Hydraulic valve block and hydraulic unit for closed circuit applications

A hydraulic valve block for a hydraulic unit provided to be used in a closed hydraulic circuit application, comprising a high pressure port, a low pressure port, a pilot valve having a pilot valve spool, and a bypass valve having a bypass valve spool, wherein

• the pilot valve is connected with a pilot valve inlet to the high pressure port, with a discharge port to an discharge area and with a control outlet to a control line, the pilot valve spool is held in an initial position in which the control line is connected to the discharge area by means of a pilot valve spring acting on its first front face, wherein the pilot valve spool can slide into a shifted position and pressure from the pilot valve inlet can be conducted to the control line by means of a force, whose strength of force depends on the pressure level at the low pressure port acting on the second front face of the pilot valve spool against the force of the pilot valve spring;
• the bypass valve spool comprises a first opening front face connected to the high pressure port and a closing front face to which the control line is connected to and on which a bypass valve spring acts in closing direction,
• wherein the bypass valve can be switched from a closed position in which a fluid connection between the high pressure port and low pressure port is disabled, to an open position in which a fluid connection between the high pressure port and the low pressure port is enabled, if an opening force exerted by the high pressure on the first opening front face of the bypass valve spool is higher than the sum of closing forces on the closing front face exerted by the pressure in the control line and the force of the bypass valve spring.