The electric pre-supply oil pump is divided into two forms: DC and AC, mainly used for pre-supplying oil before starting a diesel engine; the oil outlet of the pre-supply pump is equipped with a check valve, and the connection forms of its inlet and outlet oil holes are customized according to the different needs of the engine manufacturer; in addition, the DC motor is divided into single-wire and double-wire systems, and users can choose according to specific circumstances.
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