DYNAMIC BEHAVIOR OF NON - RETURN VALVES OPERATING AT SMALL OPENING
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Abstract
In the present work a general dynamic behavior of non return valves subjected to jet flow is presented. The differential equations of valve motion and discharge were developed in a non-dimensional from, in terms of suitable dimensionless variables and parameters of the valve system.
The derived equations are coupled nonlinear differential equations. Thus, a computer program was developed using a package called (MatLab) to solve these equations. The study shows that there are three types of the valve responses depending on the overall hydrostatic pressure difference and it is found that the valve vibrating at a constant limit cycle, which is leading to the failure of the system. It is also shown that the limit cycle frequency decreases with increasing the stiffness parameter and inertia factor. Finally the study shows that the losses factor has negligible effect on valve vibration and discharge.
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References
J. W. Hutchison “ISA Handbook of Control Valves” Second Edition U.S.A, 1976.
T. Siikonen “Computational Method for the Analysis of the Valve Transients” Journal of the Pressure Vessel Technology. August 1983. Vol. 105, pp. 227-233.
Renold S. Kone and Soung M. Cho “Hydraulic Performance of Titling-Desk Check Valves” Journal of the Hydraulics Division, Proceedings of the American society of Civil Engineering, Vol. 102, No.hy1, January, 1976. pp 57-71.
J. Kubie “Performance and Design of Plug-Type Check Valves” Engineering Sciences Division 1982 Vo. 196 pp. 47-56.
D.S. Weaver and F. A. Dubi, “Flow Induced Vibrations of a Hydraulic Valve and Their Elimination”, ASME J .of Fluids Engineering, Vol 100 1978, pp 239-145.
D.S. Weaver and S. Ziada “A Theoretical Model for Self-Excited Vibrations in Hydraulic Gates, Valves and Seals” Transactions of the ASME. May 1980. Vol.102, pp 146-151.
Weaver, D.S., Ziada, “Flow Visualization Studies of Check Valve Vibrations” Proc. 4th Biennial Symposium on Turbulence in Liquids, Science Press, Princeton, N.J., 1975, PP.201-208.
Joun A. Robenson and Clayton T. Crowe “Engineering Fluid Mechanics” Fourth edition U.S.A, 1990.
J. W. Daily “Resistance Coefficient for Accelerated and Decelerated Flows through Small Tubes and Orifice”. Transaction of the ASME, Vol. 78, pp 1071-1077.
D.McCloy “Effects of Fluid Inertia and Compressibility on the Performance of Valves and Flow Meters Operating under Unsteady Conditions”. Mechanical engineering science, Vol. 8, No.7, pp 52-61.
J. W. Hutchison “ISA Handbook of Control Valves” Second Edition U.S.A, 1976.
T. Siikonen “Computational Method for the Analysis of the Valve Transients” Journal of the Pressure Vessel Technology. August 1983. Vol. 105, pp. 227-233.
Renold S. Kone and Soung M. Cho “Hydraulic Performance of Titling-Desk Check Valves” Journal of the Hydraulics Division, Proceedings of the American society of Civil Engineering, Vol. 102, No.hy1, January, 1976. pp 57-71.
J. Kubie “Performance and Design of Plug-Type Check Valves” Engineering Sciences Division 1982 Vo. 196 pp. 47-56.
D.S. Weaver and F. A. Dubi, “Flow Induced Vibrations of a Hydraulic Valve and Their Elimination”, ASME J .of Fluids Engineering, Vol 100 1978, pp 239-145.
D.S. Weaver and S. Ziada “A Theoretical Model for Self-Excited Vibrations in Hydraulic Gates, Valves and Seals” Transactions of the ASME. May 1980. Vol.102, pp 146-151.
Weaver, D.S., Ziada, “Flow Visualization Studies of Check Valve Vibrations” Proc. 4th Biennial Symposium on Turbulence in Liquids, Science Press, Princeton, N.J., 1975, PP.201-208.
Joun A. Robenson and Clayton T. Crowe “Engineering Fluid Mechanics” Fourth edition U.S.A, 1990.
J. W. Daily “Resistance Coefficient for Accelerated and Decelerated Flows through Small Tubes and Orifice”. Transaction of the ASME, Vol. 78, pp 1071-1077.
D.McCloy “Effects of Fluid Inertia and Compressibility on the Performance of Valves and Flow Meters Operating under Unsteady Conditions”. Mechanical engineering science, Vol. 8, No.7, pp 52-61.