English to French Tech/Engineering Engineering (general) refuse collection vehicle

Bonjour,

Je recherche un traduction pour "annulus sides", est-ce que "les cotés du gicleur" pourrait convenir ?

Contexte :
"Pressure builds up in the ‘lower’ line to the full bore ends of the cylinders. The pressure opens the relief valves in the over-centre valves, allowing oil from the annulus sides of the cylinders to return to the tank. As the oil from the annulus side of the cylinders returns to the tank it flows through restrictors to control the lowering speed."