GB798650A - Improvements in pipe couplings - Google Patents

Abstract

798,650. Pipe joints. DAIRY PIPE-LINES, Ltd., and MORRIS, W. Nov. 8, 1956 [Nov. 15, 1955; March 16, 1956], Nos. 32646/55 and 8295/56. Class 99(1). A coupling particularly for pipes conveying liquid foods comprises pipe ends 1, 2 with flanges 3 which have recessed faces fitting against a resilient sealing ring 4, and external bevelled faces 5, the bevel angle of which is between 10 and 20 degrees to a normal to the pipe axis which are surrounded by a ring 6 split into segmental parts and held by simple annular holding means against separation and without substantial constriction. The sealing ring is of T-section, Fig. 4, the stem being slightly divergent and with a concave inner periphery which becomes flush or slightly convex with the pipe bore under compression. In assembling the joint, the split ring is pressed or tapped inwardly to compress the sealing ring, the steep bevels on the flanges allowing only small compressive movement on the sealing ring but providing greater resistance to release, and a holding ring 8 is pressed or tapped axially over the split ring to secure the joint. The edge of the split ring is bevelled at 9 to give a lead to the sleeve. The end faces of the pipes and the flanges are of accurately shaped stainless steel and the ring 4 is made of accurately moulded natural or synthetic rubber or material such as nylon so that an effective seal is provided for small axial movement in coupling. In a modification, as an alternative to the sleeve 8 a C-clip is used. The holding means may comprise plain rings recessed to receive the split rings, or a single wide band could be used, the periphery of the split ring having a rebate to allow the band to pass on to and seat about the middle of the coupling. Specification 17432/11 [Class 99] is referred to.