Sleeve Type Series 300 is a sleeve type rubber expansion joints. This slip-on and lightweight construction represents the most cost-effective arrangement for low pressure applications. Mating flanges and hardware are not required, adding to the cost-effectiveness of this arrangement. The construction includes a high grade tube, a seamless cover, multiple layers of high-strength tire cord and stainless steel worm gear clamps. Additionally, they are designed to absorb large all-directional movements, reduce noise and vibration and misalignments.

These joints are available in 1 arch, 2 arch, 3 arch, 4 arch, 5 arch and even 6 arches. Mercer specially designs these joints for seismic control by adding anti squirm guides.

Mercer Flexmore Series 450 is the most economical, full-pressure elastomeric expansion joint available. Tough fabric and tire cord plies are bonded between the tube and cover in a steel mold and then cured in a thermostatically controlled steam chamber. The product is uniform in both appearance and performance. A wide, low profile arch provides exceptional flexibility and virtually eliminates the need for filled arches in all but the most severe sludge and slurry applications. External integral flange reinforcing rings control both radial and arch swell. A variety of cover and tube elastomers are available, offering superior chemical, aging and temperature resistance from -30° to +250°F operating temperatures.

The vast majority of Invincible Heavy Duty Expansion Joints Series 500 & 600 have 1 arch, but if the movements cannot be accommodated, we build them with 2, 3 or 4 arches, so the sum of the movements of each individual arch add up to the specifications. Multiple arches are a great help in misalignment and unparallel face situations as well.

A high grade of Natural Rubber is still an excellent choice for most water applications below 180°F (82°C). DuPont™ Neoprene has the broadest range of chemical resistant capabilities and higher temperature resistance than Natural Rubber. Butyl are generally used for temperatures up to 250°F (121°C). Peroxide cured EPDM will handle 350°F (176°C) and has outstanding aging characteristics. Nitrile is superior for general oil resistance. Both Natural Rubber and Hypalon® are excellent for abrasion resistance, and DuPont™ Viton® has outstanding chemical properties as well as temperature tolerance to 400°F (204°C).

Reinforcement fabrics may be Nylon, Polyester or DuPont™ Kevlar® for much greater strength and stability, particularly at the higher temperatures.

Since we cut all of our own tire cord, the ply angle can be changed to provide either larger movements, greater pressure resistance or shape stability.

The Flanged Concentric & Eccentric Reducing Expansion Joints Series FCR500 & FER500. Virtually all piping systems go through changes in diameter either in the run or at the equipment connections. Since an expansion joint or flexible connector is needed anyway, it makes good sense to have the expansion joint serve the dual purpose of changing the piping diameter and handling the expansion, misalignment or vibration problem all at one time. Should you work with a straight connector, it means that in addition to the expansion joint, an expensive cast iron or steel reducer must be used for the piping transition. This would result in a need for additional space and add to the cost as well.

While we have published transition sizes, and face to face dimensions, it is seldom that the cataloged sizes are what is needed on the job site. We vary the face to face dimensions as well as the two flange sizes to fit the application.

Concentric reducers are more common. The eccentric design is used primarily at pump inlets and outlets to provide smoother flow both in and out of the pump.

Since most of our competitors do not want to be involved with these difficult products, Mercer is very active in this market.

Series 700 Teflon® lined expansion joints are the Series 500 built over a preformed Teflon® tube. Since the Series 500 body provides the backing, we can withstand very high pressures and high temperatures. Teflon® lined expansion joints are used wherever the chemical content of the fluid is so corrosive as to be beyond the physical tolerance of a rubber material. They are also used in systems where conventional rubber might stand up quite well, but contamination must be avoided. We have built Series 700 joints as large as 60″ (1500mm) in diameter.

The Invincible 900 Series adopts the best features of our series 450 and 500’s. While rated at lower pressures, it has higher movement capabilities and lower spring rates. All joints are hand built by our skilled craftsmen. The 1/4″ minimum thickness solid elastomer tube is continuous. Multiple plies of rubber impregnated high strength polyester or nylon tire cord form the first pressure reinforcement over the tube. Arch swell in response to pressure and arch migration are virtually eliminated by crisscrossed layers of reinforcement that pass over the arch and around steel rings embedded on both sides at the base of the arch.

Similar to our Series 500 Invincible Expansion Joints, the Series 1000 offers robust construction using the highest quality rubber materials. Designed for low-pressure applications, the Series 1000 utilizes our largest arches to accommodate maximum movement. Multi-arch construction is available, allowing for up to 16 inches of axial compression, 6 inches of axial extension, and 6 inches of lateral deflection in our 4-arch configuration. Additionally, the large arch construction supports low spring rates to mitigate pipe stress due to offset, settling, or thermal expansion.