Abstract: A resilient packing for use in sleeve-type couplings is disclosed which has a cross-sectional shape that generally conforms to the cross section of an associated annular groove. The packing ring has a root portion which is axially narrower than the groove root diameter. At the circumference, the ring has radially protruding bead and a pair of axially protruding shoulders. The axial distance between the shoulders exceeds the axial width at the corresponding portion of the groove to axially stabilize the ring in the groove. Sides of the ring are generally spaced from corresponding adjacent side walls of the groove to accommodate axial expansion during radial compression of the ring at the time of coupling assembly. Additional opposed circumferential grooves may be provided to multiply the cross-sectional configuration and attain a seal ring suitable for comparatively wide groove.

Abstract: A sealing ring of elastic material, more particularly for a plug-in type pipe joint made up of two concentrically interfitting pipe elements of a mineral material in the case of which the sealing ring can be pre-assembled by insertion into the outer pipe element or socket before the insertion of the inner pipe element or spigot. The sealing ring has a substantially V-shaped axial section profile with the formation of two annular lips consisting of a support lip and a sealing lip. The sealing ring also has a sealing foot, which is opposite to the angle included by the support lip and the sealing lip and said sealing ring can be fixed by its sealing foot and/or by a holding part molded additionally on the sealing ring, by dint of an annular groove constructed in the inner wall of the socket in order to prevent axial displacement of the sealing ring in the insertion direction of the spigot.