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Electric or hydraulic flapper valve (also known as the glass valve) is one of the main cut-off equipment for blast furnace gas pipe network. The device is widely used in the metallurgical industry and is the key cut-off for blast furnace gas removal systems and blast furnace gas residual pressure power generation (TRT) systems. How it works Electric or hydraulic poppet valves are commonly used with metal seal butterfly valves. Take the closed-type hydraulic plug-in valve as an example, the opening and closing of the valve is composed of a valve seat top opening mechanism (hydraulic cylinder) and a valve plate running mechanism (hydraulic motor), and the valve plate is respectively provided with a through hole seat and a blind hole seat. The valve plate through-hole seat and the blind hole seat to switch from the top open (release valve plate) → → → plate clamping plate clamping (seal sealing plate) to achieve several actions, thus enabling the valve opening and closing. Electric flapper valve seat top open institutions and the valve plate travel agencies are driven by the electric device.