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Vane pumps can be divided into unbalanced balanced vane pumps and vane pumps.

Typically a circular rotor eccentricity vane pump be installed on another circular holes, when the rotor is rotated in the pump blade for extended contraction movements, oil pressure at the inlet side are drawn and sent to the outlet side. Vane pump small size, low price.

General categories, fixed displacement and variable displacement type, fixed displacement are mostly balanced vane pump, variable-displacement or imbalance, fixed displacement type, type can be divided into single-stage vane pump with variable displacement vane pump of the second.

Fixed displacement vane pump rotor rotation for a week, its theoretical throughput for certain.

When the pressure exceeds the set value, the excess oil must flow through the drain valve back into the fuel tank to hydraulic energy, resulting in loss of energy. Variable displacement vane pump type will rectify its shortcomings.