Design Considerations for Fixed-Cone Valve with Baffled Hood

Stephens, Dallin P.; Johnson, Michael C.; Sharp, Zachary B.

doi:10.1061/(asce)hy.1943-7900.0000496

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…In recent years, CFD models have been applied for solving several hydraulic engineering problems. In this way, CFD has been used for a variety of purposes, as simulations of flow transient in pipes [19,20], behaviour of different control valves under different conditions [21][22][23][24], mixing models in water distribution systems [25][26][27][28], or for the characterization of elements in open channels [29][30][31][32][33][34].…”

Section: Computational Fluid Dynamics (Cfd) Modellingmentioning

confidence: 99%

Computational Determination of Air Valves Capacity Using CFD Techniques

García-Todolí

Iglesias-Rey

Mora-Meliá

et al. 2018

Water

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The analysis of transient flow is necessary to design adequate protection systems that support the oscillations of pressure produced in the operation of motor elements and regulation. Air valves are generally used in pressurized water pipes to manage the air inside them. Under certain circumstances, they can be used as an indirect control mechanism of the hydraulic transient. Unfortunately, one of the major limitations is the reliability of information provided by manufacturers and vendors, which is why experimental trials are usually used to characterize such devices. The realization of these tests is not simple since they require an enormous volume of previously stored air to be used in such experiments. Additionally, the costs are expensive. Consequently, it is necessary to develop models that represent the behaviour of these devices. Although computational fluid dynamics (CFD) techniques cannot completely replace measurements, the amount of experimentation and the overall cost can be reduced significantly. This work approaches the characterization of air valves using CFD techniques, including some experimental tests to calibrate and validate the results. A mesh convergence analysis was made. The results show how the CFD models are an efficient alternative to represent the behavior of air valves during the entry and exit of air to the system, implying a better knowledge of the system to improve it.

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Section: Computational Fluid Dynamics (Cfd) Modellingmentioning

confidence: 99%

Computational Determination of Air Valves Capacity Using CFD Techniques

García-Todolí

Iglesias-Rey

Mora-Meliá

et al. 2018

Water

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“…[3] In addition to this, many studies have been conducted on experiments and computational numerical analysis for hollow jet valve and cone valve, etc. [4,5,6,7,8,9], but there is little research on how the flow phenomenon according to the speed at which the 823 hollow jet valve is opened affects the vibration of the valve.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study on the Flow Characteristics According to the Operating Speed of Hollow Jet Valve

et.al¹

2021

TURCOMAT

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Various types of valves are installed in the emergency discharge facility of dams, and when water is discharged in an emergency, vibration may occur in the valve depending on operating conditions. In this study, for the hollow jet valve, which is frequently used in the emergency discharge facility of dam, the flow phenomenon occurring according to the operating speed of the valve was observed and the vibration characteristics according to the operating speed were investigated through CFD.In particular, when the hollow jet valve is closed, the valve casing is opened while the inside of the valve casing is filled with air, and the open position is also changed during the opening time, thus the calculation was performed using the unsteady 2-phase overset mesh technique.As a result of calculation through CFD, it was found that when the operating speed of the hollow jet valve was changed, the time range of vibration appeared differently, and the value of the drag coefficient generated was also changed. In addition, it was found that the location of vibration generated according to the operating speed is generated at mostly identical locations, the cause of the vibration is not the vibration caused by the hydraulic pressure exiting the hollow jet valve, and it can be seen that the atmosphere outside the valve flows into the valve casing, creating a complex flow phenomenon inside the valve casing and acting as the cause of vibrating the hollow jet valve.

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“…Stephens et al 16 proposed a new structure of fixed cone valves with baffled hood using CFD method. Yi et al 17 experimentally studied cavitation and vibration inside a relief valve and discussed their interactions.…”

Section: Introductionmentioning

confidence: 99%

“…Stephens et al. 16 proposed a new structure of fixed cone valves with baffled hood using CFD method. Yi et al.…”

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 Considerations for Fixed-Cone Valve with Baffled Hood

Cited by 5 publications

References 4 publications

Computational Determination of Air Valves Capacity Using CFD Techniques

Computational Determination of Air Valves Capacity Using CFD Techniques

A Numerical Study on the Flow Characteristics According to the Operating Speed of Hollow Jet Valve

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

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