For processes that put heavy demands on valves, having a two piece of ball valve is more convenient than one 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.

Three piece ball valves also allow for elastomers to be changed to accomodate different process conditions, temperatures, pressures and flows.

Need to weld the valve in place? Another benefit is being able to move the body with trim out of the way while welding, ensuring the internals stay intact.