The designconsists of 2 end pieces and a body. The end pieces can be threaded, flanged or welded to the pipe. With smaller valves the main body section could be removed for cleaning or repair without removing the end caps. This can be a very valuable option because it prevents a line shutdown if maintenance is required. For bigger valves where the end pieces are bolted to the body instead of clamping it with tie rods this is not possible.