Pressure balanced

Pressure Balanced Expansion Joints use a combination of bellows and tie devices to absorb the movement without imposing pressure loading on the equipment or piping system. The only resulting force is the spring rate, which is normally of lower magnitude. They can be designed to absorb axial or lateral movements

See also

Gimbal Hinged Pantographic Pressure balanced Single Axial Single axial and universal with tie rods Universal
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