Valve arrangement with pressure balance

F - Mech Eng,Light,Heat,Weapons – 15 – B

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F15B 11/05 (2006.01)

Patent

CA 2269593

The invention concerns a valve arrangement (1) for supplying, in a manner adapted to the pressure and volume flow, at least one consumer which, via two working connections (A1, B1, A2, B2) of a constantly adjustable directional control valve (4, 6), can be supplied with hydraulic fluid or connected to a tank (T). Associated with the two working connections (A1, B1, A2, B2) of the valve arrangement (1) is a common pressure balance (16, 18) whose piston (66) is guided in an axially displaceable manner in an axial bore (32) in the directional control valve slide (12) such that, when the directional control valve (4, 6) is suitably triggered, one of the two working connections (A1, B1, A2, B2) can be connected alternatively to the pump connection (P). A control pressure (25), which corresponds, for example, to the highest system load pressure, the individual load pressure or a pressure derived therefrom, acts on both end faces of the directional control valve slide (12) and on the spring side of the pressure balance piston (66).

L'invention concerne un système de soupapes (1) destiné à alimenter de manière adaptée en termes de flux de pression et de flux volumique, au moins un consommateur pouvant être alimenté en fluide hydraulique par l'intermédiaire de deux connexions de travail (A1, A2, B1, A2, B2) d'un distributeur (4, 6) ajustable en continu ou être relié à un réservoir (T). Une balance de pression (16, 18) commune est associée aux deux connexions de travail (A1, B1, A2, B2) du système de soupapes (1). Le piston (66) de cette balance de pression (16, 18) est guidé dans un alésage axial (32) du tiroir (12) du distributeur de manière à coulisser dans le sens axial, afin qu'avec un pilotage approprié du distributeur (4, 6), une des deux connexions de travail (A1, B1, A2, B2) du distributeur (4, 6) puisse être reliée au choix, au raccord de pompe (P). Une pression de commande (25) correspondant par exemple à la pression de charge la plus élevée du système, à la pression de charge individuelle ou à une pression qui en est dérivée, agit sur les deux faces du tiroir (12) du distributeur et sur la face à effet ressort du piston (66) de la balance de pression.

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