Connecting Rod Butterfly Valve Plate Optimization: Key Technology to Extend Hot Blast Stove System Valve Service Life
Connecting Rod Butterfly Valve Plate Optimization: Key Technology to Extend Hot Blast Stove System Valve Service Life
The connecting rod butterfly valve is a critical component widely used in metallurgical blast furnace hot blast stove systems, primarily serving pipelines that transport air, gas, and flue gas media. Known for its compact structure, light weight, flexible operation, and easy maintenance, this valve plays an essential role in industrial pipeline applications. Among its components, the valve plate is particularly important, as its structural design directly impacts the overall service life and operational reliability of the valve.The main Butterfly Valve product names of China Butterfly Valve Network include:Valve Plate Optimization,Connecting Rod Butterfly Valve,Hot Blast Stove System,Structural Deformation,Finite Element Analysis,Service Life Extension,Welded Valve Plate Structure,Industrial Valve Reliability.
Structural Features and Importance of the Valve Plate
The connecting rod butterfly valve is mainly composed of a driving device, valve plate, valve body, main shaft, and linkage mechanism. During operation, the driving device rotates the main shaft, which moves the linkage mechanism to open or close the valve plate. Whether the valve is open or closed, the valve plate and its connecting components remain immersed in the medium. When the valve is closed, the valve plate bears the full pressure of the medium, which can lead to plastic deformation and subsequent damage to the linkage system. When the valve is open, the valve plate is exposed to medium erosion and flow-induced vibration, accelerating wear on connecting parts, especially the solid self-lubricating bearings at the hinge points. Therefore, the service life of the valve plate directly determines the service life of the entire connecting rod butterfly valve.
Analysis of the Traditional Valve Plate Structure
Traditionally, the valve plate of the connecting rod butterfly valve is manufactured using a welded structure rather than casting. It consists of three parts: vertical plates, backing plates, and a large circular steel plate. While the vertical and backing plates can be directly cut to size, the large circular steel plate requires a forming die to achieve the required arc shape. The plate is pressed into shape using the die, then welded to the vertical plates, and finally machined. Since the center of the valve plate is curved while the edges are flat, a dedicated die is required for each valve specification, significantly increasing manufacturing costs.
Finite Element Analysis and Optimization Insights
Finite element analysis of the traditional valve plate structure under 0.4 MPa pressure reveals that the maximum deformation occurs at the two vertical plates, reaching 1.69 mm. This deformation severely damages the connecting pin shaft and bearings. Field evidence from a DN1700 cold air valve operating under 0.47 MPa and 350°C in a hot blast stove cold air pipeline confirms this finding, showing a bent pin shaft and a completely crushed self-lubricating bearing.
Optimizing the valve plate structure to minimize deformation is essential to extending the service life of connecting rod butterfly valves, reducing maintenance costs, and improving overall equipment reliability.
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