Device for regulating the supply of pressurized fluid of two circuit systems having at least two pumps of constant cubic capacity

Claim 1

Device feeding two circuit systems with pressurised fluid, constituted by: a fluid tank, a first group of pumps each with constant flow, a first of the two circuit systems, a first feed conduit connecting a first pump belonging to the first group of pumps, to the first circuit system, a first two-way distributor disposed in the first feed conduit ensuring, in its first position, the continuity of the first feed conduit and, in its second position, the communication of that part of the feed conduit included between the first pump and the first distributor with the tank, a second group of pumps each with constant outflow, the second of the two circuit systems, a second feed conduit connecting a second pump belonging to the second group of pumps, to the second circuit system, a second two-way distributor disposed in the second feed conduit ensuring, in its first position, the continuity of the second feed conduit and, in its second position, the communication of that part of the second feed conduit, included between the second pump and the second distributor with the tank, a third two-way distributor disposed in the second feed conduit between the second distributor and the second circuit system and a connecting conduit which connects the third distributor to that part of the first feed conduit included between the first distributor and the first circuit system, whilst the third distributor in its first position, establishes communication between the second distributor and the second circuit system and, in its second position, establishes communication between the second distributor and the connecting conduit and obturates that part of the second feed conduit connected directly to the second feed circuit, well as a first return member are coupled to the first distributor each of the first and second control members having an Effect opposing that of the first return member, and said latter having an effect tending to place this first distributor in its first position, whilst third and fourth control members, as well as a second return member are coupled to the second distributor each of the third and fourth control members having an effect opposing that of the second return member, and said latter having an effect tending to place this second distributor in its first position, a first control conduit connecting that part of the first feed conduit, included between the first distributor and the first circuit system to the first control member, a second control conduit connecting that part of the second feed conduit included between the second distributor and the third distributor to the second control member, an auxiliary conduit connecting that part of the first feed conduit included between the first distributor and the first circuit system to that part of the second feed conduit included between the second and third distributors, a shuttle valve disposed in said auxiliary conduit, and a third control conduit connecting that part of the second feed conduit included between the second and third distributors to the third control member, and a fourth control conduit connecting the output of the shuttle valve to the fourth control member and finally the pumps of the first and second groups of pumps are coupled to a single drive motor, the maximum power of which is lower than the sum of the maximum powers of the various pumps.