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* '''Rotary-type''' positive displacement: internal gear, screw, shuttle block, flexible vane or sliding vane, circumferential piston, helical twisted roots (e.g. the Wendelkolben pump) or powder ring vacuum pumps. | * '''Rotary-type''' positive displacement: internal gear, screw, shuttle block, flexible vane or sliding vane, circumferential piston, helical twisted roots (e.g. the Wendelkolben pump) or powder ring vacuum pumps. | ||
* '''Reciprocating-type''' positive displacement: piston or diaphragm pumps. | * '''Reciprocating-type''' positive displacement: piston or diaphragm pumps. | ||
* '''Linear-type''' positive displacement: | * '''Linear-type''' positive displacement: rope pumps and chain pumps. | ||
===== Rotary Positive Displacement Pumps ===== | ===== Rotary Positive Displacement Pumps ===== |