Providing an indication of the position of a valve member

Details Providing an indication of the position of a valve member Providing an indication of the position of a valve member

2006-04-11

2006-04-11

Krishnamurthy, Ramesh (Department: 3753)

Fluid handling

With indicator, register, recorder, alarm or inspection means

Plural

C137S488000, C137S553000, C137S557000, C244S118500, C244S13400A, C340S611000

Reexamination Certificate

active

07025088

ABSTRACT:
A method of providing an indication of the position of a valve member of a valve in a fluid path where the valve member is moveable between a fully open position in which a maximum flow of fluid past the valve member is permitted and a closed position in which fluid flow past the valve member is at least substantially prevented, the method including sensing the fluid pressure in the fluid path upstream of the valve member to provide a first signal to a controller, sensing fluid pressure in the fluid path downstream of the valve member to provide a second signal to the controller, and sensing fluid flow downstream of the valve member to provide a third signal to the controller, the controller comparing the first and second signals and applying the third signal, and depending on the comparison of the first and second signals and the third signal, the controller signalling an alerting device which indicates whether the valve member is in at least one of an open and closed position.

REFERENCES:
patent: 2773251 (1956-12-01), Snyder
patent: 3393699 (1968-07-01), Feldman
patent: 3682196 (1972-08-01), Kosui et al.
patent: 3909152 (1975-09-01), Rannenberg
patent: 4188624 (1980-02-01), Hochsprung et al.
patent: 4428194 (1984-01-01), Stokes et al.
patent: 6308723 (2001-10-01), Louis et al.
patent: 6446657 (2002-09-01), Dziorny et al.
patent: 6557400 (2003-05-01), Xiong et al.
patent: 6631716 (2003-10-01), Robinson et al.

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