Key Technical Points And Application Practices Of Butterfly Valve Methods

Butterfly valves, as essential fluid control devices, are widely used in industries such as petrochemicals, power generation, and water treatment for their simple structure, convenient operation, and high cost-effectiveness. Mastering the correct butterfly valve method not only improves system efficiency, but also extends equipment life and reduces maintenance costs.
The core operating methods of butterfly valves include on-off control and flow regulation. During on-off operation, precise valve rotation is crucial. Generally, fully open or fully closed positions correspond to 90-degree rotations. Avoid applying excessive force during operation to prevent damage to the sealing surface. For flow regulation, butterfly valves can be partially opened to achieve flow control. However, care should be taken to avoid prolonged operation at a small opening, as this can cause fluid erosion of the sealing surface and affect valve performance.
The installation method is fundamental to ensuring the long-term and stable operation of butterfly valves. Before installation, check that the valve model matches the pipeline specifications and confirm that the flow direction of the medium aligns with the arrow on the valve. It is recommended that butterfly valves be installed on horizontal pipelines. If vertical installation is necessary, consider the impact of the medium's gravity on sealing performance. When connecting flanges, bolts should be tightened symmetrically to avoid uneven force and leakage. When welding connections, protective measures must be taken to prevent high temperatures from damaging the valve body seal.
Maintenance is key to extending the life of butterfly valves. Regularly inspect the valve stem seal for wear and promptly replace aged or damaged O-rings. For valves that have been out of service for extended periods, it is recommended to apply anti-rust grease to the sealing surface and manually rotate the valve disc regularly to prevent sticking. If an abnormal increase in opening and closing torque is observed during operation, this may indicate foreign matter or wear on the sealing surface and require prompt disassembly and inspection.
Butterfly valve selection requires comprehensive consideration of operating conditions. Select the appropriate valve body material, such as cast iron, stainless steel, or engineering plastic, based on the media's temperature, pressure, and corrosiveness. Metal-sealed butterfly valves can be used for demanding applications, while rubber seals are sufficient for more general applications. Furthermore, the choice of actuation method is crucial. Electric or pneumatic actuators are suitable for remote control, while manual operation is more economical and reliable.
Mastering scientific butterfly valve techniques and meticulously controlling the entire process, from installation to operation to maintenance, is crucial for ensuring the safe and efficient operation of fluid systems. With the advancement of technology, the design and manufacturing process of butterfly valves are constantly being optimized, but the standardization of their core usage methods still needs to be followed by the industry.