Pressure at the inlet to a device or a system (DIN 24 312). Self-priming pumps generate a negative pressure during priming if the fluid feed height is not positive. Min. and max. inlet pressure are dependent on the type of pump. On hydrostatic displacement units the min. inlet pressure is, as a rule, limited by the occurrence of cavitation and the max. inlet pressure by the resistance of the shaft sealing ring or the housing to pressure.
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