A double gear pump is a gear pump consisting of two sets of gears, including a pair of gears that mesh with each other and work together on the same drive shaft

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duplex gear pump

duplex gear pump 0.8 to 30 cubic centimeters per revolution

duplex pump

duplex pump with two independent gear pumps in one pump body

tandem gear pump

tandem gear pump 1.4 to 13 cubic centimeters per revolution