FIELD: transfer of aggressive liquids. SUBSTANCE: casing accommodates a membrane separator forming the pump and drive chambers. The sealed casing chamber accommodates a cylinder with a spring-loaded plunger and electromagnetic drive. Another membrane separator and cover make up a compensation chamber and external medium chamber. The casing has axial holes used to communicate the cylinder with the drive and compensation chambers. The cover has an axial hole used to communicate the external medium chamber with the external medium source. EFFECT: improved design. 7 cl, 2 dwg
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