Fluid handling – With cleaner – lubrication added to fluid or liquid sealing... – Cleaning or steam sterilizing
Reexamination Certificate
2000-01-19
2001-08-14
Lee, Kevin (Department: 3753)
Fluid handling
With cleaner, lubrication added to fluid or liquid sealing...
Cleaning or steam sterilizing
C137S331000
Reexamination Certificate
active
06273121
ABSTRACT:
OBJECT OF THE INVENTION
The present invention relates to a device applicable to valves in alumina obtaining installations with the object of providing self-cleaning of bauxite depositions inside the valve body, by rotation and scraping of seats inside the valve body.
BACKGROUND OF THE INVENTION
As is known, aluminum is obtained by electrolysis from bauxite, with the bauxite passing through several phases or process stages before alumina, and afterwards aluminum may be obtained.
At installations where this type of process is carried out, over time bauxite adheres to valve seats, and although occasionally this problem may result in the bauxite acting as a sealant between the valve disc or ring and the seat, the general results in that the disc cannot rest properly on the valve seat.
These depositions inside the valve must be removed manually.
This type of valves comprises a rod or shaft with a disc or seal solidly joined to it which is housed inside the valve body, so that these elements make up the valve itself.
The valve is driven by means of an input shaft which, through a bevel gear, drives a crown provided with recesses in which fit battlement-shaped projections provided in the spindle nut, so that the rotation of the crown is transmitted to the spindle nut, which in turn causes the valve shaft to ascend or descend, and therefore causes the coupling or decoupling of the valve disc or ring on the valve body seats.
SUMMARY OF THE INVENTION
The valve for alumina obtaining installations disclosed has been conceived to solve the above described problem, by incorporating a device which allows internal self-cleaning of the same, and more specifically elimination of bauxite depositions on the seats, in order to ensure a perfect contact between the disc and packing rings of the valve body.
To this end, a device is provided which causes rotation of the ring or disc about its shaft, so that said rotation causes scraping of the ring on the seats inside the valve body. The friction from the scraping removes the adhered depositions.
The device consists of a locking cap which is coupled to the top end of the valve shaft by means of an inner toothing, and is additionally inserted by means of flaps in recesses of the crown which drives the spindle nut, thus relating the valve shaft to the crown so that they will both move simultaneously.
Thus, rotation of the input shaft will cause, through the bevel gear, a rotation of the crown, and in turn the latter will carry in its motion the spindle nut and the locking cap. The locking cap will carry the valve shaft in its motion, causing a rotation of the valve disc or ring inside the valve body, and with it scraping of the seats.
In order to resume normal operation of the alumina valve, the locking cap is withdrawn, decoupling motion of the crown and the shaft so that rotation of the input or driving shaft in either direction causes rotation of the crown and therefore the spindle nut, and the rising or lowering of the valve shaft.
REFERENCES:
patent: 1228582 (1917-06-01), Mowry
patent: 2984127 (1961-05-01), Schwenk
patent: 3995966 (1976-12-01), Blancha
patent: 4346728 (1982-08-01), Sulzer
patent: 4460009 (1984-07-01), Nanci et al.
patent: 4465091 (1984-08-01), Keller
patent: 6119716 (2000-09-01), Wright
patent: 6193762 (1994-07-01), None
English Abstract of JP-06193762 A.
Ampo, S. Coop.
Ladas & Parry
Lee Kevin
LandOfFree
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