Circuit for feeding pressurised fluid by two main sources and an auxiliary source

Claim 1

A circuit for feeding pressurised fluid, to at least two load elements by three sources of pressurised fluid, constituted by: a first source of pressurized fluid connected to a first load element by a first feed conduit, a first two-way distributor interposed in the first feed conduit and in a first delivery conduit, with which the first load element is provided, whilst, in its first position, said first distributor effects the continuity of the first feed conduit and the obstruction of the first delivery conduit and that in its second position, the first distributor effects the connection of said first feed and delivery conduits, a second source of pressurised fluid possibly connected to a second load element by a second feed conduit, a third source of pressurised fluid possibly connected to a third load element by a third feed conduit, a connecting member effecting the connection in parallel, on said third feed conduit, of fourth and fifth conduits, which are connected in shunt, respectively, to the first and second feed conduits, wherein the connection member is constituted as a distributor valve having at least two positions, the movable member of said valve is coupled on the one hand to a drive member, and on the other hand to an elastic element, the effects of said drive member and elastic element being antagonistic, whilst, when the drive member is actuated, its effect predominates that of the elastic element, said drive member then disposing the movable member of the valve into a first position, in which said valve effects the connection of the third feed conduit with the fifth conduit and isolates the fourth conduit from said third and fifth conduits, and that, when the elastic element acts alone, said elastic element has for its effect to dispose the movable member of the valve into a second position, in which this valve effectively assures the connection in parallel, on the third feed conduit, of the fourth and fifth conduits; finally, a link member connects the first distributor to said drive member and is such that in the second position of said first distributor there corresponds the acutation of said drive member, and that in the first position of the first distributor there corresponds the sole action of the elastic element on the movable member of the valve.