Positive displacement pumps delivers a certain amount of fluid every revolution/stroke. Fluid will not slip due to very less clearances between suction and discharge parts.
Most common type of positive displacement pumps are:
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rotary lobe pump
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progressing cavity pump
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rotary gear pump
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piston pump
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diaphragm pump
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screw pump
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gear pump
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vane pump
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regenerative (peripheral) pump
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peristaltic pump
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