Unisource metallic retaining rings

A rubber expansion joint is a flexible pipe connection that can handle fuels that are 50% or more aromatic. It has a range of applications and can withstand pressures of up to 2,000 psi. There are a few different types of expansion joints on the market. HNBR rubber expansion joints, for example, are suitable for fuels with 50% or higher aromatic content. Other options include Style 301 single sphere connectors, Flexi-Spool, and Unisource metallic retaining rings.

HNBR rubber expansion joints are suitable for fuels with up to 50% aromatic content

HNBR rubber expansion joints have a plethora of advantages, including their high abrasion resistance liner, steel wire cord reinforcement, and chloroprene CR cover. These types of joints can tolerate a wide range of temperatures, are suitable for fuels with up to 50% of aromatic content, and have excellent aging, weathering, and ozone resistance. They are also flame-resistant up to +800 degC for 30 minutes.

HNBR rubber expansion joints are used in fuel systems to reduce the risk of explosions. The material’s high solubility means it’s suitable for a variety of fuels, including gasoline, diesel, and kerosene. They are also ideal for oily fuels. ERV-GS HNBR rubber bellows feature a high-quality HNBR (nitrile) liner and a chloroprene CR cover.

Style 301 single sphere connectors

Unisource Style 301 single sphere rubber expansion joint connecters feature high-quality EPDM rubber and galvanized ductile iron threaded female union ends. They are designed with https://evrproducts.com/products/rubber-duckbill-check-valves/wastop-backflow-valve/ special cable restraint attachments that surround the ends and help prevent overextendation due to pressure thrust forces. These connectors are especially useful in isolating small diameter piping from vibrating mechanical equipment.

Unisource’s Style 301 single sphere rubber expansion joint connecters feature a unique rubber connector that acts as an expansion joint, absorbing pipe motion and noise. They match the corresponding dimensions of spool type expansion joints, facilitating direct replacement. They also have a short face-to-face dimension, resulting in a low-cost piping system. They also exceed the performance criteria set by the Rubber Expansion Joint Division, part of the Fluid Sealing Association.


The Flexi-Spool rubber expansion joint features a single or double sphere design. They are also available as female unions or eccentric joints, with standard carbon steel end fittings and 150 or 300 psi stainless flanges. These joints are available in different sizes and working pressures, and the stock material elastomer is EPDM.

These expansion joints are capable of withstanding the force of axial compression and axial extension along its long axis. The joint can also undergo angular deflection, or displacement of two ends in a circular arc. The elastic properties of rubber allow for large deformations and recover quickly from bends.

Unisource metallic retaining rings for rubber expansion joint flanges are designed to connect rubber expansion joints to the flanges of the mating piping system. These rings are 3/8″ thick, drilled for the expansion joint flanges, and are available in stainless steel and epoxy coated versions.

Typically, Unisource recommends using ring gaskets with rubber expansion joints, but full face gaskets are also available. Full face gaskets are recommended for rubber expansion joints that contain PTFE liners. In addition to the Unisource metallic retaining rings, Unisource offers a series of metallic retaining rings with an embossed serial number. These retaining rings are available in different styles, including concentric, eccentric, and multiple arch styles.