Pressure-maintaining valve arrangement for a purge circuit of a closed hydraulic circuit

A pressure-maintaining valve arrangement for a purge circuit of a closed hydraulic circuit, comprising:

• a pilot valve including a valve body and an inlet of the pilot valve;
• a pressure-maintaining valve including a valve housing and a valve body located at least partially within the valve housing, the valve housing of the pressure-maintaining valve defining an inlet of the pressure-maintaining valve, and the valve body of the pressure-maintaining valve defining a nozzle located downstream of the inlet of the pressure-maintaining valve, the nozzle configured to receive an inlet pressure from the inlet of the pressure-maintaining valve and to output a nozzle pressure downstream of the nozzle, the valve body of the pressure-maintaining valve configured to be acted upon in a closing direction by a force of a spring and in an opening direction by the nozzle pressure,
• wherein the inlet pressure from the inlet of the pressure-maintaining valve is upstream of the nozzle,
• wherein a first channel portion of an inlet channel extends directly from the inlet of the pressure-maintaining valve to the inlet of the pilot valve to connect directly the inlet of the pilot valve to the inlet pressure from the pressure-maintaining valve,
• wherein inlet of the pilot valve is upstream of the nozzle,
• wherein the valve body of the pressure-maintaining valve defines an inner inlet pressure chamber that is downstream of the nozzle,
• wherein a control surface on the valve body of the pressure-maintaining valve is located in a control pressure chamber that is spaced apart from the inner inlet pressure chamber,
• wherein the control surface is acted upon by the inlet pressure of the pressure-maintaining valve in a first position of the valve body of the pilot valve, and
• wherein the control pressure chamber is relieved to a tank connection of the pressure-maintaining valve in a second position of the valve body of the pilot valve.