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Joints
The Series SJ-21 Expansion Joint
SJ-21 (16K)

The SJ-21 is the industry standard spool-type expansion joint. Available in configurations from zero to four arches - depending on movement requirements - and 3 standard pressure ratings in a variety of elastomers, this hand-built expansion joint can be adapted to the most unusual or difficult applications.

SJ-21Diag (11K)
(1) - Lengths shown are for new design. Replacement parts should be ordered to the exact F/F dimension. *Items are not normally supplied in multiple "open" arches, as squirm can occur. Minimum length of "face to face" can be reduced by eliminating the arch. Number of arches required depends upon anticipated total movement of the expansion joint.

2 - Multiple arch movement = single arch movement x number of arches. "Filled Arch" construction reduces movement by 50%. *Items are normally furnished with filled arches and movement shown should be reduced accordingly.

3 - Forces are based on one single open arch at zero pressure conditions, therefore, should be considered only as approximate. Contact EVR for forces of multiple and filled arch products. Angular force is expressed in "foot pounds". For spring rates, contact EVR.

4 - Flange dimensions shown are in accordance with 125/150 pound standards of ANSI B16.1, B16.5, AWWA C-207 Table 3 Class E; AWWA C-207 Table 1 and 2 Class D. Retaining ring width is 3/8" all sizes. Flange thickness is EVR standard.

5 - Flange drilling also available in all international standards or custom applications. For more information, contact EVR.

Notes: Control unit assemblies are recommended for all applications. To ensure correct length, customer should provide width of mating flange or flange specification.
Additional Information
brochure (1K) Brochure specs (1K) Specifications
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