Electrohydraulic valve control

摘要

The controller (1) has an electrically energizable hydraulic valve (11) arranged in a control line (7), where the valve forms a connection from a pressure chamber (6) to a pressure relief chamber (8) when the valve is in a non-energized state, and interrupts the connection when the valve is in an energized state. Another valve (12) is arranged in the line such that the connection is formed from the pressure chamber to a hydraulic fluid supply (10), and connection from the fluid supply to the pressure relief chamber is interrupted when an error occurs during opening the former valve.