The LZY series weir type flow sight glass is a type of pipeline sight glass. This series of products is connected to the pipeline using flanges and installed horizontally in the pipeline. It mainly consists of connecting flanges, glass mirrors, main body, cover flanges and other components. It is mainly used in mechanical lubrication systems or pipeline equipment in the fields of petroleum, chemical, power, metallurgy, medicine, etc. When there is fluid passing through the pipeline, the flow rate of the fluid in the pipeline can be macroscopically observed, and temperature can be measured and a liquid level transmitter can be installed. It is an essential product in pipeline equipment.