The Series 240 and 242 rubber expansion joints are engineered in a molded style design thus making them inherently stronger than the conventional hand-built "Spool" types. Internal pressure within a sphere is exerted in all directions, distributing forces evenly over a larger area. The spherical design "flowing arch" reduces turbulence, sediment build up, thrust area and the effects of thrust on piping system equipment.

Greater movements are available with the Series 240/242 products as compared to the movements of conventional hand built spool types. These products have lower spring rates and are also easier to install in non-standard openings, caused by equipment
shifting or settling.

Easy product installation is made available with alignable metallic rotating ring flanges. The Series 240/242 expansion joints are manufactured with floating metallic flanges which freely rotate on the bellow, compensating for mating flange misalignment and speed up installation time. Tapped holes are also standard on our designs which eliminates the added bolting costs.

The Series 240/242 spherical rubber expansion joints are manufactured by high pressure molding of elastomer and high tensile fabric reinforcement. This process allows for thinner wall construction thus creating lower spring forces required to compress/extend/offset the expansion joint thus reducing stress on related piping/flange/equipment. (The Proco Style 240/242A and 240/242C expansion joints are acceptable for use with plastic piping systems where even lower
deflection forces are required.)

All Proco spherical 240 and 242 rubber expansion joints are furnished complete with plated carbon steel flanges and are tapped to ANSI 150# standards. Stainless steel flanges are also available on special order. In addition, other drilling standards such as ANSI 250/300#, BS10, DIN and JIS are available from stock and are listed in our brochure.