The valve assembly, which is designed as a stop plate, is installed between the actuator and servo-valve. Stop valves with switchable throttles are used to guarantee safe actuator speeds of ±10 mm/s. These throttles serve position monitoring.
Using these special valves during tooling mode means that it is possible to move the respective actuator safely into the required position when the safety devices are open under full operating pressure. Thanks to this performance feature, persons can stay next to the test piece safely during tooling mode, although the test bench is under normal permanent operating pressure.