Height control valve and dump valve therefor

B - Operations – Transporting – 60 – G

Patent

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Details

B60G 11/26 (2006.01) B60G 17/052 (2006.01)

Patent

CA 2164412

A dump valve (200) for selectively placing the inlet port (16) of a height control valve (10) into communication with a source of pressurized air or atmosphere. The dump valve comprises a body (202) having a control bore (204), an opposing pilot bore (208), an exhaust bore (254) intersecting the control bore (204), and a connection bore (236) intersecting the control bore (204). The connecting bore (236) has means (53, 58) for fluidly connecting the connection bore (236) to the inlet bore (16) of a height control valve (10). A valve seal (246) disposed within the control bore (204) for reciprocal movement therein selectively places the connection port (236) in communication with either the supply port (218) or the exhaust port (254). A piston (260) axially disposed in the pilot bore (208) for reciprocal movement therein controls the movement of the valve seal (2463 in response to the selective application of pressure to the pilot bore (208).

Soupape de décharge (200) servant à placer sélectivement le point d'entrée (16) d'une soupape (10) de commande de la hauteur en communication avec une source d'air sous pression ou d'air ambiant. La soupape de décharge est constituée d'un corps (202) comprenant un trou de commande (204), un trou de guidage opposé (208), un trou de sortie (254) et un trou de connexion (236), ces deux derniers venant croiser le trou de commande (204). Le trou de connexion (236) comporte un dispositif (53, 58) qui connecte de manière fluidique le trou de connexion (236) au trou d'entrée (16) d'une soupape (10) de commande de la hauteur. Un clapet de fermeture étanche (246) placé dans le trou de commande (204) animé d'un mouvement alternatif dans ce dernier place sélectivement le point de connexion (236) en communication soit avec le point d'alimentation (218) soit avec le point de sortie (254). Un piston (260) placé axialement dans le trou de guidage (208), afin de de s'y déplacer selon un mode alternatif, commande le mouvement du clapet de fermetture étanche (246) en réponse à l'application sélective de pression sur le trou de guidage (208).

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