Hydraulic circuit including a hydraulic machine drain provided with a flow-control means and fluid-treatment functions

A hydraulic circuit having at least one hydraulic power machine connected to a low-pressure circuit and to a high-pressure circuit transmitting hydraulic power, the at least one hydraulic machine having a casing and being equipped with a drain which allows an internal leakage in said casing to flow to a low pressure accumulator or a reservoir at atmospheric pressure, said hydraulic circuit comprising an intake pipe connecting the low pressure circuit to the casing of said at least one hydraulic machine and an outlet pipe forming the drain receiving the flow of the intake pipe to conduct the flow to the low pressure accumulator or the reservoir at atmospheric pressure, the drain comprising a heat exchanger and a filter which define fluid processing elements for the entire hydraulic circuit, the hydraulic circuit further comprising a flow control means in the intake and outlet pipes, the low pressure circuit comprising said low pressure accumulator, said flow control means comprising a motorized pump arranged along the outlet pipe which discharges into the low pressure accumulator.