Flexible hose for conveying fluids or gases

1. A flexible hose adapted for conveying fluids or gases under pressure, said hose extending in an axial direction along a central longitudinal axis and in a radial direction circumferentially about said longitudinal axis, said hose comprising in order

a core tube ( 2 ) having a circumferential inner core tube surface and an opposing circumferential outer core tube surface, said core tube ( 2 ) comprising a first elastomeric layer,

a reinforcement layer ( 3 ) surrounding the outer core tube having a circumferential inner core reinforcement surface and an opposing circumferential outer core reinforcement surface,

said reinforcement layer ( 3 ) being of knitted, spiral wound, or braided construction,

said reinforcement layer ( 3 ) formed from at least one yarn ( 5 ),

said yarn ( 5 ) having a linear density from 1000 to 4000 dtex,

said yarn ( 5 ) composed of 2 to 5 yarn strands ( 6 ),

said yarn strands ( 6 ) being ply-twisted to 1 to 5 twist multiplier,

said yarn strands ( 6 ) composed of 1 to 5 spun yarns ( 7 ),

said spun yarns ( 7 ) being ply-twisted to 1 to 5 twist multiplier,

said spun yarns ( 7 ) comprising a linear density from 100 dtex to 1000 dtex,

said spun yarns ( 7 ) comprising filaments having a length from 80 to 150 mm,

said spun yarns ( 7 ) comprising a twist of at least 200 turns per meter, and

said spun yarns ( 7 ) comprising filaments selected from the group consisting of poly m-phenylene terephthalamide, poly methylene-1,3-benzobisoxazole, polyoxadiazole, polysulfonamide, polyarylene sulfide, polybenzimidazole, polybenzthiazole, polybenzoxaole, or mixtures thereof, and

a second elastomeric layer ( 4 ) surrounding said reinforcement layer ( 3 ) on said circumferential outer core reinforcement surface.

2. A flexible hose adapted for conveying fluids or gases under pressure according to claim 1 with said reinforcement layer ( 3 ) comprises poly m-phenylene terephthalamide or polyarylene sulfide or mixtures thereof.

3. A flexible hose adapted for conveying fluids or gases under pressure according to claim 1 where said yarns ( 5 ), yarn strands ( 6 ) or spun yarns ( 7 ) are coated with a finish.

4. A flexible hose adapted for conveying fluids under pressure according to claim 1 where said elastomeric material comprises hydrogenated nitrile rubber, silicone rubber, fluorosilicone rubber, methylphenylsilicone rubber, natural rubber, EPDM, CPE or acrylic rubber.

5. A flexible hose adapted for conveying fluids or gases under pressure according to claim 1 comprising two or more said reinforcement layers ( 3 ).

6. A flexible hose adapted for conveying fluids or gases under pressure according to claim 1 where said core tube ( 2 ) is lined with a fluorocarbon based material.

7. A flexible hose adapted for conveying fluids under pressure according claim 1 where said reinforcement layers ( 3 ) are knitted.

8. A flexible hose adapted for conveying fluids under pressure according claim 7 where said first reinforcement layer has 160 to 660 loops per meter.