A pressure balanced expansion joint is used to accommodate and counteract the bellows pressure thrust. An additional bellows joins to the construction to incorporate into the unit and is subject to the line pressure to generate a force equal and opposite to that on the main bellows. Connecting all these bellows together neutralizes the pressure load on the construction.
Pressure balanced expansion joints are generally installed at changes of direction in piping (elbow type) but in-line types are also available.
Use of pressure balanced expansion joints helps the piping designers not to create main anchors to accommodate combined movements at the direction changing points
Limited number of manufacturers design and manufacture pressure balanced expansion joints requires a great deal of knowledge and expertise.
Ayvaz is a member of this exclusive group.
