초록 ▼

A rotary control valve includes a flow control element having a lower valve shaft rotatably received in a non-magnetic body portion. A magnet is coupled with a lower valve shaft and rotatable therewith to produce an external magnetic field that varies in accordance with the angular position of the f

A rotary control valve includes a flow control element having a lower valve shaft rotatably received in a non-magnetic body portion. A magnet is coupled with a lower valve shaft and rotatable therewith to produce an external magnetic field that varies in accordance with the angular position of the flow control element. A magnetic field detector, positioned in the external magnetic field, is operable to detect the external magnetic field and to produce position signals representative thereof, such being indicative of the angular position of the flow control element.

대표청구항 ▼

1. A valve comprising:a valve body having walls defining a flow path therethrough; a flow control element; mounting structure coupled with said flow control element and rotatably mounting said element in said flow path for rotation therein through a plurality of angular positions, said mounting stru

1. A valve comprising:a valve body having walls defining a flow path therethrough; a flow control element; mounting structure coupled with said flow control element and rotatably mounting said element in said flow path for rotation therein through a plurality of angular positions, said mounting structure including a first valve shaft extending through said body and an opposed, second valve shaft rotatably received in a body portion with said body and an angular position sensor including at least one magnet fixed relative to the flow control element, the magnet being rotatable with the flow control element and operable to present a magnetic field, a first sensor located so as to provide it with an angular orientation .phi.1 relative to a reference axis, and operable to detect the apparent strength of the magnetic field and to produce a signal V1 which is indicative thereof; a second sensor located so as to provide it with an angular orientation .phi.2 relative to the reference axis, and operable to detect the apparent strength of the magnetic field and to produce a signal V2 which is indicative thereof; an electric circuit operable to determine the angular position of the magnet and thereby the flow control element using the following formula, where the angular orientation of the rotatable element is .theta.v, [EQU2]