The paper investigates instable behavior of a poppet-type gas pressure relief valve operating at a big flow rate (more than 2 kg/s) under super critical pressure drop. Instability is experienced as noise and vibration and leads to severe damage of a seat and other elements. Significant and unsteady flow forces coupled with small inherent damping make it difficult to stabilize the system. In previous works, the analytical and experimental research was carried out to reveal the most essential factors influencing stability and dynamic properties of the valve. The impact of the pilot valve dynamics on the system behavior was studied for the purpose of obtaining required accuracy and stability in a wide range of flow rate. It was shown in some testing that unstable behavior of the main valve occurred when the pilot valve was stable. This paper considers inherent stability of the main valve in the gas flow. CFD software ANSYS FLUENT is employed to study the effect of the poppet geometry on aerodynamic lifting force and valve stability in axial and lateral direction. The results have been verified through comparison with experimental data.
The noise in natural gas distribution systems is mainly caused by pressure reduction in shut-off and control valves. The aim of present research is to analyze dynamics of an air pressure reducing valve with a muffler installed at its output. An increase of output impedance can lead to a loss in stability and control accuracy. Therefore, the valve simulation model in software package MATLAB/Simulink is developed in order to study the muffler’s impact on static and dynamic performances of the pressure reducing valve. As a result of performed modeling and simulation the influence of the output throttle resistance on the system main operating parameters is obtained. The output data can be used to optimize sizing of the muffler for the air pressure reducing valve.
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