Abstract: A flexible, multilayer high-pressure hose with a diameter over 50 mm. It is suitable for conveying gases and gas-containing fluids. The hose contains a structure to vent gases and it is stable to the environment and to the material being conveyed therethrough.

Abstract: A flexible rubber hose has a spiral wound reinforcing core of resin bonded fibers embedded in the rubber, and a reinforcing insert, which may be woven or spiral wound, on the outer side of the helical core. The fibers are preferably glass fibers embedded in epoxy or phenolic resin.

Abstract: An elastic pipe-connecting component for pipes or pipelines or the like, comprises an elastic sleeve with flanges at each end and an annular expansion bulge in its midportion. In its undeformed condition, there is a cylindrical section on each side of the bulge, between the bulge and the portion of the component that is clamped to the pipe or pipeline. These exposed cylindrical portions are adapted to expand outwardly, to form two additional bulges, upon the imposition of pressure. To this end, they are reinforced with fibers of glass or steel or high strength synthetic, which are disposed at an angle to the axis of the component, of less than 55.degree.. A desirably long component is thus provided, from a minimum of material.

Abstract: A technique for producing flexible tubing for use in hydraulic systems employing non-combustible, force-transmitting liquids is described. An inner layer of the tube is formed from a load-carrying metal insert embedded in polychloroprene or natural rubber, which forms a good bond therewith. The exterior, liquid-contacting layers of the tube are formed from ethylene-propylene-terpolymer (EPDM) rubber, which withstands penetration by the hydraulic liquid. A good bond between the interior and exterior layers is provided by an intermediate layer formed from an EPDM-polychloroprene or EPDM-natural rubber mixture, the EPDM constituent being present in a proportion of about 50-80%. The transition layer may be embedded with a polymer-impregnated textile, either of cotton or of a synthetic substance such as rayon, polyamide or polyester.