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positive displacement pump can be classified to
1-rotary pump
2- reciprocating pump
type of rotary pump
1-lobe pump
2-screw pump
reciprocating pump
1-piston pump
2-plunger pump
3-diaphram pump
Mr. Tariq Jilani has the closest answer. Equal volume per cycle in is the same as the volume out. This applies to plunger pumps, rotary pumps (gear, lobe, screw), plunger pumps. diaphram pumps, peristaltic pumps, just to name a few. These types of pumps should always be operated with a pressure relief device in the system for safety!