Pump is the drainage and back into the groove of reasonable design, is a gear in the work under the minimum torque force, so the bearing load is small, wear small, pump with high efficiency.

The rings (for materials see Table 6.1) are heat-treated in different ways according to the strain on the gear rings and the contact pressure of the area carrying the highest load.

If the first gear pump operation, or long-term idle after use, preferably in small load or no-load circumstances Xianpao One hour.