| 主权项 |
1. A control valve assembly, comprising:
a valve housing; a valve member having a valve body rotatably contained in the housing and a valve stem connected to the valve body, the valve member rotationally moveable about an axis of rotation relative to the valve housing between a plurality of rotary positions of the valve member; an off-axis valve-position monitoring and control system coupled to the valve member and configured to precisely determine valve conditions related to rotary positions of the valve member, the valve-position monitoring and control system comprising:
a transducer array assembly having a plurality of spaced apart transducers in an arcuate arrangement disposed about the axis of rotation and spaced apart from the valve member, the transducers being in a fixed, non-moveable position relative to the valve housing;a magnetic-field source fixed to the valve member and rotatable with the valve member as a unit, the magnetic-field source includes at least one magnetic member adjacent to the array assembly and out of physical engagement with the transducers, the magnetic member being moveable along an arcuate path substantially parallel to the arcuate arrangement of the transducers as the valve member rotates through the plurality of rotary positions, wherein the magnetic-field source provides magnetic flux detectable by at least a plurality of the transducers to precisely determine at least one of the rotational positions of the magnetic-field source, the rotational position of the valve member, and a rate of flow through the control valve assembly,wherein the magnetic-field source includes Ferrous-based U-shaped member with a first magnet on a first leg and a second magnet on a second leg and aligned with the first magnet with at least a portion of the transducer array assembly positioned between the first and second magnetics. |
