Types of Metal Bellows Expansion Joint

1. Bellows expansion joints

A device consisting of one or more bellows and structural components, used to absorb changes in the dimensions of pipes and/or equipment caused 

by thermal expansion and contraction.

2. Circular bellows

A circular flexible element in an expansion joint consisting of one or more circular corrugations and straight edge segments at the end. 

For reinforced U-shaped bellows and omega-shaped bellows, including reinforcing rings and equalizing rings.

3. Rectangular bellows

A rectangular flexible element in an expansion joint, consisting of one or more rectangular corrugations and straight end segments.

4. Single axial expansion joint

Composed of a bellows and structural components, it is mainly used for expansion joints that absorb axial displacement 

but cannot withstand the pressure thrust of the bellows.

5. Externally pressurized axial expansion joint

It consists of a bellows that withstands external pressure, an outer tube, and end rings, and is mainly used to absorb axial displacement 

but cannot withstand the pressure thrust of the bellows.

6. Universal Untied Expansion Joint

Composed of two bellows connected by a central tube and structural components, this expansion joint is primarily used to absorb combined 

axial and lateral displacements but cannot withstand the pressure thrust of the bellows.

7. Pantograph linkages universal untied expansion joint

Composed of two bellows connected by a central tube and proportional connecting rods, etc., this expansion joint is mainly used to absorb combined 

axial and lateral displacements but cannot withstand the pressure thrust of the bellows.

8. Single  hinged expansion joint

An expansion joint consisting of a bellows, pins, hinge plates, and vertical plates, which can only absorb angular displacement in one plane and 

withstand the pressure thrust of the bellows.

9. Single gimbal expansion joint

An expansion joint consisting of a bellows, pin, hinge plate, universal joint, and vertical plate, capable of absorbing angular displacement in any plane 

and withstanding the pressure thrust of the bellows.

10. Universal tied expansion joint

Composed of two bellows connected by a central tube, tie rods, end plates, and spherical and conical washers, this expansion joint can absorb lateral 

displacement in any plane and withstand the pressure thrust of the bellows.

11. Universal hinged expansion joint

Composed of two bellows connected by a central tube, as well as structural components such as pins, hinge plates, and vertical plates, this expansion joint 

can only absorb lateral and angular displacements within a single plane and can withstand the pressure thrust of the bellows.

12. Universal gimbal expansion joint

Composed of two bellows connected by a central tube, as well as structural components such as a cross pin, hinge plate, and vertical plate, 

this expansion joint can absorb lateral and angular displacements in any plane and withstand the pressure thrust of the bellows.

13. Elbow Pressure Balanced Expansion Joint

A joint consists of two working bellows connected by a working bellows or intermediate pipe, a balancing bellows, elbows or tees, end caps, tie rods, end plates, 

and spherical and conical washers, etc. It is primarily used to absorb combined axial and lateral displacements and balance the pressure thrust of the bellows.

14. In-line pressure balanced expansion joint

It consists of two working bellows at both ends, a balancing bellows in the middle, tie rods, end plates, and other structural components. 

It is mainly used to absorb axial displacement and balance the pressure thrust of the bellows.

15. Bypass In-line Pressure Balanced Expansion Joint

Composed of two identical bellows and structural components such as end rings, end caps, and outer tubes, this expansion joint is mainly used to absorb 

axial displacement and balance the pressure thrust of the bellows.

16. Universal hinged in-line pressure balanced expansion joint

It consists of two working bellows at both ends, a balancing bellows in the middle, and structural components such as pins, hinge plates, and vertical plates.

It is mainly used to absorb axial displacement and lateral displacement in a plane, and to balance the pressure thrust of the bellows.

17. Universal gimbal in-line pressure balanced expansion joint

It consists of two working bellows at both ends, a balancing bellows in the middle, and structural components such as pins, hinge plates, universal rings, 

and vertical plates. It is mainly used to absorb axial displacement and lateral displacement in any plane, and to balance the pressure thrust of the bellows.

18. Externally pressurized in-line pressure balanced expansion joint

It consists of two working bellows that bear external pressure, a balancing bellows that bear external pressure, and structural components such as end pipes, 

connecting pipes, outer pipes, and end ring assemblies. It is mainly used to absorb axial displacement and balance the pressure thrust of the bellows.