Circular eccentric 1 rotates about fixed axis A, coinciding with the geometric axis of housing 4. Eccentric 1 is encircled by collar 2 which slides along the internal surface of housing 4. Collar 2 is connected by turning pair B to abutment member 3 which separates the suction and discharge chambers and oscillates about fixed axis C. Member 3 has liquid input channel a and discharge channel b. When eccentric 1 rotates, liquid is delivered from channel a to channel b.
$3835$LHP,RP$