Flanged ball valves: why are two-piece types used in most cases these days?
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Flanged ball valves come in wide-type, integrated-type, two-piece, and three-piece versions; however, the two-piece type is the most commonly used nowadays. Why is that? Is there anyone who has done extensive research in this area? Could they share their experience? Thank you in advance!
First, search the content on the forum to see if there are any relevant explanations. The two-piece type is probably relatively better in terms of cost, manufacturing difficulty, and sealing performance, right?
It should be a threaded ball valve. Their uses vary; it depends on the application. In industry, three-piece valves are the most commonly used ones, as they offer good sealing performance and prevent leaks. Installation and maintenance are both very convenient
Two-piece flanged ball valves are more common; three-piece flanged ball valves have also been manufactured in the past, but they simply don’t look as good as the two-piece ones
It should be a ball valve, with 2 pieces
An additional seal increases the risk of leakage; the higher the pressure, the more likely two-segment designs are to be used
Most castings are two-piece, while many forged parts are three-piece
Personal experience dictates the choice to facilitate maintenance on the pipeline
The compressive strength of the three-piece type is not as high as that of the two-piece type (it should be used at pressures below 64 bar). Its cost is higher than that of the two-piece type, but for low-pressure welded pipes, the three-piece type with welding connections is cheaper than the two-piece type with flange connections; it depends on the specific circumstances
I want to ask: top-mounted, two-piece, or three-piece?