Series DF/DB Expansion Joints are designed for applications requiring standard movement, maximum noise, vibration and sound absorption.
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Generally resistant to oil and grease, moderate chemicals, fats, many hydrocarbons and ozone. Resistant to barnacle growth.
Good resistance to animal and vegetable fats, strong and oxidising chemicals, oils, heat and greases.
Ethylene Propylene Rubber (EPDM)
Most effective for applications involving water, steam or diluted acids.
Resists solvents, halogenated hydrocarbons, oxygen, weather, ozone, oils and chemicals.
TFE sheet or Teflon™ coated fibreglass used as a vapour barrier where condensation of corrosive gases may occur.
A high quality elastomer, recommended for all environments except those with sulphur gas (SO2 or SO3). Usable in -70 to 500° F applications.
Used as insulation pillow and composite layer for service conditions up to 2500° F.
Baffles or flow liners are used when the gas stream contains particulates which may impinge upon or abrade the inner surface of the duct connector. Baffles can be constructed as a one-piece or two-piece element, depending on movement requirements and service conditions.
Composite Type – Suitable for temperatures from 400°F to 2500°F, composite type expansion joints consist of various plies of materials laid one over the other and vulcanised, bonded, sewn or mechanically fastened together in the clamp area. This allows each layer of material to function independently of the others.
Elastomeric Type – This type of expansion joint is constructed of elastomers and reinforced with high strength fabric. Choice of elastomer and fabric, depends on applications conditions. Maximum temperature for elastomeric expansion joints is 400° F.
High Temperature and Buildup Solutions – Fly ash or other solid particulates can accumulate between the expansion joint and flow liner in such quantities that damage to the expansion joint may occur. A mesh or cloth seal between the liner and ducting can help prevent this problem. Another method of eliminating this buildup is the use of an insulation pillow to fill the cavity. Insulation pillows can also be used to increase the upper temperature limits of the expansion joint. Care must be taken when using an insulation pillow, so that corrosive chemicals do not condense in the cooler region adjacent to the expansion joint and duct work.
All EVR products are guaranteed for one full year against defects resulting from faulty workmanship or materials. If any such product is found to be defective by reason of faulty workmanship or materials, upon written notice and return of the product, the defective product will be replaced by us free of charge, including the shipping charges for the replacement product. Claims for labour costs and other expenses required to replace such defective product, or to repair damage resulting from the use thereof will not be allowed by us. Our liability is limited to the price paid for the defective product. EVR Products shall not be bound by any warranty other than the above set forth unless such warranty shall be in writing. This literature is published in good faith and is believed to be reliable, however, EVR Products does not represent and/or warrant in any manner the above information and suggestions contained in this brochure. Data presented is the result of laboratory tests and field experience.