A composite pump body has a main body with suction and discharge pipes and a cover with surfaces connected to the main body. The main body and the covers has common hydraulic cavity with semi-spiral supply and spiral discharge with double-turn spiral. The hydraulic cavity with semi-spiral supply and spiral discharge with double-turn spiral is formed by inner surface of covers together with the inner surface of the main body and the outer surface of the cowls. All conjugated surfaces are made as ring-like and are placed normally with respect to the long axis of the body of the pump. Cylindrical conjugated surfaces have seats. The flow-through section is made as split and has two cowls installed at both sides of spiral discharge, at that the main body if closed with covers from two sides.
