Hydraulic machine having two cylinder capacities and a safety valve

A hydraulic machine comprising at least two active operating cylinder capacities and suitable for being connected to two main ducts, respectively a main feed duct and a main discharge duct, the machine comprising:

• two series of distribution ducts, each of which has first and second groups of distribution ducts, the first group of distribution ducts of the first series being connected to a first enclosure, the second groups of distribution ducts of the first and second series being connected to a second enclosure, and the first group of distribution ducts of the second series being connected to a third enclosure;
• a cylinder-capacity selector suitable for being caused to take up a large cylinder capacity configuration of the at least two active operating cylinder capacities in which the second enclosure is connected to one of the main ducts, while the first and third enclosures are connected to the other main duct, and a small cylinder capacity configuration of the at least two active operating cylinder capacities in which the second and third enclosures are connected to said at least one of the main ducts, while the first enclosure is connected to said other main duct, said large cylinder capacity configuration and small cylinder capacity configuration of the cylinder-capacity selector being different configurations of said cylinder-capacity selector;
• and
• a safety valve having at least a first port fluidly connected to said one of the main ducts, and a second port fluidly connected to the third enclosure, said safety valve being suitable, when the cylinder-capacity selector is caused to go into the large cylinder capacity configuration, for being caused to go into a first configuration in which the first and second ports are isolated from each other, and, when the cylinder-capacity selector is caused to go into the small cylinder capacity configuration, for being caused to go into a second configuration in which the first and second ports are interconnected, the first port of the safety valve being fluidly connected to said one of the main ducts in said first and second configurations of the safety valve.