Circular rotor 1 rotates about eccentrically located fixed axis A, coinciding with the geometric axis of housing 3. Rotor 1 contacts the internal surface of housing 3. When rotor 1 rotates, liquid is delivered from the suction to the discharge chambers which are separated by three hinged abutments 2. The abutments turn about fixed axes B and are constantly held against the rotor by springs (not shown).
$3789$LHP,RP$