FIELD: oil producing industry; pumping of viscous emulsions and gas-liquid mixtures. SUBSTANCE: pump has fixed cylinder and plunger and delivery valve. Upper suction valve is installed on plunger including upper and lower pistons connected by branch pipe with ports for taking in crude oil and with through channel for passing of fluid. Upper and lower pistons are interconnected non-rigidly. Lower piston can reciprocate relative to upper piston. EFFECT: possibility of use of sucker-rod pumps of large diameter for transfer of emulsified oil and gas-liquid mixtures in large amounts. 1 dwg
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