Butterfly valve with sensing coil

Details Butterfly valve with sensing coil Butterfly valve with sensing coil

1995-02-16

1997-03-11

Look, Edward K.

Fluid handling

With indicator, register, recorder, alarm or inspection means

Position or extent of motion indicator

F16K 3700, F16K 122

Patent

active

056091834

ABSTRACT:
This invention relates to a butterfly valve incorporating means for accurately sensing the position of the valve disc within the valve body. One or two coils are embedded within the valve seal. A current is generated within one of the coils and a sensor connected either to the same coil or the other coil measures the change in induction characteristics of the coil as the disc is moved. The signal sensed by the sensor is indicative of the disc position.

REFERENCES:
patent: Re33649 (1991-07-01), Kawai
patent: 3602254 (1971-08-01), Fawkes
patent: 4468559 (1984-08-01), Hurst et al.
patent: 5193568 (1993-03-01), Eissenberg et al.
patent: 5471138 (1995-11-01), Glass, III et al.

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