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    Micro-self-priming pump: A micro-pump with self-priming ability, which can absorb water without adding water. The principle is to use the negative pressure (vacuum) formed when the pump works, under the action of atmospheric pressure will be lower than the water pressure of the pumping port. Such as the micro self-priming pump SC3721PW, its self-priming height can reach 2 meters.
    Micro submersible pump: also known as micro bilge pump, belongs to a kind of pump. It can transmit the mechanical energy or other external energy of the prime mover to the liquid, so that the liquid energy is increased, and it is mainly used for transporting water, oil, acid lye and other liquids.
    Iii. Characteristics
    Small size: The miniature pump is small in size and easy to carry and install.
    Low noise: The noise of some micro-pumps can be as low as 50dB or less, which is suitable for occasions where a quiet environment is needed.
    Low power consumption: The micro-pump has low power consumption and saves energy.
    Long life: part of the motor and circuit board of the micro-pump are potting with epoxy resin and are completely isolated from the rotor, which can greatly improve its service life.