FIELD: mineral mining from large depths; applicable in recovery of viscous oil with large sand production and in underwater mining of loose materials. SUBSTANCE: device has cylinder connected with pipe string and hollow piston connected with rod string by means of stem. Hollow piston has channel with funnel-shaped section widening towards intake end. Installed in piston channel is shutoff valve and cylinder upper part has partition closed by pressure valve. Located between said valves is closed space whose volume varies in the course of operation. EFFECT: provision of lifting minerals to surface without additional appliances. 1 dwg
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