Gear metering valve is the preferred equipment for high-speed continuous variable glue dispensing. The gear metering valve has the advantages of continuous dispensing and stable dispensing speed. Gear metering valves also provide rotating needles to handle complex 2D/3D contours. In addition, to ensure perfect performance and excellent results, the gear metering valve is equipped with a precision position feedback servo motor, lubricant observation window, and pressure monitoring and pressure release device