Conduit system with expansion coupling and combined spacer and sealing sleeve

摘要

Insulated jacketed conduit units sealed in end to end relation by expansion couplings are insulated, sealed and spaced at the coupling zones with protective combined spacer and sleeve rings or washers which surround the coupled ends of the conduits, are bottomed on and squeezed between the insulation of adjacent units to position the conduit ends for expansion and contraction without breaking the seal therebetween and seat on adjacent ends of the jackets to protect the insulation. The combined spacer and sleeve rings or washers can be molded to have a relatively soft compressible inner washer portion and a tough stiffer sleeve portion with resilient sealing lips in the open ends thereof for sealingly engaging the jackets.