Gear pump with the international advanced level of 90 years of new technology - double arc sinusoidal tooth-shaped arc. Compared with the involute gear, the most outstanding advantage is that there is no relative sliding of the tooth profile during gear meshing, so there is no wear on the tooth surface, balanced operation, no sleepy liquid phenomenon, low noise, long service life and high efficiency. The pump to get rid of the shackles of the traditional design, making the gear pump in the design, production and use into a new field. Gear pump with a differential pressure relief valve as overload protection, safety valve full back pressure of the pump rated discharge pressure 1.5 times. Can also be allowed to discharge pressure within the scope of the actual need to be adjusted. However, the safety valve can not be used as a long-term work of the valve, if necessary, can be installed separately in the pipeline. The gear pump shaft seal designed in two forms, one is a mechanical seal, and the other is a packing seal, according to the specific use and user requirements identified.