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: The invention relates to a control valve for adjusting a process fluid flow of a process plant, comprising a valve housing with a valve seat and a valve member connected to a valve rod, which cooperates with the valve seat for opening and closing the control valve, wherein the valve rod is electrically connected to the valve housing through a contact device. The invention is characterized in that a measuring device for the ohmic transition resistance measurement of the contact device is provided, and that the measuring device is arranged in a measuring line that connects the valve housing to the valve rod.

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: The invention relates to a control valve for adjusting a process fluid flow of a process plant, comprising a valve housing (4) with a valve seat (10) and a valve piston (12) connected to a valve rod (14), which valve piston (12) interacts with the valve seat (10) for opening and closing the control valve (2). The invention is characterized in that, for connecting the valve rod (14) to the valve piston (12), a flange (22) is mounted on the valve rod (14), which flange (22) is screwed to the valve piston (12) via plural threaded connecting elements (34; 48).

Abstract: The invention relates to a valve (10, 50, 52) for operating a pressurizing medium driven actuator of a process control valve for technical process equipment, comprising a valve seat (14) in a basic valve body (48), a closing body (12) and an electromagnetic drive (18, 30), which closing body (12) is ball -shaped and cooperates with a valve seat (14) so as to block the flow from an inlet side to an outlet side, said closing body (12) cooperating with a piston surface (20) which can be moved within a piston chamber (25) connected to the inlet side, characterized in that a connecting element (17) is provided between the closing body (12) and the piston surface (20) which is actively connected to an armature (18) of an electromagnetic linear direct drive, with a coil assembly (30) being embedded in the basic valve body (28) and a magnetic field with alternating polarity in the axial direction being present at the armature (18).

Abstract: Actuating device for process valves (2) comprising a housing (22), comprising two housing parts (24, 26) and an actuating membrane member (20) sealingly mounted between housing parts (24, 26) and moveable in strokes which, on the one hand, forms together with the housing a pressurizeable working chamber (28) and, on the other hand, is loaded by at least one return spring (32) such that, in the unpressurized state, the actuating membrane member (20) is brought into a predefined position by means of the pre-tension of the return spring (32), wherein the actuating membrane member (20) is adapted to be connected to a valve shaft (18) connected to the valve body (16) of the process valve (2).

Abstract: Sealing arrangement of a fluid system for use with cryogenic media, said arrangement comprising a sealing ring in which a first system component is connected to a second system component by means of the sealing ring which sealing ring further has a first sealing surface which sealingly engages the first system component and the sealing ring has a second sealing surface which sealingly engages the second system component which first sealing surface and second sealing surface of the sealing ring are designed such that the first and second system components in the area of the sealing surfaces extend radially within the sealing ring in a section plane which extends parallel to the direction of contraction, and the sealing ring when exposed to cold, contracts thermally to a greater extent than the first system component and the second system component.

Abstract: The invention relates to a process for a control valve having a valve seat and a throttle element, which throttle element has a sealing edge for sealing the valve seat, and furthermore a first opening area and a second opening area, which throttle element can furthermore be positioned relative to the valve seat by a positioning motion such that the first opening area will be effective in a first opening position thereof and/or the second opening area will be effective in a second opening position thereof, characterized in that a sealing element is arranged on the throttle element and/or the valve seat such that the throttle element will pass over a sealing position as it transitions from the first opening position to the second opening position, in which sealing position the first opening area will be effective and the second opening range will not be effective.

Abstract: The invention refers to a cage valve comprising a valve cover (20, 42, 62) and a valve cage, which latter comprises a retaining element (28, 54, 72) and a plurality of throttle elements (30) which are designed in the form of a hollow section. The invention is characterized in that the valve cage is connected to the valve cover (20, 42, 62).

Abstract: The invention relates to a control valve for adjusting a process fluid flow of a process plant, comprising a valve housing (4) with a valve seat (10) and a valve piston (12) connected to a valve rod (14), which valve piston (12) interacts with the valve seat (10) for opening and closing the control valve (2). The invention is characterized in that, for connecting the valve rod (14) to the valve piston (12), a flange (22) is mounted on the valve rod (14), which flange (22) is screwed to the valve piston (12) via plural threaded connecting elements (34; 48).

Abstract: The invention relates to a pressure indicating device for indicating a pressure in a first fluid system, said pressure indicating device including a first port via which it is fluidically connected to the first system, which pressure indicating device furthermore comprises a cylinder with a preloaded piston that can be displaced therein in an axial direction, during which movement fluid contained in the first system can act on the piston surface. The invention is characterized in that said piston has an opening in its piston surface, which opening can be made to communicate with a second system via a second port, said piston comprising a diaphragm which is impermeable to a first fluid but permeable to a second fluid, said diaphragm separating the first port from the second port.

Abstract: Actuating device for process valves (2) comprising a housing (22), comprising two housing parts (24, 26) and an actuating membrane member (20) sealingly mounted between housing parts (24, 26) and moveable in strokes which, on the one hand, forms together with the housing a pressurizeable working chamber (28) and, on the other hand, is loaded by at least one return spring (32) such that, in the unpressurized state, the actuating membrane member (20) is brought into a predefined position by means of the pre-tension of the return spring (32), wherein the actuating membrane member (20) is adapted to be connected to a valve shaft (18) connected to the valve body (16) of the process valve (2).

