Butt-Weld Valve End Connections

Butt-weld Valve End Connections. In this case, the ends of the valve are bevelled to match wall thickness and machined bevel at the end of a mating pipe. A circumferential weld is made at the abutted mating bevels. 'Backing rings' which are basically sleeves fitting inside the pipe, are sometimes used to align the pipe and valve bores also to prevent 'icicles' and weld spatter from entering the pipeline. Butt-weld ends are used only on steel valves, normally in sizes 50mm and upwards, for the higher pressure/temperature applications in pipelines which do not require frequent dismantling.