Abstract: In a method for the encryption communication in a process plant, one or more keys for coding of electronic signals regarding the process plant, such as actuation signals, measurement signals, state signals, warning signals or such, are provided. The one or more keys are transmitted as acoustic signal via a ductwork guiding plant fluid, particularly a process fluid or an auxiliary fluid, from the first communication partner to the second communication partner. The process plant can be a chemical plant, a power plant, or a food-processing plant. The communication can be between a first and a second communication partner, which can include at least one field device, such as an actuator for adjusting a process fluid and/or a control electronics for supervising, controlling and/or regulating processes of the process plant.

Abstract: An electric actuator for a final controlling device having a safety actuator function for positioning an actuating element (e.g. a valve element of, for example, a process-technical plant). The electric actuator can include an electric motor configured to provide a torque for actuating the actuating element. The electric motor can include a motor shaft configured to deliver the torque, an output shaft configured to transmit the torque from the electric motor to the actuating element, and an electromagnetic and/or currentlessly uncoupling coupling (e.g. electromagnetic and/or currentlessly uncoupling clutch) configured to provide and/or interrupt a torque-transmitting connection between the motor shaft and the output shaft. The output shaft, the motor shaft and the coupling can be arranged coaxially to one another.

Abstract: A system to determine a real process parameter of a real field device in a real flow route of a process plant can include an interface and a virtual twin flow route that may virtually represent the real flow route. A twin process fluid flow is virtually influenced according to a twin influence factor. The virtual twin flow route may: receive, via the interface, a real initial parameter of the real process fluid flow and/or of the real field device, and virtually determine, fluid flow upstream or downstream, a twin process parameter of the twin field device corresponding to the real field device using the at least one twin influence factor, the virtually determined twin process parameter being supplied to the at least one real field device as the to be determined real process parameter for further influencing the real process fluid flow.

Abstract: A communication device for control interaction between operating electronics and an actuator to set a process fluid flow of a process-engineering plant can include a first communication interface configured to receive electrical signals from the operating electronics, a second communication interface configured to provide electrical actuator commands to the actuator, and a permissibility processor having a data memory that stores permissible actuator commands, the permissibility processor being configured to cause the second communication interface to provide one of the permissible actuator commands to the actuator based on an electrical signal of the electrical signals received via the first communication interface.

Abstract: Control valve assembly for controlling a process fluid flow in a process engineering plant such as a power plant, a chemical plant, a food processing plant or the like, wherein at least one fine-adjustment poppet valve with a fine-adjustment drive for the fine adjustment of a fine-adjustment poppet valve flow area; and at least one open/close poppet valve having a discrete adjustment actuator for placing the open/close poppet valve either into an open position, in which a poppet valve flow area is completely open, or into a closed position, in which the poppet valve flow area is closed off, wherein a cumulative total flow area of the adjustment valve assembly is defined by the fine-adjustment poppet valve flow area of the at least one fine-adjustment poppet valve and by the poppet valve flow area of the at least one open/close poppet valve.

Abstract: In a method for spatially arranging at least one sensor array in a measuring channel, a predetermined desired geometry of the measuring channel is provided; a desired sensor-array arrangement associated with the desired geometry of the measuring channel is provided, where the sensor-array arrangement includes spatially-defined positioning parameters and orienting parameters in regard to the sensor components; an actual geometry of the measuring channel is captured; it is determined if a positioning parameter or an orienting parameter is outside of an admissible value range in relation to the actual geometry of the measuring channel, and the at least two sensor components of the sensor array are arranged in the measuring channel according to a most-current desired-sensor-array arrangement.

Abstract: 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.

