Design of cages in globe valve

Chern, Ming‐Jyh; Wang, Chen-Hua; Lu, Guan-Ting; Tseng, Po-Yi; Cheng, Yeuan-Jong; Lin, Chin-Teng; Hu, Changming

doi:10.1177/0954406214535387

Cited by 8 publications

(7 citation statements)

References 13 publications

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“…Extensive CFD studies of valve flows have been conducted in support of understanding and improving designs. Some examples of such CFD studies can be found in [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Similar to experimental measurements, there are uncertainties/errors in all of the industrially practical CFD methods.…”

Section: Introductionmentioning

confidence: 99%

An assessment of eddy viscosity models on predicting performance parameters of valves

Duan

Jackson

Eaton

et al. 2019

Nuclear Engineering and Design

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The major objective of the present study is to evaluate the performance of a range of turbulent eddy viscosity models in the prediction of macro-parameters (flow coefficient (CQ) and force coefficient (CF)), for certain types of valve, including the conic valve, the disk valves, and the compensated valve. This has been achieved by comparison of numerical predictions with experimental measurements available in the literature. The examined turbulence models include most of the available turbulent eddy viscosity models in STAR-CCM+ 12.04. They are the standard k-ε model, realizable k-ε model, k-ω-sst model, V2F model, EB k-ε model and the Lag EB k-ε models. The low-Re turbulence models (k-ω-sst, V2F, EB k-ε and Lag EB k-ε) perform worse than the high-Re models (standard k-ε and realizable k-ε). For the conic valve, the performance of different turbulent models varies little; the standard k-ε model shows a marginal advantage over the others. The performance of the turbulence models changed greatly, however, for prediction of CQ and CF of the disk and compensated valves. In general, the realizable k-ε model is demonstrated to be a robust choice for both valve types. Although the EB k-ε may marginally outperform it in the prediction of CF at large disk valve opening. The effects of the unknown entry flow and initialization conditions are also studied. The predictions are more sensitive to the entry flow condition when the valve opening is large. Additionally, the uncertainties caused by unknown entry conditions are comparable to overall modelling errors in some cases. For flow systems with multiple stable flow-states coexisting in the flow domain, the output of the numerical models can also be affected by the initialization conditions. When the streamline curvature and secondary flow is modest like conical valve flow, the nonlinear modification of the standard k-ε model and k-ω-sst model, as well as the curvature correction in the realizable k-ε model, will not have visible effects on the numerical prediction. Once the strong streamline curvature and secondary flow exit in the domain, such as the disk valve flow, the non-linear modification of the standard k-ε model will greatly improve the numerical outputs, however, the non-linear modifications of k-ω-sst model only have minor effects. Moreover, the curvature correction in the realizable k-ε model will jeopardise the accuracy of outputs in the same case.

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Section: Introductionmentioning

confidence: 99%

An assessment of eddy viscosity models on predicting performance parameters of valves

Duan

Jackson

Eaton

et al. 2019

Nuclear Engineering and Design

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“…The flow characteristics [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ] and dynamic characteristics [ 20 , 21 , 22 ] of a valve are the key indicators for judging the performance of the valve in a specific application. For the flow characteristics, research work has mainly focused on the flow coefficient.…”

Section: Introductionmentioning

confidence: 99%

“…Asim et al [ 18 ] focused on a valve trim made of a staggered arrangement of columns in a control valve, and they investigated the effects of the size of the flow path on the flow capacity and found a critical flow path size. Chern et al [ 19 ] numerically investigated the relationship between the flow coefficient and the flow cross-sectional area of the passages in a single cage and in multicages to help future valve cage design. For the dynamic characteristics, research work has mainly focused on the movement of the valve trim.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Microflow Characteristics in a V-ball Valve

Gao

Yang²,

Yang

et al. 2021

Micromachines

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V-ball valves are widely applied in many process industries to regulate fluid flow, and they have advantages of good approximately equal percentage flow characteristics and easy maintenance. However, in some applications, the V-ball valve needs to have good performance under both large and extremely small flow coefficients. In this paper, the improvement of the original V-ball valve is made and the flow characteristics between the original and the improved V-ball valve are compared. Two types of small gaps are added to the original V-ball, namely the gap with an approximately rectangular port and the gap with an approximately triangular port. The effects of the structure and the dimension of the gap on flow characteristics are investigated. Results show that within the gap, the flow coefficient increases but the loss coefficient decreases as the valve opening increases, and the flow coefficient has an approximately linear relationship with the flow cross-area of the added gap. Results also show that under the same flow cross-area, the flow coefficient has a higher value if the distance between the gap and the ball center is greater or if the gap is an approximately rectangular port, while the loss coefficient has an opposite trend.

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“…Lisowski and Filo 9 conducted CFD analysis to obtain flow characteristic of a proportional flow control valve and made some geometrical modifications to change its characteristics. Chern et al 10 designed a cage in globe valve to adjust its flow coefficient using both CFD and experimental methods. Cho and Jung 11 numerically investigated a flow control valve and discussed parameters that affected its valve characteristic.…”

Section: Introductionmentioning

confidence: 99%

“…Chern et al. 10 designed a cage in globe valve to adjust its flow coefficient using both CFD and experimental methods. Cho and Jung 11 numerically investigated a flow control valve and discussed parameters that affected its valve characteristic.…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics analysis on orifice structure inside valve core of pilot-control angle globe valve

Jin

Gao

Zhang

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

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A novel pilot-control angle globe valve is proposed, and it has an obvious advantage of energy conservation during its opening and closing process. In pilot-control angle globe valve, the opening and closing forces are related to the orifice located inside the valve core. In this paper, the effects of orifice diameter are thoroughly studied under different working conditions such as valve core displacements and inlet velocities. To begin with, the numerical model is validated by comparing similar angle valves, and then the flow and loss coefficients under different orifice diameters are discussed. It is found that the effects of orifice diameter on force acting on valve core depend on valve core displacement and inlet velocity. Thus different valve core displacements and inlet velocities combined with different orifice diameters are further studied. It is also found that when the orifice diameter is larger than 12 mm, pilot-control angle globe valve cannot be used under small inlet velocity or large valve core displacement. In addition, formulas to calculate forces on valve core are proposed for further orifice design. This work can be referred in process industries especially in a piping system with orifice plates or globe valves.

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Design of cages in globe valve

Cited by 8 publications

References 13 publications

An assessment of eddy viscosity models on predicting performance parameters of valves

An assessment of eddy viscosity models on predicting performance parameters of valves

Numerical Study of the Microflow Characteristics in a V-ball Valve

Computational fluid dynamics analysis on orifice structure inside valve core of pilot-control angle globe valve

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