Valves and valve actuation – Valve head movably connected for accommodation to seat – With yieldable connection
Patent
1993-01-06
1994-04-19
Rivell, John
Valves and valve actuation
Valve head movably connected for accommodation to seat
With yieldable connection
251298, 251303, 251308, 454333, F16K 122
Patent
active
053038975
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to arrangements in damper valves, especially for ventilating plants, and has more particularly for its object a distinct supporting device for the valve damper.
Usually, such a valve damper is pivotally supported on a centrically placed damper shaft, so that the pivot axis of the damper extends diametrally with a circle disc-shaped damper. However, the circumferential shape of the damper which is adapted to the cross-sectional shape of the aperture in the channel in which it is to be arranged, may also be polygonal, possibly having rounded corners, but a circular circumferential shape is normally preferred.
Such valve dampers in ventilating plants have two active extreme positions, one open position wherein the plane of the damper blade extends in the longitudinal direction of the channel, as well as a nearly closed position wherein the plane of the damper blade extends approximately perpendicularly to the longitudinal direction of the channel. However, it has hitherto be found practically impossible to achieve 100% closure with dampers of this type; in the closed position a crescent-shaped open slot will develop, extending over the major part of the circumference of the damper.
In the normal use of such damper valves in ventilating plants, this does not represent a serious disadvantage, but the fire directions require that such ventilating channels should be capable of being closed smoke-tight in case of fire or at the initial stages of a fire. Therefore, the mounting of special so-called smoke-tight dampers is required; such smoke-tight dampers thus being mounted in addition to the ordinary damper serving to regulate the air flow within the channel.
It is the object of the invention to provide a supporting device for a valve damper of the present kind wherein the damper in addition to the open adjusting positions and the approximately closed position also may be brought to take a smoke-tight closed position, so that it also fulfills the function of said additional damper and, thus, makes the latter superfluous, while satisfying the fire directions on that point.
According to the invention, this object has been realized through designing the device in accordance with the features as defined in the following claims.
The damper and/or a seat formed within the channel in which the damper is mounted, will be provided with an annular seal, in order to establish a smoke-tight bearing of the damper against the seat in the smoke-tight closed position of the damper valve, wherein optimal sealing is obtained according to the invention.
The damper shaft may be eccentrically positioned in relation to the damper, and carriers connecting damper and shaft mutually, will be resilient laterally of the plane of the damper. Thus, when the damper has been brought into the approximately closed position wherein it forms an acute angle in relation to the plane of said seat, a continued rotation of the damper shaft will cause an expansion of the U-shaped carriers, which in combination with said eccentric positioning of the damper shaft give rise to a pressing force bringing the circumferential portion of the damper/seal not yet resting against the seat/seat seal, into sealingly bearing against the same, simultaneously as the circumferential portion of the damper/damper seal already resting against the seat, is kept in position. Thereby, 100% continuous sealing between the damper or its seal and the seal of the seat or the seat itself is obtained. A special design of the damper shaft contributes to favour this sealing effect.
An example of an embodiment of the invention is further explained in the following, reference being made to the drawings, wherein:
FIGS. 1 and 2 show the damper valve in elevational view in entirely open and partly closed position, respectively, the latter position corresponding to "normal" none-smoke-tight position;
FIG. 3 shows a cross-section through the channel wall along the line III--III in FIG. 2;
FIG. 4 shows a cross-sectional side view corresponding to FIG. 3, but showi
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Sirevag Tormod
Tengesdal Paul
Covent AS
Hochberg D. Peter
Jaffe Michael
Kusner Mark
Rivell John
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