Abstract: The invention relates to a control valve (10) for a process plant, comprising an actuator (16) which is connected to, and spaced from, a valve body (12) of a valve unit (11) via a yoke (14), the valve body (12) having a housing flange (32) which is detachably connected to the yoke (14), with the valve body (12) having an inlet (20) and an outlet (22) adapted to allow the flow of a process fluid therethrough, which inlet (20) and outlet (22) are each arranged in a fluid connection region (18, 19), and with an actuating member adapted to be displaced by the actuator (16) for controlling the flow rate of the process fluid being arranged in the passage (24) from the inlet (20) to the outlet (22). The invention is characterized in that the housing flange (32) connected to the yoke (14) has at least one recess (44) as well as a yoke fastening region (33), with the yoke fastening region (33) being formed as a bolt hole circle (34) with radially arranged connecting holes (36).

Abstract: In a diagnostic method for a positioning device of a process plant, such as a chemical plant, a food processing plant or the like, which includes an actuator (e.g. pneumatic or electric actuator) with a drive shaft and a positioning armature, such as an actuator valve, with a positioning shaft, the drive shaft and the positioning shaft being connected to each other in a rotationally fixed manner (e.g. by a detachable coupling interface and/or a positive-locking torque coupling, such as a claw coupling), wherein a first measurement signal is detected during a movement of the drive shaft, and the first measurement signal or a derivative of the first measurement signal is evaluated with respect to a step-like change in order to detect a rotational backlash.

Abstract: A valve component includes a valve housing having a passage extending along a longitudinal axis; a valve component mountable on the valve housing; a seal to circumferentially seal between the valve housing and the valve component; and a contact abutment to be disposed in the axial direction between the seal and valve housing, and which is configured to be movable in a pre-assembled state relative to the valve housing and the valve component. In an assembled state, the seal can be inserted into an annular-groove-shaped seal receptacle limited by the valve component, valve housing, and contact abutment. The valve housing, valve component, and contact abutment can be matched to each other such that the seal receptacle is reduced when the valve component is mounted on the valve housing, the contact abutment being supported on the valve housing. The contact abutment can undergo a relative movement relative to the valve component.

Abstract: In a throttle body for reducing the fluid pressure, particularly at a control valve, preferably for arranging in a process fluid line, of a process plant, such as a chemical plant, particularly a petrochemical plant, a power plant, a brewery or the like, with a plurality of channels extending from an upstream channel inlet to a downstream channel outlet, it is foreseen that an at least section-wise curved course of at least one of the plurality of channels between the channel inlet and the channel outlet deviates from a two-dimensional extension.

Abstract: A method is detect inadequate valve seat integrity in a control element of a control valve is proposed, wherein during a calibration time interval the position of the control element of the control valve in the closed position are repeatedly measured and recorded. Measuring of the position in the closed position continues during operation, and a moving average value is determined over a specified number of values. A threshold is determined from the calibration data set and the specified number. If the moving average deviates from the average of the calibration data by more than this threshold, a message is output. In particular, no additional sensors or scanning devices are required and a sensible compromise between early fault detection and avoidance of false diagnoses is achieved.

Abstract: An arrangement for a globe valve for adjusting a process fluid can include a valve housing having an inlet and an outlet connected by a passage, a valve cage to linearly guide a valve member of the globe valve in an axial direction, and a position lock (securing device). The valve cage can include a passage channel(s) extending transversely in the axial direction. The valve cage can be arranged in the valve housing where: the valve cage circumferentially surrounds the passage opening with respect to the axial direction, and a radial outer side of the valve cage with respect to the axial direction is in contact with a radial inner side of the valve housing with respect to the axial direction. The position lock fixes a relative position of the valve cage relative to the valve housing and arranged on the radial outer side and/or on the radial inner side.

Abstract: A control valve configured to set a process fluid stream of a processing plant can include a valve housing, a valve component, an annular-groove-shaped seal reception, and a seal. The valve housing can include an inlet, an outlet and an aperture extending between the inlet and the outlet along a longitudinal axis. The valve component can be mounted on the valve housing and can be a valve seat and/or a valve cage. The annular-groove-shaped seal reception can be confined by the valve component and the valve housing. The seal can be fit into the seal reception. The valve component and the valve housing can each form a respective ledge protruding in a radial direction to define the annular-groove-shaped seal reception. The ledges can each be configured to confine the seal reception in a respective axial direction.

