Hydraulic system with cooling circuit and machine tool

A hydraulic system for supplying at least one hydraulic consumer with at least one supply pump, a consumer connection, a return connection, at least one cooling circuit and a tank,

• wherein the at least one supply pump is a variable displacement pump and is connected to the tank and the consumer connection,
• wherein the return connection is connected to the tank,
• wherein the at least one cooling circuit comprises a cooling pump, a circulation cooling line connected to the tank and a heat exchanger,
• wherein the cooling pump and the heat exchanger are disposed in the circulation cooling line,
• wherein a branch line connected to the consumer connection branches off from the circulation cooling line downstream of the cooling pump and upstream of the heat exchanger,
• wherein the cooling circuit comprises a first switching valve,
• wherein the first switching valve is switchable between a closed position and an open position,
• wherein the circulation cooling line is closed in the closed position of the first switching valve, so that the cooling pump is only connected to the branch line in the closed position of the first switching valve,
• wherein the cooling pump is connected to the heat exchanger in the open position of the first switching valve, and
• wherein the at least one supply pump comprises a displacement device, and a displacement line connected to the displacement device branches off from the circulation cooling line between the first switching valve and the heat exchanger, and a bypass line connects the displacement device to the tank.