Vane pump having a hydraulic resistance element
Vane pump having a pressure plate which is concave when unloaded
Vane pump having an abradable coating on the rotor
Vane pump having an intake groove through a side wall member
Vane pump with improved internal port placement
Vane pump with positioning pins for cam ring
Vane pump with positioning pins for cam ring and side plates
Vane pump with pressure chambers at the outlet to reduce noise
Vane type positive displacement pump having multiple pump units
Vane type rotary device