The one-piece, two-piece, and three-piece are all stainless steel ball valves. They’re ready for action with the stainless steel investment casting body, and they operate at a working pressure of 1000 PSI. They also come with blow-out-proof stems and a locking handle.
Flat Union with PTFE Seat, is normally used in low temperature (Under 120 degrees), because of the PTFE gasket.
Conical Union with metal to metal sealing, so it has no strict requirements about the temperature, it could be used at high temperatures.
Different thread sealing depends on the geographical region, size of the pressure system, and the environment. For example, In Aisa, such as China, Korea, Japan, etc normally use BSPT; In the U.S, Canada, etc always use NPT, Then the BSP thread is most popular in the UK, Europe, Australia, New Zealand, and South Africa. While one sealing style is not inherently better than another each style has its application.
The ball valve could be in vertical or horizontal pipe runs. They are bi-directional therefore flow direction is not critical; In principle, the ball valve installation has no direction. Still, in the actual building, to prevent excessive leakage between the valve body and the valve cover, the ball valve body is usually connected to the tank’s direction or the material. The best practice is to set up the valve handle to point in the direction of flow whenever possible.
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