Circular rotor 1 rotates about fixed axis A and has four symmetrically arranged ports a. Piston 3 reciprocates in cylinder b of rotor 1. Piston 3 has cylinder d sliding along pbiston 2 which rotates about fixed axis B. When rotor 1 rotates, pistons 2 and 3 deliver liquid in the direction of the arrows.
$3826$LHP,RP$