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Flow characteristics of pressure reducing valve with radial slit structure for low noise

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Abstract

Pressure reducing valves are widely used to maintain the pressure of gas reservoirs to specific values. In a normal valve, supply pressure is decompressed with an orifice structure. When compressed air passes through the orifice structure, considerable noise occurs at the downstream side. In this paper, we have developed a radial slit structure that can reduce pressure without noise. The noise is reduced by changing the orifice structure into the radial slit structure. The radial slit structure valve reduces pressure without noise by suppressing the generation of turbulence and shock wave at the downstream. The analysis of the flow in radial slit structure was achieved by CFD2000 software. The flow rate and pressure distribution were simulated and compared with the experimental result. To confirm the generation of shock wave, the flow of orifice and radial slit structure at the downstream was visualized by Schlieren photography method. A shock wave was generated in the orifice structure, but no shock wave was generated in the radial slit structure. Noise reduction efficiency was investigated by the experiment. The experiment apparatus was set up to JIS standards. The experimental results indicated that the noise level decreased by approximately 40 dB in the slit structure. It is confirmed that the radial slit structure has effectiveness for low noise in the pressure reducing flow. And, it is expected that it can be applied to various kinds of industrial fields.

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Abbreviations

h :

Height of slit [μm]

P :

Pressure [Pa(abs)]

P s :

Supply Pressure [Pa(abs)]

Q :

Volume flow rate [l/min normal]

r :

Radial direction [m]

R o :

Gas constant [J/kg·K]

SPL :

Sound pressure level [dB(A)]

u :

Velocity [m/s]

T :

Temperature [K]

ρ:

Density [kg/m3]

ξ:

Inlet loss

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Correspondence to Youn C..

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Chongho Youn: Born in March 1973. Received his master degrees in Mechanical Engineering from Chonnam National University (Korea) in 1999. Received his Ph. D degree from the Tokyo Institute of Technology (Japan) in 2005. He was working as an assistant professor at the Precision and Intelligence Laboratory of this institute. His primary research interests are fluid measurement control and visualization.

Seiichiro Asano: Born in September 1979. Received his M.Sc degree from the Tokyo Institute of Technology in Japan. He was a PhD student in the civil engineering course.

Kenji Kawashima: Born in July 1968. Received his Ph. D degree from the Tokyo Institute of Technology (Japan) in 1997. He was working as an associate professor at the Precision and Intelligence Laboratory of this institute. His primary research interests are fluid measurement and control, robot engineering. Toshiharu Kagawa: Born in November 1950. Received his M. Sc and Ph. D degree from the Tokyo Institute of Technology in Japan. He was working as a professor at the Precision and Intelligence Laboratory of this institute. His primary research interests are pneumatics, fluid measurement and control.

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Youn, C., Asano, S., Kawashima, K. et al. Flow characteristics of pressure reducing valve with radial slit structure for low noise. J Vis 11, 357–364 (2008). https://doi.org/10.1007/BF03182204

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  • DOI: https://doi.org/10.1007/BF03182204

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