The gear-type oil pump is used for conveying a variety of oils, such as heavy oil, diesel oil, lubricating oil, crude oil etc., equipped with copper gears and explosion-proof motors can transport low flash point liquid gasoline, benzene and so on. Stainless steel pump is used for the food industry conveyor beverages, edible oil, milk, the pH of the liquid. The pump does not apply for solid particles and fibers liquid for viscosity of 5 × 10-5 ~ 1.5 × 10-3m2 / S. The medium temperature is not higher than 70 ℃. For transporting hot liquids, use a high-temperature gear pump, can transport liquid below 300 ℃.