Control valve
AssigneeSamsoon AG
InventorsChristian Mellinger, Harald Kah
Life of this patent
Estimating the term…
Abstract
The invention relates to a control valve for adjusting a process fluid flow of a process plant, comprising a valve housing (8) with a valve seat (14) and a valve member (16) connected to a valve rod (18), which cooperates with the valve seat (14) for opening and closing the control valve (2), wherein the valve rod (18) is electrically connected to the valve housing (8) through a contact device (42, 43, 45). The invention is characterized in that a measuring device (26) for the ohmic transition resistance measurement of the contact device (42, 43, 45) is provided, and that the measuring device (26) is arranged in a measuring line (24) that connects the valve housing (8) to the valve rod (18).
Claims14
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, a positioner connected to the valve rod, a stroke pickup member connected to the positioner a measuring device between a rotary lever and the valve housing and the valve housing are continuously electrically connected to each other,
- wherein the measuring device is configured to continuously measure an ohmic resistance of the continuous electrical connection therebetween, and the measuring device is arranged in a measuring line that connects the valve housing to the valve rod, and
- wherein the valve rod is continuously electrically connected to the valve housing via the stroke pick-up member of the positioner on the valve rod, the rotary lever of the positioner which is continuously electrically connected to the stroke pick-up member on the valve rod via an elevating roller, a shaft of the stroke pick-up member guided by the positioner, a sliding contact engaging the shaft, the measuring device and the positioner permanently connected to the actuating drive.
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, a positioner connected to the valve rod, a stroke pickup member connected to the positioner, a measuring device between a rotary lever and the valve housing and the valve housing are continuously electrically connected to each other,
- wherein the measuring device is configured to continuously measure an ohmic resistance of the continuous electrical connection therebetween, and the measuring device is arranged in a measuring line that connects the valve housing to the valve rod, and
- wherein the valve rod is continuously electrically connected to the valve housing via the stroke pick-up member of the positioner on the valve rod, the rotary lever of the positioner which is continuously electrically connected to the stroke pick-up member on the positioner via an elevating roller, a shaft of the stroke pick-up member guided by the positioner, an electrically conducting torsional spring which extends around an electrically conducting shaft of the stroke pick-up member guided by the positioner, the measuring device and the positioner permanently connected to the actuating drive.
Dependencies are inferred from the claim text.