Rotor 1 rotates about fixed axis A, eccentrically located with respect to the geometric axis of housing 2. Rotor 1 has four slots a in which vanes 3 slide. Springs 4 hold the vanes constantly against the internal surface of housing 2. When rotor 1 rotates, vanes 3 deliver liquid in the direction of the arrows.
$3802$LHP,RP$