What connection method is used for DN20 ball valves? Flange? Threaded? Welding?
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Used on DN20 process pipelines. What type of ball valve should be chosen? Which connection method to choose?
It depends on your requirements. For small diameters like DN20, two-piece or three-piece designs are more common, and there are many different types and connection methods available. It is generally connected using threaded fittings and flanges; welding is hardly used.
Flanges or threads are used when the pressure is not high; welding is generally employed for high pressures
The question posed by the original poster is too vague; specific operating conditions should be provided. Without operating conditions, the discussion is meaningless.
Flange connections facilitate disassembly, assembly, and replacement.
It is generally connected using threaded joints and flanges. Flange connections are preferred in the middle of the pipeline, as they facilitate replacement.
Consider the application and pressure rating. Flange threaded connections are suitable for low pressures and are easy to disassemble.
Used on DN20 process pipelines. Ball valves with good sealing performance should be selected. Choose the connection method: flange connection is generally used; welding is considered for high-pressure applications; slip coupling can be an option when high precision is not required.
Depending on the operating conditions and environment, threaded connections are the most common and widely used in low-pressure applications. Flanges are generally used in medium-pressure applications, while flanges or butt welding are employed in high-pressure applications
For low-pressure applications with normal flange connections, threaded connections can be used if drainage is required; for ultra-high pressure applications, ball-headed welded connections are chosen, which are essentially the same as threaded connections
Depending on the operating conditions and the medium, flanges are generally used more often