FIELD: transfer of liquid phase biologically harmful, toxic, radioactive and aggressive products. SUBSTANCE: pump has working chamber with cover and suction valve in lower part of chamber enclosed in perforated box connected through rod with flange. Impulse branch pipe is located on cover. Pressure valve is arranged in upper part of perforated box which is placed in pressure branch pipe in zone of pressure valve with sealing over side surface. Pressure branch pipe at its outlet from working chamber is connected to blind branch pipe with fitted on regulator. Perforation holes are made on upper end face of box. Ratio of area of section of blind branch pipe to area of section of pressure branch pipe lies within 3 and 4. Regulator is made in form of union. Sealing is installed with slide fit. EFFECT: increased capacity and improved reliability of pump, reduced operating expenses. 4 cl, 1 dwg
