency and longevity of letdown valves.
Implementation Method 1
Control valves configured to induce a rotational motion into a flow of materials flowing therethrough
Implementation Method 2
The induced rotational motion separates gas and liquid components
Data Source
AI summary
Valves comprise a valve body having a gallery coupled to an inlet and an outlet to facilitate a fluid flow therethrough. A plug is movably disposed within the valve body and a seat ring assembly may be coupled to the outlet of the valve body. At least one circular motion inducement feature is positioned in a portion of the valve body, the seat ring assembly, or both. The at least one circular inducement feature is configured to induce a circular motion in a fluid flow through the valve. Methods of creating a circular flow in a fluid flowing through a valve are also disclosed.