Pilot relay valve including means to control flow through a...

Details Pilot relay valve including means to control flow through a... Pilot relay valve including means to control flow through a...

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 15/18 (2006.01) B60T 15/18 (2006.01) F16K 31/363 (2006.01)

Patent

CA 2255953

A pilot operated relay valve (10) for an air pressure braking system includes a relay piston (16) which is responsive to the pressure at a control port (20) to open the valve (10) so that its inlet port (38) is in free communication with its outlet port (24). The relay piston ( 16) includes a balance orifice (26) which permits the outlet port (24) to communicate with the control port (20) to equalize or balance the pressure differential therebetween. A shut off valve arrangement (80, 82) or a check value (90 or 92) is provided to shut off or control flow through the balance orifice during rapid release modulation of the pressure signal for braking applied to the control port (20).

Une servo-valve (10) pour un système de freinage à pression d'air comprend un piston de relai (16) qui est sensible à la pression au niveau d'un orifice ou port de commande (20) pour ouvrir la valve (10) de sorte que son port d'admission (38) se trouve en communication libre avec son port de sortie (24). Le piston (16) comprend un orifice d'équilibrage (26) qui permet au port de sortie (24) de communiquer avec le port de commande (20) afin d'égaliser ou équilibrer le différentiel de pression entre les deux. Une soupape de coupure (80, 82) ou une soupape de retenue (90 ou 92) est prévue pour couper ou réguler l'écoulement passant par l'orifice d'équilibrage lors de la modulation à libération rapide du signal de pression de freinage appliqué au port de commande (20).

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