NHGH series circular arc gear pump is suitable for conveying no solid particles and fibers, the temperature is not higher than 120℃, in the oil transmission system can be used as a transmission, booster pump; In the fuel system can be used as conveying, pressurizing, injection fuel transfer pump; In the hydraulic transmission system can be used as hydraulic pump to provide hydraulic power; In all industrial fields, it can be used as lubricating oil pump and lubricating oil conveying pump.