Spring brake modulating relay valve

Details Spring brake modulating relay valve Spring brake modulating relay valve

B - Operations, Transporting

60

T

B60T 13/26 (2006.01) B60T 15/20 (2006.01) B60T 15/24 (2006.01)

Patent

CA 2409608

A combined spring brake modulating relay valve integrates the functions of a relay valve and a modulating valve. The housing includes a valve assembly movable in response to air pressure provided to selected ports in the housing. A relay piston selectively communicates with a control port and a primary brake circuit port. A modulating piston includes surfaces selectively pressurized by the primary brake circuit port and a secondary brake circuit port. This modulates the pressure from the delivery port to thereby selectively apply the associated spring brakes if a failure is detected at the primary brake circuit port. The exhaust member selectively controls communication between the supply and delivery ports as necessary.

L'invention concerne une valve-relais d'inversion du frein à ressort combinée intégrant les fonctions d'une valve relais et d'une valve modulatrice. Le logement comporte une ensemble valve mobile en réponse à la pression d'air appliquée sur des orifices choisis du logement. Un piston relais communique de manière sélective avec un orifice de commande et un orifice de circuit de freins primaires. Un piston modulateur comprend des surfaces pressurisées de manière sélective par l'orifice de circuit de freins primaires et l'orifice de circuit de freins secondaires, ce qui permet de moduler la pression fournie par l'orifice de distribution afin d'activer de manière sélective les freins à ressort associés si une panne est détectée au niveau de l'orifice de circuit de freins primaires. L'élément d'échappement commande de manière sélective la communication entre les ports d'alimentation et de distribution selon les besoins.

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