TYPES OF RUBBER EXPANSION JOINTS

ARCH TYPE:

A full face integral flange design is available in both Single Arch and Multiple Arch Types.

Single Narrow Arch Type:
Construction is of fabric and rubber, reinforced with metal rings or wire. The full face flanges are integral with the body of the joint and drilled to conform to the bolt pattern of the companion metal flanges of the pipeline.

This type of rubber face flange is of sufficient thickness to forma tight seal against the metal flanges without the use of gaskets.

Multiple Narrow Arch Type:
Joints with two or more arches may be manufactured to accommodate movements greater than those of which a Single Arch Type joint is capable.

Multiple Arch joints of most manufacturers are composites of standard sized arches and are capable of movements of a single arch multiplied by the number of arches.

PTFE Lined
Spool Arch Type joints are available in many standard pipe sizes with Fluoroplastic liners of TFE and/or FEP. These liners are fabricated as an integral part of the expansion joint during manufacture and cover all wetted surfaces in the tube and flange areas. Fluoroplastic provides exceptional resistance to almost all chemicals within the temperature range of the expansion joint body construction.

Non-metallic Reinforced Design
Constructed similar to the Spool “Arch” Type except the carcass does not contain wire or metal ring reinforcement. Pressure resistance is accomplished through the use of special external flanged retaining rings furnished with the joint.

Reducer Type
Reducing expansion joints are used to connect piping of unequal diameters. They may be manufactured as a concentric reducer with the axis of each end concentric with each other or as an eccentric reducer having the axis of each end offset from each other. Tapers in excess of 20 degrees are not desirable.

Sleeved Arch Type
This joint is similar to the “Arch” type except that the capped sleeve ends have an I.D. dimension equal to the O.D. of the pipe. These joints are designed to slip over the straight ends of the open pipe and be held securely in place with clamps. This type of joint is recommended only for low to medium pressure and vacuum service because of the difficulty of obtaining adequate clamp