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Well piston-diaphragm pump has filled with hydro-protective liquid cylinder with ram placed into it, with rod, connected to drive element, sealing device of the rod, compensation chamber with separating diaphragm, suction-supercharge chamber with suction and supercharge valves and separating diaphragm,. To increase reliability and durability of the pump suction-supercharge chamber is connected to the end of the cylinder and compensation chamber is placed between the ram and sealing unit of the rod that goes through compensation chamber.