Chapter 3 Hydraulic Pumps 3.1.4 Classification Hydraulic pumps may be classified by the forms of main moving components and their moving manners:gear,vane,piston and screw pumps 1)Gear pumps may be further classified in two broad categories,external or internal mesh; 2)Vane pumps may be further divided into double-acting vane pumps,single- acting vane pumps and cam-rotor vane pumps; 3)Piston pumps consist of radial piston pumps and axial piston pumps; 4)Screw pumps include single-screw pumps,two-screw pumps and three-screw pumps. Hydraulic pumps may be further classified according to the types of delivery (1)Fixed delivery; (2)Variable delivery. variable delivery can be accomplished in single-acting vane pumps,radial or axial piston pumps 11 Homepage List Upwards Downwards Retumn Exit Chapter 3 Hydraulic Pumps 11 3.1.4 Classification Hydraulic pumps may be classified by the forms of main moving components and their moving manners: gear, vane, piston and screw pumps. 1)Gear pumps may be further classified in two broad categories, external or internal mesh; 2)Vane pumps may be further divided into double-acting vane pumps, single￾acting vane pumps and cam-rotor vane pumps; 3)Piston pumps consist of radial piston pumps and axial piston pumps; 4)Screw pumps include single-screw pumps, two-screw pumps and three-screw pumps. Hydraulic pumps may be further classified according to the types of delivery: (1) Fixed delivery; (2) Variable delivery. variable delivery can be accomplished in single-acting vane pumps, radial or axial piston pumps