Abstract: A diaphragm actuator (10, 40) for a control valve is shown including an actuator housing (12, 42), in which a diaphragm (14, 44) including a diaphragm disk (16, 46) is sealingly fitted thus forming a pressure chamber (20, 50), and furthermore at least one spring (24, 54) is provided which rests against the diaphragm disk (16, 46) and the actuator housing (12, 42), with the diaphragm disk (16, 46) being connected to a valve stem (22, 52) for actuating a valve body. At least two springs (26, 56) are provided and are disposed one after another in an axial direction between the actuator housing (12, 42) and the diaphragm disk (16, 46), with a spring seat element (28, 58) linearly guided by at least one linear guiding element (30, 60) being provided between the at least two springs (26, 56).

Abstract: The invention relates to a coupling (10) which comprises a first component (12) and a second component (14) as well as a spring-loaded entrainer (16) which is spring-loaded and mounted on said first component (12), which second component (14) is furthermore rotatably mounted relative to said first component (12) and can be made to rotate in a first direction of rotation—the freewheeling direction (F)—and in a second direction of rotation—the blocking direction (S)—opposite to said first direction of rotation, which second component (12) furthermore comprises a guide means (18) which is designed so as to prevent a spring-loaded entrainer (16) from engaging said guide means (18) during rotation of said second component (14) in the freewheeling direction (F).

Abstract: Sealing arrangement of a fluid system for use with cryogenic media, said arrangement comprising a sealing ring in which a first system component is connected to a second system component by means of the sealing ring which sealing ring further has a first sealing surface which sealingly engages the first system component and the sealing ring has a second sealing surface which sealingly engages the second system component which first sealing surface and second sealing surface of the sealing ring are designed such that the first and second system components in the area of the sealing surfaces extend radially within the sealing ring in a section plane which extends parallel to the direction of contraction, and the sealing ring when exposed to cold, contracts thermally to a greater extent than the first system component and the second system component.

Abstract: The invention refers to a cage valve comprising a valve cover (20, 42, 62) and a valve cage, which latter comprises a retaining element (28, 54, 72) and a plurality of throttle elements (30) which are designed in the form of a hollow section. The invention is characterized in that the valve cage is connected to the valve cover (20, 42, 62).

Abstract: A differential pressure measuring device (10, 50) comprising a housing (18) having two pressure areas (20, 22) which are sealed relative to each other and are separated from each other by a membrane (12, 54). The membrane (12, 54) comprises a pressure plate (14) surrounded by an elastic circumferential area (16) allowing axial movement of the pressure plate (14). An indicator element (24, 56) is permanently connected to the pressure plate (14) and whose position can be evaluated in a non-contact manner by a sensor (34, 58). At least one pair of springs (28, 52) is provided, with one spring (30, 32) each of said pair of springs being located in an allocated pressure area (20, 22). Each spring (30, 32) of said pair of springs (28, 52) exerts an opposing spring force on the pressure plate (14).

Abstract: The invention relates to a process for a control valve having a valve seat and a throttle element, which throttle element has a sealing edge for sealing the valve seat, and furthermore a first opening area and a second opening area, which throttle element can furthermore be positioned relative to the valve seat by a positioning motion such that the first opening area will be effective in a first opening position thereof and/or the second opening area will be effective in a second opening position thereof, characterized in that a sealing element is arranged on the throttle element and/or the valve seat such that the throttle element will pass over a sealing position as it transitions from the first opening position to the second opening position, in which sealing position the first opening area will be effective and the second opening range will not be effective.

Abstract: The invention relates to a positioner (10) for an actuator (12) comprising a processing unit (22) and an output unit (20) which can be connected to an actuating drive (15) of an actuator (12), as well as a measurement unit (24). The invention is characterized in that said positioner (10) comprises a current source (26) which can be connected to a voltage source (30) of a control system (14) via a single two-wire current loop (28). The invention furthermore relates to a method for operating a positioner (10) including the transmission of measuring values recorded in the positioner (10) to a higher-level controller (14). The method is characterized in that the actuating signals are transmitted in a digital form whereas the measuring data is transmitted to a higher-level controller in an analog form, with both digital and analog signals being transmitted on the same two-wire line.

Abstract: The invention relates to a control valve (10) for controlling a fluid flow, comprising a valve housing (22) and a positioning element (12) which can be translationally moved and which includes a shut-off portion (14, 70) and a throttle portion (16), with a valve seat being furthermore provided which includes a sealing portion (18, 44) and a throttle opening portion (28, 46), with the shut-off portion (14, 70) of said positioning element (12) being adapted to cooperate with the sealing portion (18, 44) of the valve seat (20, 40) so as to enable shut-off of the fluid flow, and with the throttle portion (16) of the positioning element (12, 54) being adapted to cooperate with the throttle opening portion (28, 46) of the valve seat (20, 40, 60) so as to enable the setting of a defined fluid flow, with at least the surfaces of the throttle opening (28) and the sealing portion (18, 44) being furthermore made of the same hard material.