Abstract: A pneumatic valve arrangement for a pneumatically operated field device, such as a control device, of a processing plant, such as a chemical plant, a foodstuff processing plant, a power plant or the like is disclosed. The valve arrangement may include an air supply conduit for receiving pressurized air from a source of pressurized air, a control air conduit for aerating and venting a pneumatic actor of the field device, and a venting conduit for discharging pressurized air to a pressure sink, such as the atmosphere; a venting valve for opening and/or closing the venting conduit and an aerating valve for opening and/or closing the air supply conduit; and a pivotable carrier lever for common actuation of the aerating valve and of the venting valve, wherein the carrier lever holds the venting valve in its closed position while it opens the aerating valve from its closed position.

Abstract: The invention relates to a valve seat and cage assembly (18) comprising a valve cage (20) and a valve seat (22), the valve seat (22) being adapted to be screwed into the valve cage (20), which valve cage (20), in a connection portion (34) thereof, has a valve cage connection inner diameter (DK) in which the connection portion (32) of a valve seat (22) engages with its valve seat connection outer diameter (DV) and thus provides radial centering, a screw connection portion (37) and a shoulder (38), with the shoulder (38) serving as an axial stop between the valve cage and the valve seat, and with the valve seat (22) and the valve cage (20) being pressed against one another with an axial contact pressure component.

Abstract: An electromagnetic impact valve arrangement for a pneumatically operated field device of a processing plant, such as a chemical plant, a food-processing plant, a power plant can include an air chamber into which three air conduits lead. The three air conduits can include an air supply conduit to receive compressed air from a compressed air supply source, a control air conduit to aerate and vent a pneumatic actuator of the field device, and a venting conduit to output compressed air to a pressure sink, such as the atmosphere. The impact valve arrangement can also include a first electromagnetic impact valve (“aeration impact valve”) to open and/or close the air supply conduit and a second electromagnetic impact valve (“ventilation impact valve”) to open and/or close the venting conduit. The first impact valve and the second impact valve can be electromagnetically coupled to one another.

Abstract: An electropneumatic solenoid valve for a pneumatically-actuated field device can include air channels, a flapper valve member, an electromagnetic controller, and a spring. An air supply channel, air dispensing channel and air exhaust channel can be mound into an air chamber. The flapper valve member can include a closure element arranged on an axial control direction and be engageable with a delimitation interior wall mouth of one of the air channels such that the flapper valve member is arranged with a circumferential axial distance to the delimitation interior wall. The electromagnetic controller can displace the flapper valve member in the axial control direction to ventilate/exhaust the air dispensing channel. The spring can bias the flapper valve member into a closed position to close closing the one of the air channels. The flapper valve member can be float-mounted in an unguided configuration except for spring within the air chamber.

Abstract: In a closed loop control method for an electropneumatic field device, an electronic target value input of a command variable corresponding to a target value of a control center is received by the open loop and/or closed loop control electronics, an electronic output for a manipulating variable to pilot the electropneumatic converter is generated by the open loop and/or closed loop control electronics; and, in a predetermined operating condition of the field device, the manipulating variable is determined by a closed loop control algorithm based on the command variable and on another controlled variable different from an actual control member position measurement value.

Abstract: A holder for a magnet of a magnet sensitive regulating valve position detector of a regulating valve of a process plant. The detector can include a shaft turnably movable supported in a housing of the detector, the shaft defining a turning axis oriented parallel to a turning spring supporting itself at the housing, and having a lever arm being turnably fixed with the shaft, the lever arm being coupled to the regulating valve such that a regulating valve stroke movement by the lever arm is transferable into a shaft rotation movement. The holder includes a holding fixture to interlockingly hold the magnet, a fixing section connected to the holding fixture to fix the holder at the shaft turnably fixedly, and a support connected to the holding fixture and the fixing section to latchingly support the rotational spring to generate a rotational spring force on shaft rotation movement.