Electric or hydraulic flapper valve (also called the glasses valve) is a blast furnace gas pipe network one of the main cutting device. The device is widely used in metallurgical industry, blast furnace gas and blast furnace gas dust removal system residual pressure power generation (TRT) system is the key cutting equipment.
Working principle
Electric or hydraulic usually associated with supporting the use of metal sealing butterfly valve plate valve plug. The closed hydraulic flapper valve for example (Figure 1), open and close the valve seat to open the top body (hydraulic cylinder) and the valve plate running gear (hydraulic motor) is composed of two parts, valve plate are respectively arranged through hole and blind hole seat. The valve plate hole and blind hole seat of the switch from the top open (release valve), valve plate sliding and clamping (valve plate sealing sealing), several actions to complete, open and close the valve. Electric flapper valve seat to open the top institutions and the valve plate running gear driven by the electric device.
Fig. 1 closed hydraulic flapper valve
The 1 limiting device 2 valve plate indicating device 3 vice valve main valve seat to open the top 4 5 6 7 8 valve plate transmission pin valve plate running gear coupling 10 motor 9
Fault analysis
Transmission pin valve plate sliding movement by the valve plate running gear sprocket drive the lower valve plate to achieve. Electric flapper valve factory debugging, the valve plate moves in place, adjust the travel limit switch electrical device, so as to ensure the electric device stops functioning at the same time limit device to achieve the limit valve plate. Hydraulic flapper valve factory debugging, the valve plate moves in place, adjust the valve plate in place of the trip switch, to ensure that a hydraulic motor to drive the limit device to stop the valve plate. But the valve during use, sometimes there travel switch delay or failure phenomenon.
After on-site analysis confirmed that, due to inertia collision reasons regulating electric device error counter and moving parts, resulting in the signals travel switch delay or failure, resulting in electric or hydraulic motor overload devices continue to operate, damage to the valve plate running gear transmission shaft or coupling, caused the accident of blast furnace gas and its system.
Improvement measures
Pin rack safety device is the use of blunt gear meshing with the drive pin in place after the operation, the drive pin in a timely manner from the cogwheel, cogwheel idle, do not drive rack frame to walk to achieve its security features, the security device does not prevent the blunt running gear in the opposite direction. Pin rack safety device commonly used chute (Figure 2) and activities of the pin (Fig. 3) structure. Pin rack safety device is arranged in the two extreme position of valve plate sliding movement, racing through the cogwheel from the sale rack to ensure the valve plate running gear of the transmission part of the safety. Chute safety device of simple structure, commonly used in open-type flapper valve. The movable pin type safety device suitable for closed type board plug valve, appropriate to increase the activity of pin hole diameter in the design, and with a movable pin auxiliary return spring, ensure the normal valve plate sliding action.
Conclusion
Application of pin rack safety device solves the travel switch delay or failure of the valve damage drive components, to ensure the normal operation of blast furnace gas process system.
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