A hydraulic actuator device for a hydraulic system filled with an electrically conductive medium, the hydraulic actuator device being situatable or being situated on and/or in the hydraulic system, and including at least one actuator module, which in each case is designed in such a way that at least a portion of the electrically conductive medium is acceleratable into at least one partial volume of the hydraulic system due to its interaction with an electrical current flow generated with the aid of the respective actuator module and/or with a magnetic field created with the aid of the respective actuator module, as a result of which a pressure build-up is creatable in the at least one partial volume of the hydraulic system.

A hydraulic actuator device for a hydraulic system filled with an electrically conductive medium, the hydraulic actuator device being situatable or being situated on and/or in the hydraulic system, and including at least one actuator module, which in each case is designed in such a way that at least a portion of the electrically conductive medium is acceleratable into at least one partial volume of the hydraulic system due to its interaction with an electrical current flow generated with the aid of the respective actuator module and/or with a magnetic field created with the aid of the respective actuator module, as a result of which a pressure build-up is creatable in the at least one partial volume of the hydraulic system.

The disclosure provides a method for testing a solenoid valve for triggering a safety valve having a single-acting fluidic drive and a positioner. The drive fluid pressure is increased by a first pressure difference. An attempt is made to switch the solenoid valve to the safety position. The drive fluid pressure is measured at a specified point in time that is selected such that the pressure in the drive fluid lowers at most by the first pressure difference. If the pressure in the drive fluid is higher than a reference pressure at the specified point in time, the functionality test of the solenoid valve is failed. The lowering of the pressure in the drive fluid is monitored over a defined period of time to make conclusions regarding the pressure generating system. The pressure does not fall below the operating pressure so the position of the valve member remains constant.

A safety valve is provided with an electronic control unit for generating a control voltage. An electro-fluidic preliminary stage has a piezo bending actuator which can be actuated between a working position and a safety position by the control voltage and influences the flow of a secondary control fluid flow depending on its position. A fluid-mechanical main stage has an influencing device for influencing the flow of a primary working fluid flow. The influencing device can be actuated by means of the secondary control fluid flow which flows into a control chamber of the main stage. The control unit caries out a test of the preliminary stage repeatedly in an iterative manner after the expiration of a specified time interval. As part of the functionality test, the position of the piezo bending actuator is changed slightly by varying the control voltage.

A safety valve is provided with an electronic control unit for generating a control voltage. An electro-fluidic preliminary stage has a piezo bending actuator which can be actuated between a working position and a safety position by the control voltage and influences the flow of a secondary control fluid flow depending on its position. A fluid-mechanical main stage has an influencing device for influencing the flow of a primary working fluid flow. The influencing device can be actuated by means of the secondary control fluid flow which flows into a control chamber of the main stage. The control unit caries out a test of the preliminary stage repeatedly in an iterative manner after the expiration of a specified time interval. As part of the functionality test, the position of the piezo bending actuator is changed slightly by varying the control voltage.

A system includes a mounting panel having diffusion-bonded metal plates that form a reservoir to contain a process fluid, multiple channels through which to flow the process fluid, and vias through which to flow the process fluid to and from process fluid control components attached to the mounting panel. At least a pair of the multiple channels are connected with the reservoir. A temperature sensor is attached to a top of the mounting panel, the temperature sensor in fluid communication with the reservoir through one of the vias. A set of inlet ports are attached to the mounting panel, the set of inlet ports to receive the process fluid. At least one outlet port is attached to the mounting panel, the at least one outlet port to output the process fluid from the mounting panel.

Provided is an arrangement and a method to detect an oil leakage between a first section and a second section of a hydraulic cylinder. A movable piston is arranged between the first and second section in a way that the piston changes position between the sections. The change in position is done in dependency of a difference between a first force, which acts at the first section on a first cross sectional area of the piston, and a second force, which acts at the second section on a second cross sectional area of the piston. The first section comprises hydraulic oil with a predefined first pressure, while the first force is calculated based on this pressure and based on the first area. The second section comprises hydraulic oil with a predefined second pressure, while the second force is calculated based on this pressure and based on the second area.

Systems and methods of flow testing different workpieces in an automated testing station are described. Each workpiece comprises a flow path from an inlet to an outlet and the automated testing station comprises first and second sealing heads for injecting gas into the inlets of workpieces and collecting gas from the outlets of workpieces. The method includes performing a flow test by moving the flow test heads toward the workpieces while at the same time priming a flow of gas from the first sealing heads to the second sealing heads, prior to engaging the workpiece.

Systems, methods, and computer-readable media for enhancing the reliability of a pneumatically driven surgical tool by providing a redundant, backup pneumatic circuit for supplying the surgical tool with pneumatic pressure at a normal pressure.

A method for operating a hydraulic valve of a hydraulic device of a motor vehicle transmission device, wherein an actuating current of the hydraulic valve is superposed with a modulation alternating current in order to adjust a shaking vibration of the hydraulic valve by a control device, wherein a deviation between an actual pressure resulting from the actuating current and a setpoint pressure determined as a function of the actuating current is determined for the hydraulic device by means of an electronic computing device, and an amplitude and/or a frequency of the modulation alternating current is increased as compared to a starting value equalizing a hysteresis of the actual pressure relative to the setpoint pressure, as a function of a tolerance range being exceeded by the determined deviation.