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1, Overview 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. 2, the working principle Electric or hydraulic flapper valve is usually used with metal seal butterfly valve. 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. 3, Failure Analysis Valve plate transverse movement by the valve plate travel agencies drive the lower part of the sprocket drive pin to achieve. Electric plate valve factory debugging, the valve plate action in place, adjust the travel limit of the electric device to ensure that the electric device stops running at the same time limit device to achieve the valve limit. Hydraulic flapper valve factory debugging, the valve plate in place, adjust the valve plate in place of the travel switch to ensure that the hydraulic motor to stop driving at the same time limiting device to achieve the limit valve plate. But the valve in the course of use, sometimes there is a delay switch or failure of the phenomenon. After field analysis confirmed that due to the error of the electric device counter and inertia collision of moving parts and other reasons, resulting in the signal transmitted by the travel switch lag or failure, resulting in electric device or hydraulic motor overload continue to run, damage to the valve plate travel mechanism shaft or Coupling, resulting in the operation of blast furnace gas and its system. 4, improvement measures Pin rack safety device is the use of cogwheel and drive pin meshing operation in place, the drive pin shaft promptly from the cogwheel, the cogwheel idling, do not drive rack to walk to achieve its safety features, the safety device Does not prevent the cogwheel in the opposite direction of operation. Pin rack safety devices usually use the chute and pin-type structure. The pin rack safety device is arranged at the two extreme positions of the transverse movement of the valve plate and ensures the safety of the transmission components of the running mechanism of the valve plate through the idling of the cogwheel from the pin rack. Sliding safety device structure is simple, commonly used in open flapper valve. The movable pin safety device is suitable for the enclosed flapper valve. The diameter of the movable pin hole is appropriately increased during design and is matched with the movable pin auxiliary return spring to ensure that the valve plate traverses normally. 5 Conclusion Pin rack safety device application to solve the delay or failure of the trip valve transmission parts damage, to ensure the blast furnace gas process.