Metal Expansion Joints

Round Metal Expansion Joints

1.5 inch Through 144 inch in Diameter with wall thickness from 11 Gauge down to as thin as 31 Gauge. Metal bellows can be made in most alloys, including T-321 stainless steel, T-316 and T-304 stainless steel, Inconel 625, Monel 400 and Hastelloy C276. We also make multi-ply bellow capsules for the severe vibration applications or pressure redundancy. For larger diameters please contact us.

Expansion Joint Catalog

Metal-Flex Pump Connectors Catalog

Rectangular/Square Metal Expansion Joints

Any required length x width dimensions as needed with wall thickness from 11 gauge down to as thin as 31 gauge.

Single Expansion Joints

Universal Expansion Joints

Bellows Type Pump Connectors

Exhaust Flexible Connectors

Externally Pressurized Expansion Joints

Gimbal Expansion Joints

Hinged Expansion Joints

In-line Pressure Balanced Expansion Joints

Pressure Balanced Expansion Joints

Tie Rods

Tie Rods are designed to contain pressure thrust. The rods will have nuts or stops on the ends of the assembly to limit the overall length. When an expansion joint is designed for pure lateral offset the rods are defined as Tie Rods.

Ports

An opening in the body or stationary portion of an expansion joint in the form of a welding saddle or reinforced nozzle to provide a branch connection.

Hinges

Hinged expansion joints permit angular motion in one plane. The hinges are designed to react to a full pressure thrust. When two or three joints are correctly installed in a pipe run they absorb motion in one plane by lateral offset.

Root Rings

Root or external rings installed between each convolution of a bellows and at the ends with a cross section that approximates the shape of a compressed convolution. They reinforce the bellows against internal pressure, and limit the movement of each convolution to the rated travel.

Limit Rods

Limit rods are designed to contain pressure thrust. The rods will have nuts or stops on the ends of the assembly to limit the overall length. If the expansion joint is intended to absorb axial motion as well as lateral offset, the rods will have outboard stops to limit the expansion joint to the installed length plus any specified axial extension. This is defined as a Limit Rod.

Single and Dual Anchor Bases

A structure that reacts pressure thrust and spring forces produced by expansion joints in piping systems generally referred to as a Main Anchor or an Intermediate Anchor.

Particulate Barriers & Purge Connectors

In systems that have a media with significant particulate content (i.e. flash or catalyst), a barrier of ceramic fiber can be utilized to prevent corrosion and restricted bellows flexibility resulting from the accumulation of the particulate. Purge connectors may also be utilized to perform this same function. Internal liners must also be included in the design if the expansion joint includes purge connectors or particulate barriers.

Permanent & Removable Shrouds or Covers

External Covers providing a protective shield that spans the length of the bellows. Covers prevent direct contact with the bellows, offering personnel protection, as well as protection to the bellows from physical damage such as falling objects, weld splatter or arc strikes. They also serve a purpose as insulation of the bellows.

Standard & Drop-In Flow Liners

Internal liners can be used to either protect the metallic bellows from erosion or reduce turbulence across the bellows.