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Figure 3: The internal lattice patterns of the Hexa-Shield™ sleeve, illustrating the concept of engineered structures for enhanced thermal insulation.
The Hexa-Shield™ sleeve features a double-walled structure with engineered internal lattice geometries, providing intrinsic insulation that slows heat transfer from the hot process media to the valve body. Multiple lattice patterns are employed within the sleeve to balance thermal insulation, mechanical integrity, and manufacturability( as shown in Figure 3). These
internal lattices function as a thermal buffer, reducing temperature gradients across the valve and minimizing thermal stresses, and fatigue cracking.
By integrating materials innovation, additive manufacturing, and practical maintenance considerations, the sleeve extends valve longevity, reduces the need for frequent inspections, and improves process reliability. This ensures that critical valves continue to operate safely and efficiently under the most demanding hydrocracking conditions, representing a stepchange in valve protection for the oil and gas industry.
Figure 4: An automated thermal shock test rig used to simulate rapid thermal cycling and evaluate sleeve performance.
Thermal Shock Testing and Prototype Evaluation
A custom automated thermal shock test rig replicating the severe thermal cycling experienced by valves in locations 5 and 6( see Figure 1) was developed to evaluate ™Hexa-Shield’ s performance. High-temperature and high-pressure steam were injected into the valve, followed by rapid cooling cycles. Multiple thermocouples captured temperatures at critical points on the valve body ID and OD, enabling detailed thermal profiling( see Figures 4 and 5).
8 Valve World Americas | October 2025 | www. valve-world-americas. com