Hydrodynamic characterization and optimization of Contra-push check valve by numerical simulation

Han, Xu; Guang, Zheng; Qi, Yu Yi

doi:10.1016/j.anucene.2011.01.013

Cited by 37 publications

(17 citation statements)

References 10 publications

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“…Tsukahara et al [10] took advantage of CFD to study the vortex flow in a cylinder. Han et al [11] investigated the flow coefficients of a contra-push check valve through CFD technology. Kocaman [12] even used CFD to predict the backwater profiles when a bridge was designed.…”

Section: Highlights • a Combination Of Cfd And Experimental Tests Wasmentioning

confidence: 99%

Research and Analysis of the Hysteresis Characteristics of a Large Flow Directional Valve

Liao¹,

Yuan²,

Zi-sheng³

et al. 2015

SV-JME

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The 1000 L/min large flow hydraulic system for the hydraulic support used in a coal mine is currently a topic of great interest. The large flow directional valve is a key component for hydraulic systems, so the design of the 1000 L/min large flow directional valve is essential. The designed single-channel valve shows serious hysteresis characteristics in a 1000 L/min large flow condition, but it does not happen in a 16 L/ min small flow condition. Based on this phenomenon, the computational fluid dynamics (CFD) technology was used to simulate the flow in the valve. It was discovered that the single-channel caused unbalanced pressure in the annular region and on the surface of the valve spool, so the valve spool is subjected to great radial unbalanced force. Then a double-channel valve was designed to improve the pressure distribution. The simulated radial unbalanced force on the double-channel valve is 67.2% lower than that of the single-channel valve. The experimental results showed that the hysteresis characteristics also disappeared under the 1000 L/min large flow condition. Therefore, the conclusion can be drawn that the hysteresis characteristics of the single-channel valve is due to the radial unbalanced force caused by the unsymmetrical flow field. The results show that the maximum radial unbalanced force the valve spool can withstand is 170 N. Furthermore, symmetrical flow passages have to be taken into account in large flow conditions. This paper provides valuable references for the design of large flow valves.

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Section: Highlights • a Combination Of Cfd And Experimental Tests Wasmentioning

confidence: 99%

Research and Analysis of the Hysteresis Characteristics of a Large Flow Directional Valve

Liao¹,

Yuan²,

Zi-sheng³

et al. 2015

SV-JME

View full text Add to dashboard Cite

show abstract

“…Equation (6) shows that the outlet pressure P out is calculated by L v , and Q v . Equations (7) - (9) indicate that the spring stiffness K s and pre-stressed spring length L 0 are determined by L v , and F. However, the value of L v in a certain inlet pressure cannot be obtained directly from the experiment.…”

Section: Governing Equations and Turbulence Modelsmentioning

confidence: 99%

“…Depster et al [4] and Depster and Elmayyah [5] reported a 2D representation by using Reynolds-averaged Navier-Stokes equations and standard k-ε turbulence model to investigate the force-lift and flow-lift characteristics of a spring-operated safety relief valve. Han et al [6] presented the steady and transient characteristics of a Contra-push check valve (CPCV) simulated by CFD codes. Results show that the size of the gap between plug and sleeve is a key factor in CPCV design, another one is annular area of the plug.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Regulating Performance of Direct-Operated Pressure Regulator for a Microirrigation Lateral

Zhang

2015

Computer and Computing Technologies in Agriculture VIII

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A lateral inlet direct-operated pressure regulator is a novel device for microirrigation system that ensures the equal operating pressure of the lateral inlet required for high uniformity. This study develops a computational fluid dynamics (CFD) model in combination with inlet pressure and regulation assembly displacement to analyze the outlet pressure of the pressure regulator. The model is validated by a comparison of experimental measurements, and the predicted results show good agreement. The effects of the regulation assembly displacement and geometrical structure (regulation assembly inlet height) on regulating performance are investigated. Results show that the magnitude of the regulation assembly movement affecting by inlet pressure, preset pressure, and flow rate significantly changes in the beginning of the regulation range and then changes slowly. The spring parameters can be designed according to the force-displacement characteristic (the F-L v curve) of the T-shape regulating plunger. A greater regulation assembly inlet height corresponds to a lower preset pressure and less sensitivity of pressure loss to the movement of the regulation assembly. The pressure distribution through the regulator provides an improved understanding of the pressure difference in the regulating plunger with various displacements. The CFD model can reflect the motion characteristics of the regulation assembly and reveal the key factor of the regulator design. The results form the sound basis for future design and performance optimization of pressure regulator.

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“…According to the geometric parameters and physical properties of steam under working status, the Reynolds number is higher than 10 5 , so the flow is classified as severe turbulent flow. In addition, the RNG k-ε model proved to be the more accurate to describe the flow inside the valve (Xu et al, 2011). Thus, the RNG k-ε turbulent model and density-based solver were used to simulate the compressible gas flow of high Reynolds number.…”

Section: Mesh and Boundary Conditionsmentioning

confidence: 99%

Numerical simulation and structure improvement of double throttling in a high parameter pressure reducing valve

Jin

Lin

Li-long

et al. 2013

J. Zhejiang Univ. Sci. A

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In this paper, a new pressure reducing valve (PRV) with an orifice plate is proposed. The main objective is to explain the mechanisms of pressure reduction and energy conversion in the new PRV. A numerical simulation method was used to investigate the PRV internal flow field and to analyze the throttling effects of the orifice plate and the transform of thermal parameters as outlet pressure, outlet temperature, velocity, and superheat. A structure improvement method for the valve body and orifice plate is put forward to reduce energy loss. The governing equations for internal flow numerical simulation are composed of the continuity, momentum, energy and k-ε transport equations, based on isotropic eddy viscosity theory. Different valve plug displacement models were built to describe the double throttling process. Our analysis shows that the steam pressure drops twice and the degree of superheat increases. There are also lots of eddies which clog the flow channel and disturb the steam flow in the valve cavity after the valve plug and the outlet cavity. After modifying the structure, the numerical results show a better performance of steam flow.

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Hydrodynamic characterization and optimization of Contra-push check valve by numerical simulation

Cited by 37 publications

References 10 publications

Research and Analysis of the Hysteresis Characteristics of a Large Flow Directional Valve

Research and Analysis of the Hysteresis Characteristics of a Large Flow Directional Valve

Numerical Simulation of Regulating Performance of Direct-Operated Pressure Regulator for a Microirrigation Lateral

Numerical simulation and structure improvement of double throttling in a high parameter pressure reducing valve

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