Oval gear flow meter is a light volumetric flow meter with pointer display, word wheel accumulation counting device and zero return device. It is widely used in liquid flow control in various industrial fields and is suitable for various types of liquid measurement, such as crude oil and diesel oil. , gasoline, etc., it has the characteristics of large measuring range, high precision, easy use and maintenance, and uses different manufacturing materials to meet the requirements of liquid flow measurement in various fields such as petroleum, chemical industry, medicine, food, metallurgy, electric power, transportation, etc.