Fluid handling – Systems – Multi-way valve unit
Patent
1996-11-05
1998-11-10
Fox, John
Fluid handling
Systems
Multi-way valve unit
251 86, F16K 1144
Patent
active
058329579
DESCRIPTION:
BRIEF SUMMARY
This application is a national stage application, according to Chapter I of the Patent Cooperation Treaty.
Invention relates to a valve having at least one annular valve seat element according to the preamble of patent claim 1.
Such a valve is known, for example, from CH-A-536,957. The valve described has an annular valve seat, onto which a closing part can be brought to bear. The closing part is connected to a spindle which is mounted axially displacably. The sheet-like closing part is arched elastically and spherically in the closed position of the valve and rests with its edge region directly on the valve seat. The closing part consists of two disks which are clamped by means of a nut, with two washers interposed, on that end of the spindle which is the inner end in relation to the valve housing. In this design, said closing part behaves in the same way as a self-supporting diaphragm which is firmly clamped at its center and which, when supported only along its circumference on the valve seat, can arch elastically and spherically. In order to prevent the limit of elasticity of the two disks forming the closing part from being exceeded, a stop disk can additionally be arranged at a distance on the side of the disks which faces away from the spindle end.
In order to compensate errors of alignment between the spindle axis and the axis of the valve seat when the above valve is in the closed position, the spindle can, in its region adjacent to the closing part, be designed so as to be capable of bending elastically. In order to compensate slight manufacturing inaccuracies in the production of the individual elements of the valve, such as during the screwing-in of the valve seat ring, in the suspension of the movably displacable spindle, during the cutting of the internal thread into the partition between the two flow chambers in the valve housing and the like, the closing part has to be pressed onto the valve seat with a closing force additional to the sealing force, in order to overcome the inclination of the closing part. Furthermore, a generous overlap between the closing part and the annular valve seat is unavoidable, in order to prevent manufacturing inaccuracies in the overlap consequently leaky points in the closed position. So as to achieve a higher effective accuracy of the closed position, higher closing forces are therefore required, thus necessitating a larger dimensioning of the electromagnetic drive, and an exact dimensioning of the tolerances to preserve the overlap area is required.
The object on which the present invention is based is to improve a valve of the generic type, in such a way that a reduction in the closing forces at minimal additional outlay, using the conventional manufacturing technique, and a more accurate overlap of the closing part, without additional tolerances in respect of the valve seat, can be obtained.
This object is achieved, according to the invention, by means of a valve having the features of patent claim 1.
The great advantage of the invention is that, along with the usual quality requirements during production, higher accuracy of the closed position of a valve can be achieved and, nevertheless, there is no longer any need for further operating equipment. The closing forces required, which act on the closing part, are substantially lower, so that the valve can be operated by means of electromagnetic drives having smaller dimensions. The construction dimensions of the valve housing can also be adhered to without difficulty for the valve according to the invention, so that no changes in the existing assembly cycle have to be made and the practical use of a valve according to the invention is not influenced. Advantageously, the closing part is adjusted into the fitted closed position under the counterforce of a spring element necessary for the drive. This spring element makes nonpositive connection from the top side of the valve housing via the spindle to the closing part, so that inaccuracies of fit are compensated automatically by assembly.
Further particulars and
REFERENCES:
patent: 1525100 (1925-02-01), Lichtenberg
patent: 2812776 (1957-11-01), Lofftus
patent: 3185172 (1965-05-01), Hajek
patent: 4114850 (1978-09-01), Alamprese
patent: 5246205 (1993-09-01), Gillingham et al.
Bruhlmann Manuel
Bucher Hans
Zumbuhl Max
Fox John
Staefa Control System SCS AG
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