vanne de commande

OBS: vanne de commande : terme uniformisé par le Comité d'uniformisation de la terminologie aéronautique (CUTA) - Maintenance.
PHR: Vanne de commande de débit, de décharge, de démarrage, de pression, d'ouverture de trappe de train principal.

CONT: Pneumatic systems are often compared to hydraulic systems, but such comparisons can only hold true in general terms. ... Control valves are ... a necessary part of a typical pneumatic system. ... The control valve consists of a lever with two lobes. [In the off position], a spring holds the left poppet closed so that compressed air entering the pressure port cannot flow to the brakes. [In the on position], one lobe of the lever holds the left poppet open and a spring closes the right poppet. Compressed air now flows around the opened left poppet, through a drilled passage, and into a chamber below the right poppet. Since the right poppet is closed, the high-pressure air flows out of the brake port and into the brake line to apply the brakes. To release the brakes, the control valve is returned to the off position.