A simple method for high-precision evaluation of valve flow coefficient by computational fluid dynamics simulation

Zhou, Xiaoming; Wang, Zhikun; Yi-fang, Zhang

doi:10.1177/1687814017713702

Cited by 11 publications

(6 citation statements)

References 17 publications

(43 reference statements)

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“…A larger value of the flow coefficient (Cv) indicates a better flow capacity of the regulating valve. For incompressible fluids [27],…”

Section: Fluid Propertiesmentioning

confidence: 99%

Design of Noise-Reducing Two-Stage Cage Control Valve and Its Fluid Characteristics and Cavitation Study

2022

Journal of Chemistry

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For all kinds of media noise, noise reduction valve cage cannot meet the equal percentage flow characteristics, and for manufacturing and processing and other technical problems, research and design of new noise reduction two-stage cage control valve are necessary. The valve adopts noise reduction valve cage and curve valve cage with noise reduction, forming a two-stage noise reduction, with uniform flow, diffusion, and noise reduction effect, to meet the regulating valve equal percentage flow characteristics. The spool is evenly stressed and not easy to loosen and fall off, and the small opening is not easy to vibrate and shake. The flow characteristics of the noise-reducing two-stage cage control valve are studied, and the fluid flow coefficients, flow characteristic curves, the relationship of flow coefficients with nominal diameter at the same stroke, and the relationship of flow coefficients with different nominal diameters at different strokes are analyzed. The relationship between nominal diameter constant opening and cavitation coefficient with inlet velocity, the relationship between inlet velocity and cavitation coefficient with nominal diameter at half opening, and the relationship between inlet velocity and cavitation coefficient with nominal diameter at full opening were studied, and the cavitation generation and its effect on noise were analyzed. The noise and cavitation test showed that noise is very small and cavitation is difficult to produce, all meeting the noise reduction requirements.

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“…A larger value of the flow coefficient (Cv) indicates a better flow capacity of the regulating valve. For incompressible fluids [27],…”

Section: Fluid Propertiesmentioning

confidence: 99%

Design of Noise-Reducing Two-Stage Cage Control Valve and Its Fluid Characteristics and Cavitation Study

2022

Journal of Chemistry

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“…Hence, the shape and size of the openings through which the flow has to take place in a control valve, has a significant effect on the flow capacity. Zhou et al [12] developed a simplified methodology in order to quantify the flow capacity of a valve. Extensive CFD based investigations have been carried out to accurately quantify the fundamental flow parameters within a valve.…”

Section: Figure 1 Different Components Of a Control Valvementioning

confidence: 99%

Effects of the geometrical features of flow paths on the flow capacity of a control valve trim

Asim

Mishra

Oliveira-Jr

et al. 2019

Journal of Petroleum Science and Engineering

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Control valves are an integral part of a number of energy systems, such as those used in chemical and nuclear industries. These valves are used to regulate the amount of fluid flow passing through these systems. A key component of a control valve is its trim, which in case of a multi-stage continuous-resistance trim consists of a staggered arrangement of columns.Flow passing through the channels formed between adjacent columns (also called as flow paths), loses a significant amount of its energy and regulates the pressure field. As the geometrical features of these flow paths dictate the flow capacity of the trim, systematic investigations have been carried out to analyse the complex flow behaviour within these flow paths. Well-verified computational fluid dynamics based solver has been used to investigate the effects of the geometrical features of flow paths on the flow capacity of the trim, at various valve opening positions. It has been noticed that reducing the size of flow paths increases the flow capacity of the trim, however, at a critical flow path size, the inherent opening characteristics of a trim have been observed to alter. In order to recover the original opening behaviour of the trim, careful manipulation of the flow paths is required, which has been successfully achieved in the present investigation.

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“…To understand the flow characteristics of the steam in the valve, the flow coefficient was calculated by the inlet pressure, the outlet pressure and the outlet flow rate from simulation results. For a compressible gas flowing in the butterfly valve, the flow coefficient C v was stated as follows [25]:…”

Section: Flow Coefficientmentioning

confidence: 99%

Numerical analysis of flow field in link rod butterfly valve for high-temperature steam

Kan

Chen

2020

J Braz. Soc. Mech. Sci. Eng.

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The link rod butterfly valve, which uses a four-bar linkage mechanism to drive the valve plate, is a promising candidate for treating high-temperature steam and industrial exhaust because of its reliable sealing property. In this paper, the 3D flow field in the link rod butterfly valve for high-temperature steam was simulated using computational fluid dynamics. The flow coefficient of the valve, the velocity field, the temperature distribution and the enthalpy change in the steam under different valve openings were studied. The results showed that the flow coefficient of the link rod butterfly valve increased with an accelerated slope as the rotation angle of the valve stem was enlarged over 60°. The velocity and the vorticity of the steam were dramatically increased near the valve. The steam branches were accelerated up to 15 times the inlet flow velocity when they passed through the gaps between the valve plate and the valve body, and the vorticity was as large as 76/s. The temperature of the steam passing through the valve was decreased by 50-108 K for different openings. The temperature difference in the steam on the valve plate was as high as 400 K, which makes a challenge for the material of the valve plate. Larger enthalpy drop of the steam was resulted in when the valve was working at the throttling state than fully opened. Local peaks for the enthalpy drop were observed as the valve stem was rotated by 30° and 60°, and the local valley was at about 50°. The present study may serve as a useful reference for the design of link rod butterfly valves.

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A simple method for high-precision evaluation of valve flow coefficient by computational fluid dynamics simulation

Cited by 11 publications

References 17 publications

Design of Noise-Reducing Two-Stage Cage Control Valve and Its Fluid Characteristics and Cavitation Study

Design of Noise-Reducing Two-Stage Cage Control Valve and Its Fluid Characteristics and Cavitation Study

Effects of the geometrical features of flow paths on the flow capacity of a control valve trim

Numerical analysis of flow field in link rod butterfly valve for high-temperature steam

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