A one-piece ball valve has body and end connections formed from a single piece of material. This construction presents a comparatively reduced number of opportunities for leakage. The valve trim and seals are inserted through one of the end connections. This type of valve will not have a port size equal to the line size.
Two-piece ball valves are some of the most common ball valves used. As the name suggests, the two-piece ball valve consists of two pieces, one piece that has one end connection and the body. The second piece fits into the first, holds the trim in place and includes the second end connection.
For processes that put heavy demands on valves, having a 3-piece valve is more convenient than one or two-piece ball valves. When seats and seals need to be routinely replaced, having three pieces allows for easy disassembly, servicing and reassembly without having to do major cutting on the pipe.
The trunnion ball valve is an essential device for regulating the flow of fluids- steam, gas, or oil in pipeline. It is quarter-turn designs with a ball capable of rotating 90 degrees on its axis to either block or allow the flow of fluid. These valves have a spherical disk design at the center, which rotates to regulate the start-stop flow cycle.
Top entry ball valves are typically used in process systems where in-line maintenance is preferred over full valve removal. As such, it is common for top entry ball valves to be used in high-pressure applications that require infrequent maintenance.
The flanged ball valve is similar to the standard ball valve but has mating connections or flanges that allow for quick and easy replacement of a damaged valve. For instance, a valve without flanges would require an individual to manually cut piping and then reconnect it with a new valve in place.
The Multi-Way Ball Valve design makes the multi-port ideal for flow switching operations. These valves are used for a variety of purposes. For example, they ensure the smooth switching of alternative fuels during shipping.