Universal Bellows

About Universal Bellows

A Universal Bellows also called a Universal Expansion Joint is an expansion joint design that consists of two bellows elements connected by a common center pipe spool piece It is mainly used to absorb large lateral movements in a single plane or multiple planes and can also absorb some axial and angular movements

What Does a Universal Bellows Contain

Two Bellows Elements

Two corrugated flexible metallic bellows joined by a center pipe spool

The dualbellows arrangement provides high flexibility compared to a single bellows

Center Spool Intermediate Pipe

A rigid connecting pipe between the two bellows

Maintains spacing and transfers loads between bellows

End Connections

Flanges or Weld Ends for pipeline connection

Tie Rods Optional but Common

Often added to control the pressure thrust and keep the universal joint restrained

Helps guide lateral movement and limits overextension or compression

Inner Sleeve Optional

Installed inside to protect bellows from erosion turbulence or highvelocity flow

Outer Cover Optional

Shields the bellows from mechanical damage and environmental exposure

Key Characteristics

Movement Absorbed Primarily lateral displacement plus some axial and angular movement

Ideal For Piping systems with offsets large lateral expansion or where space constraints prevent using a single axial unit

Available Types

Unrestrained Universal Bellows requires external anchors and guides

Tied Universal Bellows includes tie rods to resist pressure thrust

Summary Table

Component Purpose

Two Bellows Provide flexibility for large lateral movement

Center Spool Maintains spacing and structural integrity

End Connections Connects the unit to the pipeline

Tie Rods Optional Controls pressure thrust and limits movement

Inner Sleeve Optional Protects against erosion and flow turbulence

Outer Cover Optional Mechanical protection