CFD analysis of flow forces and energy loss characteristics in a flapper–nozzle pilot valve with different null clearances

Aung, Nay; Yang, Qingjun; Chen, Meng; Li, Songjing

doi:10.1016/j.enconman.2014.03.076

Cited by 75 publications

(37 citation statements)

References 17 publications

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“…The obtained results indicate, that the groove shape has significant effects on the flow characteristics of the spool valve. Related studies with respect to a flapper-nozzle pilot valve were carried out by Aung et al [16]. In this case, the CFD methods were applied to calculate the flow forces for different values of a null clearances.…”

Section: Introductionmentioning

confidence: 99%

Pressure compensation using flow forces in a multi-section proportional directional control valve

Lisowski

Filo

Rajda³

2015

Energy Conversion and Management

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Section: Introductionmentioning

confidence: 99%

Pressure compensation using flow forces in a multi-section proportional directional control valve

Lisowski

Filo

Rajda³

2015

Energy Conversion and Management

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“…A computational fluid dynamics (CFD) analysis 14 of flow forces and energy loss characteristics in a flappernozzle pilot valve is performed.…”

Section: Introductionmentioning

confidence: 99%

Design criterion involving comprehensive performance characteristics of nozzle–flapper valves

Zhu

Fei

2016

Proceedings of the Institution of Mechanical Engineers, Part I:

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The traditional parameter design rule for the nozzle-flapper valves has always followed the maximum control pressure sensitivity criterion; however, this article queries the validity of this traditional parameter design theory for the comprehensive performance characteristics of a flapper-nozzle valve. Accordingly, a new parameter design rule, which involves symmetry, linearity and sensitivity of the control pressure, was constructed from a detailed and rigorous mathematical derivation that employs a non-dimensional analysis method. Then, an effect verification of the new criterion and a comparison between the pressure-flow curves and three key valve coefficients, which are dominated by the traditional rule and the new criterion, respectively, are performed. Finally, the comprehensive performance characteristics of the flapper-nozzle valve, such as the reliability, response, accuracy, sensitivity, efficiency, anti-disturbance and control pressure range, which are produced by the two parameter design rules, are compared. The results indicate that the performance of nozzle-flapper valve followed by the new parameter design criteria is superior to the performance directed by the traditional one with respect to various indexes, such as the reliability, response, accuracy and anti-disturbance. In addition, for the design of nozzle-flapper valves, the studies have also revealed that the optimal values of the structural parameter are dependent on the actual flapper motion ranges and the priority of the above-mentioned performance indexes. All these new findings can develop and supplement the existing design theory of nozzle-flapper valve and can also be beneficial to the design of double-nozzle-flapper electro-hydraulic servo valves.

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“…In the research reports listed in section I [3][4][5][6][7][8][9][10][11][12] and the textbooks [1,2] on hydraulic control systems, the flow force in servovalves is described to be a symptom that should be reduced as small as possible. However, the degree of the harmful effects of it on the valve performances is not described in detail.…”

Section: Effects Of the Flow Force On The Valve Performances (Simumentioning

confidence: 99%

“…There are many research works related to the flow force, some of them study flow force in the flapper [4,5] and the others study flow force in the spool valve. Flow force has been calculated from the mathematics model in [6,7].…”

Section: Introductionmentioning

confidence: 99%

Effects of flow force on the characteristics of electrohydraulic servovalves

Istanto

Kim

et al. 2015

2015 International Conference on Automation, Cognitive Science, Optics, Micro Electro-Mechanical System, and Information Techno

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In this study, the effects of flow force applied to the spool in electrohydraulic servovalve on the valve's performances are investigated. First, experiments investigating flow force in an electrohydraulic servovalve is conducted, and various physical parameters of the servovalve are measured. Then, a simulation program for the valve was developed based on the full mathematical model of the servovalve, using the measured physical parameters' values and the experimental results on the flow force. The effects of the flow force on the valve performances are described in detail based on the simulation results.

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CFD analysis of flow forces and energy loss characteristics in a flapper–nozzle pilot valve with different null clearances

Cited by 75 publications

References 17 publications

Pressure compensation using flow forces in a multi-section proportional directional control valve

Pressure compensation using flow forces in a multi-section proportional directional control valve

Design criterion involving comprehensive performance characteristics of nozzle–flapper valves

Effects of flow force on the characteristics of electrohydraulic servovalves

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