Electronic position transmission device adapted to transmit the position of stem of valves
AssigneeABB Kent-Taylor Limited
InventorsEugenio Volonterio, Riccardo Borelli
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Abstract
A device for measuring the displacement of stems of valves having a spindle coupled to a stem of a valve and provided with two inductive pickups; each inductive pickup is formed by a fixed part and a movable part constituting a variable inductor, which, following a displacement of the stem and a rotation of the spindle coupled thereto, generates an inductance variation of the electric circuit associated thereto; electronic excitation and detection means are adapted to convert the inductance variations into a pair of digital signals whose difference is indicative of the displacement of the stem.
Claims16
A device for measuring the displacement of stems of valves, comprising a spindle coupled to a stem of a valve and provided with two inductive pickups, each inductive pickup comprising a fixed part and a movable part constituting a variable inductor, which, following a displacement of said stem and a rotation of the spindle coupled thereto, generates an inductance variation of electric circuit associated thereto;
- and
- electronic excitation and detection means which convert said inductance variations into a pair of digital signals whose difference is indicative of the displacement of the stem.
A method for measuring the displacement of stems of valves, comprising the steps of:
- transforming the displacement of the stem into a rotation of a spindle coupled to said stem, said spindle being provided with two inductive pickups, each inductive pickup comprising a fixed part and a movable part constituting a variable inductor, which, following the displacement of said stem and a rotation of the spindle coupled thereto, generates an inductance variation of the electric circuit associated thereto;
- converting, by electronic excitation and detection means, said inductance variations into a pair of digital signals;
- carrying out the difference between said pair of digital signals, said difference being indicative of the displacement of the stem.
Dependencies are inferred from the claim text.