Manufacturing Hydropneumatic suspension

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the whole high pressure part of system manufactured steel tubing of small diameter, connected valve control units lockheed type pipe unions special seals made desmopan rubber, type of rubber compatible lhm fluid. moving parts of system (e.g., suspension strut or steering ram) sealed contact seals between cylinder , piston tightness under pressure. other plastic/rubber parts return tubes valves such brake control or height corrector valves, catching seeping fluid around suspension push-rods. height corrector, brake master valve , steering valve spools, , hydraulic pump pistons have extremely small clearances (1–3 micrometres) cylinders, permitting low leakage rate. metal , alloy parts of system fail after excessively high mileages rubber components (especially exposed air) can harden , leak, typical failure points system.


spheres not subject mechanical wear, suffer pressure loss, due pressurised nitrogen diffusing through membrane. can, however, recharged cheaper replacing them. when citroën designed hydractive 3 suspension re-designed spheres new nylon membranes, slow rate of deflation. these recognisable grey colouring.


older, green coloured, suspension spheres typically last between 60,000 , 100,000 km. spheres once had threaded plug on top recharging. newer spheres not have plug, can retrofitted enabling them re-gassed. sphere membrane has indefinite life unless run @ low pressure, leads rupture. timely recharging, approximately every 3 years, vital. ruptured membrane means suspension loss @ attached wheel, however, ride height unaffected. no springing other (slight) flexibility of tyres, hitting pothole flat sphere can bend suspension parts or dent wheel rim. in case of main accumulator sphere failure, high pressure pump source of braking pressure front wheels. older cars had separate front brake accumulator on power steering models.


the old lhs , lhs2 (coloured red) cars used different rubber in diaphragms , seals not compatible green lhm. orange lds fluid in hydractive cars incompatible other fluids.







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