Lateral & Universal Expansion Joints

Lateral and universal joints use two bellows separated by a centre spool. That single change in geometry turns a joint that absorbs axial movement into one that absorbs sideways offset — and, when tie rods are added, one that relieves the anchors of pressure thrust entirely.

Tied lateral

Two bellows, a centre pipe, and tie rods spanning end to end. The rods carry the pressure thrust, so the anchors do not. In exchange the joint loses axial capability — the rods that absorb the thrust also prevent the joint extending. What remains is generous lateral offset in any direction.

This is the standard answer for a pump or compressor connection where the nozzle load must be kept low, and for offset legs in a piping run.

Untied universal

The same two-bellows geometry without the rods. It absorbs large axial movement and large lateral offset together, which no single-bellows joint can do — but the pressure thrust returns to the anchors. Used on long runs where both movements are significant and anchors exist to take the load.

Sizing note

Lateral capability rises with the length of the centre spool. Where a large offset is required at a short face-to-face, either the spool grows or the bellows must be longer — there is no way around the geometry. Give us the offset, the face-to-face you can accommodate and the pressure, and we will tell you whether the envelope closes.

Envelope