What is the use of fixed displacement gear pumps

Fixed displacement gear pumps are the most common hydraulic component. Fixed displacement gear pumps deliver the reliable hydraulics performance today’s manufacturers demand.
What is the use of fixed displacement gear pumps
Depending on the number of teeth, the fixed displacement gear pump might be driven directly by the “drive” gear. The teeth on fixed displacement gear pumps can be straight,helical slanted, herringbone, etc. gear pump models and variations, all exhibiting different effects on the efficiency, strength, smoothness and other areas of hydraulics system operation. 
The specialist for melt pump for extruder assisted extrusion for thermoforming-sheets, films, pipes, profiles and recycling and exctruder or loss in weight feeder in the plastic industry with screen changers.

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