Flow-control valve with valve member position sensor

Details Flow-control valve with valve member position sensor Flow-control valve with valve member position sensor

1998-07-14

2000-02-08

Coe, Philip R.

Textiles: fluid treating apparatus

Machines

Liquid supply or vapor supply to liquid

137554, D06F 4300, F17D 300

Patent

active

060216522

ABSTRACT:
A valve member position sensor for continuously monitoring the position of the valve member of a flow-control valve in a dry-cleaning apparatus using CO.sub.2 as the cleaning fluid. The valve member position sensor includes a potentiometer with its shaft connected to the drive shaft of the valve such the resistance of the potentiometer changes with the valve member position. The resistance value of the potentiometer is detected by passing a constant current through the potentiometer to produce a voltage drop across the potentiometer. The voltage drop is measured by a controller to determine the valve position.

REFERENCES:
patent: 4926903 (1990-05-01), Kawai
patent: 5027853 (1991-07-01), Walko et al.
patent: 5098063 (1992-03-01), Ronzon
patent: 5099867 (1992-03-01), Emery
patent: 5159949 (1992-11-01), Prescott et al.
patent: 5564470 (1996-10-01), Denmark et al.
patent: 5822818 (1998-10-01), Chao et al.

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