Rubber-backed expansion joint

An expansion joint for connecting pipe ends comprising:

• (a) a tetrafluoroethylene polymer tube having a knit reinforcing fabric embedded within and mechanically interlocked with the polymer each end of the tube having a radially extending flange, the flange having a front face and a rear face, the front face in use adapted to be in sealing relationship with the pipe end, the tube having an annular arch spaced between the tube flanges;
• (b) a steel stub end having a radially extending flange at one end, the flange having a front face and a rear face, the front face of the stub end flange being in contact with the rear face of the tube flange;
• (c) a rubber backing fastened to the knit reinforcing fabric embedded in the tube;
• (d) a back-up ring disposed about the tube at each end of the tube, the ring being in contact with the back face of the stub end flange, the rings having apertures through which fasteners may be fitted to secure the rings to the pipe ends, thereby compressing the tube flanges between the back-up rings and the pipe ends;
• and
• (e) a washer spaced between the rubber backing and the back-up ring, the washer preventing the rubber from binding the ring, whereby the ring is permitted to rotate about the tube between the washer and rear face of the stub end flange, allowing alignment of the ring peripheral fastener apertures with corresponding apertures in the pipe flange to which the expansion joint is fastened.

An expansion joint for connecting pipe ends, comprising:

• (a) a flexible tube having radially extending flanges at each end, the flanges having a front face and a rear face, the front face in use adapted to be in sealing relationship with the pipe end, said flexible tubing having an elastomeric backing attached thereto;
• (b) a tubular stub end having a radially extending flange at one end, the flange having a front face and a rear face, the front face of the stub end flange being in contact with the rear face of the tube flange;
• (c) a back-up ring disposed about the tube, the back-up ring in abutting relationship with the rear face of the stub end flange;
• the ring having fastening means whereby the ring is secureable to the pipe end to be connected, thereby compressing the tube flanges between the back-up ring and the pipe ends;
• and
• (d) a washer spaced between the elastomeric backing and the back-up ring.

An expansion joint for connecting pipe ends comprising:

• (a) a fluoropolymer tube having a knit reinforcing fabric embedded within and mechanically interlocked with the polymer, each end of the tube having a radially extending flange, the flange having a front face and a rear face, the front face in use adapted to be in sealing relationship with the pipe end, the tube having an annular arch spaced between the tube flanges;
• (b) a steel stub end having a radially extending flange at one end, the flange having a front face and a rear face, the front face of the stub end flange being in contact with the rear face of the tube flange;
• (c) a rubber backing fastened to the knit reinforcing fabric embedded in the tube;
• (d) a back-up ring disposed about the tube at each end of the tube, the ring being in contact with the back face of the stub end flange, the rings having apertures through which fasteners may be fitted to secure the rings to the pipe ends, thereby compressing the tube flanges between the back-up rings and the pipe ends;
• and
• (e) a washer spaced between the rubber backing and the back-up ring, the washer preventing the rubber from binding the ring, whereby the ring is permitted to rotate about the tube between the washer and rear face of the stub end flange, allowing alignment of the ring peripheral fastener apertures with corresponding apertures in the pipe flange to which the expansion joint is fastened.