The full external pressure balance expansion joint is mainly used to compensate the axial displacement of the piping system. It has the advantages of good stability, large compensation amount, and no internal pressure thrust. It is mainly used in steam pipelines with larger diameters, higher pressures and difficult to install fixed brackets.

Working temperature: -50℃ - 420℃

Medium: liquid, gas, etc.

Externally Pressurized Expansion Joints  also known as pressure compensators are primarily used to absorb long axial movement. The externally pressurized designs key features include,

• Better pressure stability (less susceptible to squirm) allowing longer axial movement
• Integral external cover and liner
• Optional torque control tabs and axial limit stops
• Self draining convolutions

Better pressure stability (less susceptible to squirm) allowing longer axial movement

Integral external cover and liner

Optional torque control tabs and axial limit stops

Self draining convolutions

Internal and external pressure balanced expansion joint are also called internal and external pressure balanced pipe expansion joints and metal corrugated expansion joints.

The internal and external pressure balanced compensator has the ability to absorb internal pressure thrust and has the characteristics of good guidance, low product stiffness, and small overall size. Internal and external pressure balanced compensator connection methods: ① flange connection type ②) pipe connection type. Axial compensation amount of internal and external pressure balanced corrugated compensator: according to user requirements:

1. Structural features of internal and external pressure balanced corrugated compensator (metal bellows expansion joint)

Metal expansion joints are connected by internal pressure expansion joints and external pressure expansion joints.

2 Compensation characteristics of internal and external pressure balanced corrugated compensator (metal bellows expansion joint)

This pipe expansion joint has the characteristics of large compensation, no internal pressure thrust, and small elastic reaction force.

3. Precautions for installation and use of internal and external pressure balanced compensator (metal bellows expansion joint):

(1) When installing, the drain port should be facing downwards.

(2) After on-site installation, the tie rod must be removed.

(3) During installation, the medium flow direction is consistent with the flow direction mark of the pipeline expansion joint.

4. Calculation of the force exerted by the internal and external pressure balanced corrugated compensator (metal corrugated expansion joint) on the support:

Axial elastic force: Fx=Kx*(f*x)

Kx-axial stiffness N/mm

X-Axis actual deformation mm

f - calculation coefficient, when pre-deformation (including △X=0) f=1/2, when no pre-deformation is performed, f=1.