High pressure valve for railway car brake control valve device

Details High pressure valve for railway car brake control valve device High pressure valve for railway car brake control valve device

B - Operations, Transporting

60

T

B60T 15/42 (2006.01)

Patent

CA 2109379

A spool type valve arrangement in which a booster spring is employed to overcome static friction of the spool valve O-rings and thereby assure prompt actuation of the spool valve member. The arrangement is such that the booster spring is only active through a limited distance of travel from release position toward application position, this limited distance of spool valve travel being selected so as to occur prior to any transition of the port connections controlled by the spool valve. In this manner, the spool valve return spring force need not be increased in order to reset the spool valve sufficiently to re-establish the original spool valve port connections.

Mécanisme de distributeur à tiroir cylindrique faisant appel à un ressort renforçateur pour vaincre l'adhérence des joints toriques de ce distributeur à tiroir cylindrique et en assurer la mise en action rapide. Ce mécanisme fonctionne de telle façon que le ressort du surpresseur n'est actif que sur une distance de déplacement limitée entre sa position non tendue et sa position d'utilisation, cette distance de déplacement limitée du distributeur à tiroir cylindrique étant choisie de telle manière qu'elle puisse être parcourue avant toute transition des raccordements de l'orifice commandés par le distributeur à tiroir cylindrique. De cette façon, il n'est pas nécessaire d'augmenter la force du ressort de retour du distributeur à tiroir cylindrique pour obtenir un réenclenchement suffisant au rétablissement des raccordements originaux de son orifice.

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