Abstract
In this study, the pressure distribution and flow coefficient of a globe valve are investigated with a series of experiments conducted in a flow test loop. The experiments are performed on a three-inch model test valve from an eight-inch ANSI (American National Standards Institute) B16.11—Class 2500# prototype globe valve with various pump speeds and full range of valve openings. Both inherent and installed flow characteristics are measured, and the results show that the flow coefficient depends not only on the valve geometry and valve opening but also on the Reynolds number. When the Reynolds number exceeds a certain value, the flow coefficients are stable. In addition, the pressures at different positions in the upstream and the downstream of the valve are measured and compared with recommendation per ANSI/ISA-75.01 standard. The results show that, in single-phase flow, the discrepancies in pressure between different measurement locations within close range of 10 nominal diameter from the valve are inconsiderable.
Highlights
Globe valves are widely used in ships and offshore structures to regulate the flow of fluids in piping systems
Cho et al [2] performed a series of experiments and computational fluid dynamics (CFD) analysis of the pressure distribution and forces acting on the top and bottom planes of the valve plug
Based on a numerical investigation on a stop valve, Yang et al [3] showed that the main pressure drop occurred along the valve throat because the circulation area diminished when the fluid flows through the valve throat
Summary
Globe valves are widely used in ships and offshore structures to regulate the flow of fluids in piping systems. Davis and Stewart [10,11] used the axisymmetric numerical model to predict the inherent characteristic of the globe control valve, and the simulation results were validated by experimental procedure guided by ANSI/ISA-75.01. The result showed that the venturi, V-cone and wedge flow meters have nearly constant discharge coefficients for moderate to high Reynolds number range applications. Globe valves are available in a broad spectrum of sizes and materials, there were few investigations focusing on the relationship between the flow inside the valve and its pressure characteristics around the valve, which would be critical to improve their performances and to reduce possible damage. Pressure distributions along the upstream and the downstream of the globe valve were measured and compared to the reference pressure tap positions recommended by the ANSI/ISA-75.01-2012 standard [17]
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