Hydraulic circuit

Abstract

A hydraulic circuit comprising a high-pressure connection, a low-pressure connection, a supply unit, and a pump system. The low-pressure connection is fluidically connected to the high-pressure connection by a series circuit of the supply unit and the pump system. The pump system has a pump for conveying a fluid, a shaft for driving the pump, and a stop-check valve system. In a first state, the pump conveys the fluid from a first pump connection to a second pump connection through the check valve to the high-pressure connection. In a second state, the pump conveys the fluid from the second pump connection to the first pump connection and to a control connection of the check valve. The check valve prevents a fluid flow from the high-pressure connection to the first pump connection and allows a fluid flow from the first pump connection to the high-pressure connection. A fluid flow from the high-pressure connection to the first pump connection can be enabled via the control connection. The supply unit is configured to allow a fluid flow from the low-pressure connection to the pump connection which is drawing in and to prevent a fluid flow from the ejecting pump connection to the low-pressure connection. The pump has a leakage flow towards the shaft when the fluid is conveyed. The shaft is connected to the low-pressure connection by a pressure equalization line in order to conduct the fluid away from the shaft.