Thread Content
The pneumatic flanged butterfly valve is a self-controlled pneumatic metal hard-seal butterfly valve with a triple-eccentric structure and a layered metal seal seat. It features an integrated valve shaft design to prevent displacement of the shaft due to changes in pipeline pressure, as well as dust-proof bushings that prevent pipeline fluids from entering the shaft and preventing it from rotating properly. Since the center of the valve body does not coincide with the center of the valve shaft, the interference angle is offset, allowing the valve to disengage from the seat promptly when opened; this reduces wear on the seat. When closed, the valve achieves a tighter seal with each closure, enhancing its service life and ensuring balanced sealing performance. Pneumatic flanged butterfly valves feature a centerline design. Their main components include the valve body, butterfly disc, valve seat, valve stem, and actuation mechanism. Depending on the physical and chemical properties of the medium in question, materials resistant to corrosion, light, and aging can be used. These valves can be employed in fluid pipelines in industries such as water supply and drainage, air conditioning, petroleum, chemicals, food processing, and energy systems, where they serve as devices for regulation and shut-off. The proper installation of pneumatic flanged butterfly valves affects the efficiency of the equipment, and the maintenance of such valves is also relevant to their performance. Improper installation or lack of maintenance can lead to a decline in the performance of butterfly valves, which may pose risks; therefore, users should carry out regular inspections and maintenance on pneumatic flanged butterfly valves. Five elements for installing pneumatic flanged butterfly valves: 1. The butterfly disc is installed in the diameter direction of the pipeline. 2. During installation, the butterfly valve disc must be in the closed position. 3. The operating position should be determined based on the rotation angle of the butterfly valve disc. 4. For butterfly valves equipped with a bypass valve, the bypass valve should be opened first before opening the butterfly valve. 5. It should be installed in accordance with the manufacturer’s installation instructions; for pneumatic flanged butterfly valves with heavy weights, a stable foundation must be provided. Maintenance of pneumatic flanged butterfly valves: 1. Install a signal device at its location. When the operating butterfly valve is in a position other than fully open, a signal is generated; at this point, the illuminated display in the control room lights up, allowing operators to determine whether the valve has been shut down due to an accident or only partially. 2. Standardize the general handling procedures for partial passing through checks; this allows the oil supply valve to be raised, and it should be lowered only after the full-open signal is received. 3. Improve the quality of its maintenance work. Due to its large size and stable positioning, resolving the issue of getting the rotating shaft in place requires disassembling it and lifting it, which involves a lot of work. Moreover, the limited space in the butterfly valve chamber makes this task difficult. Additionally, because of long-term use and significant wear, it is hard to ensure quality even when carrying out disassembly and major repairs. Currently, the common approach is to use shims to adjust the center position in order to address the issues with the butterfly valve body itself. Improve the maintenance process to ensure that the disc valve is parallel to the flow direction once it is fully open. 4. Improve the sealing performance of the relay, replace it with better sealing materials, and regularly fill the opening chamber of the relay piston with oil. 5. Install a water monitor at the water inlet to monitor water flow fluctuations, and add an item to the operating procedures for the butterfly valve as a regular task: to operate the oil valve once a week in order to fill the oil circuit of the actuator.