Gas distribution system layout effecting tightness of the long-stroke low-speed piston compressor stages at low, medium and high pressures

The paper considers working processes and integral characteristics of the air long-stroke low-speed piston compressor stages at the atmospheric suction pressure, as well as at low, medium and high discharge pressures. Comparison objects include a stage with the self-acting valves of standard arrangement and a stage with the suction valve positioned on the cylinder wall at considerable distance from its cover. Indicated efficiency coefficient, delivery coefficient and discharge temperature are the integral parameters. The paper analyzes also such independent parameters as the working gas state at suction, discharge pressure, main stage dimensions and parameters, distance from the suction valve to the top dead center and seat diameters of the suction and discharge valves. The considered stage working process efficiency is comparatively analyzed with various positions of the suction valves in the working chamber. The paper indicated methodology for computing the working process of a low-speed long-stroke stage in terms of determining the working gas leaks through the suction valve taking into account its design features. It analyzes relationship between intensity of the working gas mass flow through leaks in the stage working chamber and design features of the gas distribution system in terms of the suction valves arrangement in the working chamber, their seats diameter and the applied structural materials. Results of the theoretical analysis reflect the nature of the stage integral characteristics dependence on the suction valves positioning in the working chamber at low, medium and high discharge pressures.
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