Shaped rotor 1 rotates about fixed axis A, eccentrically located with respect to the geometric axis of housing 2. Vanes 3 and 4 turn about axes B. When the rotor rotates, vanes 3 and 4 are held against the housing by centrifugal force. In the position shown, liquid is drawn in from suction input b, while discharge output e is closed by vane 4. The action of the vanes alternates.
$3791$LHP,RP$