Learn how a self-locking universal coupling uses grip elements, gasket compression and axial restraint to prevent pipe pull-out under pressure.

A self-locking universal coupling​ is designed to connect plain-ended pipes while also helping restrain axial movement. Compared with a conventional universal coupling, the self-locking design provides an additional gripping function that helps keep the connected pipes from separating under internal pressure or external movement.

The first selection parameter is the nominal diameter, normally expressed as DN. For example, a DN300 dismantling joint is generally intended for a DN300 pipeline, valve, pump, or other flanged component.

A typical Gibault joint consists of a center sleeve, two end rings or glands, rubber sealing rings, bolts and nuts. When the bolts are tightened, the end rings move toward the center sleeve and compress the rubber gaskets against the outside surface of the pipe.

Water and wastewater pipeline systems contain much more than straight sections of pipe. Valves, pumps, flow meters, strainers, hydrants, treatment equipment and other flanged components must all be connected to the pipeline.

Flange adaptors are widely used to connect plain-ended pipes to flanged valves, pumps, meters, hydrants, strainers, and other pipeline equipment. Although the component appears simple, choosing the correct flange adaptor requires more than matching the nominal pipe size printed on a drawing.