Flexible tubes for hydraulic applications

Pipes and tubular conduits – Flexible – Braided – interlaced – knitted or woven


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138125, 138126, 138141, 138177, F16L 1108




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.

patent: 2645249 (1953-07-01), Davis et al.
patent: 3420276 (1969-01-01), Skinner et al.
patent: 3561493 (1971-02-01), Maillord et al.
patent: 3830261 (1974-08-01), Hochberg et al.
patent: 3927233 (1975-12-01), Naidoff
patent: 3944453 (1976-03-01), Chudgar et al.


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