expansion joints installation directions
1. During pipe construction, the flexible rubber joint shall be
kept natural, do not deform the product purposely when installing.
2. During installing flange loosing rubber joint, the enhancing
ring (jutted inner steel wire rope) of spherical two ends shall be
completely installed inside the flange slot so as to prevent balls
to break away from flanges when pipes bear pressure. During
installing bolts, screw down symmetric six/four bolts and keep
balls and flanges remaining in order.
3. When connecting rubber joint and pipe flange, the bolt pole
shall extend to the pipe flange so as to prevent from crushing or
pricking the coved screw thread expanding because of pressure, all
bolts shall be pressures and screwed down and word congruously. If
the surrounding circumstance is bad, spring washer and flat gasket
shall be added to prevent bolts from loosing.
4.If arch/high arc rubber joints are adapted(for six-angle bolt
cannot pass through flange hole),double-head bolts shall be used
and try to reduce spherical screw thread jut and avoid crushing
balls expanding under pressure and prevent early damage of rubber.
5.When frequently use the rubber joint or near water (oil) pump
nozzles, stop block shall be added on both ends of flanges so as to
reduce the impact on pump and pipe caused by the length changes of
6. When adapting over DN1000 rubber joint, some length short pipe
shall be made on one flange end so as to help installation and
reduce labor strength. After connecting rubber joint and the short
pipe and other pipe, weld the short pipe and relevant pipe
7. In order to remove the radial deviation formed by short pipe
welding, use round steel or other relevant metal to temporarily
weld flanges on pipe’s two ends and make the rubber joint and
flange be a steel body. After welding, remove the welding again and
keep the rubber joint natural as usual.
8. When welding metal and flange, remember to cover the rubber
joint with shielding and prevent from burning balls.