FIELD: engines and pumps.
SUBSTANCE: piston assembly comprises, at least, one piston with tubular membrane extending along the axis to confine, at least, one inner pulsating working chamber. Said pumps or engines are intended for use with fluid bearing foreign matters (particles), particularly, abrasive granular materials. For this required are machines running at high speed and pressure of several hundreds to several thousands of bars. Here, of special importance are power transfer factor and cubical capacity factor. For this, proposed piston assembly incorporates one dead space displacer TK1 is arranged engaged with pulsating working chamber AR.
EFFECT: higher efficiency, longer life.
8 cl
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