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The working principle of a bidirectional gear pump:
A pair of meshing gears and pump cylinders separate the suction and discharge chambers. When the gear rotates, the volume between the teeth at the separation point of the suction chamber side teeth gradually increases, the pressure decreases, and the liquid enters the teeth under the pressure difference. As the gears rotate, the liquid between each tooth is carried to the discharge chamber. At this point, the volume between the teeth at the meshing point of the gear teeth on the discharge chamber gradually decreases, and the liquid is discharged. Gear pumps are suitable for conveying lubricating liquids that do not contain solid particles, are non corrosive, and have a wide viscosity range. The flow rate of the pump can reach 300 m3/h, and the pressure can reach 3 × 107 Pa. It is usually used as a hydraulic pump and to transport various types of oil products.