Buried flange hard seal butterfly valve refers to the transmission rod of the switch valve located directly above the worm gear box. Butterfly valves do not require lateral installation and can be manually opened and closed on the ground using a dedicated operating rod.
The upper opening buried flange hard seal butterfly valve 
is mainly made of stainless steel or carbon steel, and the valve core structure can adopt double eccentric or triple eccentric structure. Mainly used for underground water supply pipelines, it can prevent moisture and corrosion.