Circular rotor 1 rotates about fixed axis B, eccentrically located with respect to the geometric axis of housing 3. Rotor 1 has six symmetrically arranged cylinders 5 in which pistons 2 reciprocate. Pistons 2 have rollers 4 which roll and slide in circular slot b having its centre at axis A of housing 3. When rotor 1 rotates, the upper cylinders draw in liquid through suction input channel a and the lower cylinders deliver the liquid through discharge output channel d.
$3822$LHP,RP$