Methods for computing work processes and improving the cryogenic shut-off and control valves design in the pneumohydraulic systems

The paper presents a method for computing work process in the cryogenic valves based on the theory of computational fluid dynamics and conjugated heat transfer. The friction heat dependence on the valve capacity is derived. The developed mathematical model makes it possible to determine the cryogenic valve heat flow values with the different types of insulation and the final value of heat supplied to the cryogenic product. Based on the computation results, the flow cavity design of the straight-through valve was improved. The new design raised technical characteristics compared to the original ones. Its capacity was increased by 56.8%, and friction heat was reduced to 1.3 W. Final heat value supplied to the cryogenic product of improved design in the case of screen-vacuum insulation was 3.67 W, which was by 33% less than that original one. Based on the computed values ??of heat flows in the valve three-dimensional models with different types of insulation, they were numerically compared.
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