Rotary valve gas switching and distributing device for diaphragm gas meter

A rotary valve gas switching and distributing device for a diaphragm gas meter belongs to the technical field of metering instruments and comprises a valve cover and a valve seat. The valve seat comprises a shaft seat ring and an outer annular barrier, and the outer annular barrier and the shaft seat ring are connected through a plurality of inclined partition ribs to divide a plurality of valve seat air inlets. And the valve cover is arranged on the central shaft of the shaft seat ring. And the valve cover air inlet is matched and corresponds to the valve seat air inlet. A valve cover notch is formed in the valve cover air inlet advance angle. In the rotating process of the valve cover, dust and/or impurities can slide to the lower edge of the inclined face of the inclined partition rib along with rotation of the valve cover, the valve cover notch is formed, and when the volume of a cavity below the air inlet of the valve cover is about to reach the maximum value, the valve cover notch can guide airflow to v