A controller and related system and method for controlling a choke for choking fluid flow are configured to take into account non-linear behaviors of the choke, to allow more accurate and effective control of the choke. To obtain a desired pressure drop across a choke valve, the controller is configured to monitor the position of a choke actuator coupled to the choke valve and the pressure at the inlet of the choke valve. The controller calculates an adaptive proportional gain coefficient, and optionally adaptive integral and derivative coefficients, based on the choke actuator position, to help mitigate the effects of non-linear behaviors of the choke and, where necessary, based on the inlet pressure, the controller calculates an augmentation correction to address any instability in the choke. The controller then commands the choke actuator accordingly to adjust the flow area through the choke valve.

A process control device has an electropneumatic control unit which is used for activating a pneumatic actuating drive. The control unit has a fastening module by means of which it is fastened to a drive housing of the actuating drive. The control unit includes an interface plate which is separate from the fastening module, is mounted on a top side of the fastening module and is fluidically connected, through the fastening module, to the actuating drive. The control unit includes an electrically actuatable control valve device which is fixed to the fastening module by being mounted on the interface plate fixed to the fastening module. In this way, a process control device can be produced in an easily and variably configurable manner.

This invention regards a hydraulic turbine (1) to operate in pressure circuits, where there is a flow of a fluid, to control the flow and pressure downstream the installation point. Even so, said turbine (1) can generate power for itself based on the difference of pressure and flow, as the remaining power can be used in public power networks or isolated. Its application field comprises sanitation companies, beverage industries, paper and cellulose industries, petrochemical companies or any places, where it is needed to control the flow and pressure in supply networks.

A controller and related system and method for controlling a choke for choking fluid flow are configured to take into account non-linear behaviors of the choke, to allow more accurate and effective control of the choke. To obtain a desired pressure drop across a choke valve, the controller is configured to monitor the position of a choke actuator coupled to the choke valve and the pressure at the inlet of the choke valve. The controller calculates an adaptive proportional gain coefficient, and optionally adaptive integral and derivative coefficients, based on the choke actuator position, to help mitigate the effects of non-linear behaviors of the choke and, where necessary, based on the inlet pressure, the controller calculates an augmentation correction to address any instability in the choke. The controller then commands the choke actuator accordingly to adjust the flow area through the choke valve.

In some examples, a device includes a fluidic circuit may be configured to receive a fluidic input (and optionally a fluidic bias) and to provide a fluidic output based on the fluidic input. In some examples, the fluidic output may be a fluidic difference output based on a difference (such as a pressure and/or flow difference) between the fluidic input and a fluidic bias. In some examples, a device includes a fluidic amplifier configured to receive the fluidic difference output, and to provide a device fluidic output based on the fluidic difference output. The device fluidic output may be provided to a fluidic load, which may include an actuator and/or a haptic device.

In some examples, a device includes a fluidic circuit may be configured to receive a fluidic input (and optionally a fluidic bias) and to provide a fluidic output based on the fluidic input. In some examples, the fluidic output may be a fluidic difference output based on a difference (such as a pressure and/or flow difference) between the fluidic input and a fluidic bias. In some examples, a device includes a fluidic amplifier configured to receive the fluidic difference output, and to provide a device fluidic output based on the fluidic difference output. The device fluidic output may be provided to a fluidic load, which may include an actuator and/or a haptic device.

High strain hydraulically amplified self-healing electrostatic transducers having increased maximum theoretical and practical strains are disclosed. In particular, the actuators include electrode configurations having a zipping front created by the attraction of the electrodes that is configured orthogonally to a strain axis along which the actuators. This configuration produces increased strains. In turn, various form factors for the actuator configuration are presented including an artificial circular muscle and a strain amplifying pulley system. Other actuator configurations are contemplated that include independent and opposed electrode pairs to create cyclic activation, hybrid electrode configurations, and use of strain limiting layers for controlled deflection of the actuator.

A process control device has an electropneumatic control unit which is used for activating a pneumatic actuating drive. The control unit has a fastening module by means of which it is fastened to a drive housing of the actuating drive. The control unit includes an interface plate which is separate from the fastening module, is mounted on a top side of the fastening module and is fluidically connected, through the fastening module, to the actuating drive. The control unit includes an electrically actuatable control valve device which is fixed to the fastening module by being mounted on the interface plate fixed to the fastening module. In this way, a process control device can be produced in an easily and variably configurable manner.

An adjustable electro-pneumatic converter or transducer based on the nozzle/baffle plate principle is proposed. A defined roughness (Rz) of the baffle plate surface can prevent the occurrence of Bernoulli forces at output pressures close to the initial pressure, i.e. when the exhaust nozzle (140) is almost completely closed by the baffle plate (100). The system thus becomes more dynamically controllable under these conditions. Such a converter can be used to control any consumer system, e.g. air power amplifiers for electro-pneumatic positioners.

To be able to set a spring force of a first simulator spring of a pedal travel simulator of a hydraulic power vehicle braking system, a stroke limiter is provided, which is situated between a simulator piston and the simulator spring, including two rams projecting in opposite directions as stops, which are plastically compressed for setting the spring force. To set a jump-in, the stroke limiter includes laterally projecting, plastically bendable wings as supports for a second simulator spring, which is situated between the stroke limiter and the simulator piston.