Circular rotor 1 rotates about fixed axis A, eccentrically located with respect to the geometric axis of housing 2. Four vanes 3 rotate about fixed axis B, coinciding with the geometric axis of housing 2. Links 4 are connected by turning pairs C and D to vanes 3 and rotor 1. When rotor 1 rotates, liquid is delivered in the direction of the arrows.
$3794$LHP,RP$