AIRFLOW REGULATING VALVE

Abstract: An airflow regulating valve in a tube through which an airflow passes. The valve includes first and second hollow, cone-shaped bodies (1, 2) of which the first body is inserted into the second body. The mantle surfaces of both bodies have openings (1a-1d, 2a-2d) and at least one of the bodies is turnable relative to the second body in order to alter the size of the openings and thereby the size of the airflow through the valve.

Description: IR FLOW REGULATING VALVE D E S C R I P T I O N Technical Field The present invention relates to an airflow regulating valve as described in the introduction of claim 1. Prior Art In regulating and adjusting the airflow in ventilating systems, valves are used which consist in principle of one or more valve blades fitted in a ventilating duct the valve blades being fixed to a rotat- ing axis adjustable from outside the ventilating duct. It is difficult to regulate the airflow volume with these valves. Also other types of valves, for example so called baffle type valves, are known. A common feature of the known types of airflow regulating valves is that in some situations a minor adjusting movement can increase or reduce the airflow to a considerable degree, and it is therefore difficult to get a stable and accurate regulation. The known valves also cause high levels of noise. Description of the Invention The object of the present invention is to eliminate the disadvantages of the above-mentioned known airflow regulating valves and to provide a valve which can be adjusted with high accuracy, causes only low levels of noise, is easily manufactured and installed, and can be adapted to the desired airflow characteristics, by simple design modifications (especially as regards location, size, shape and number of slits). Description of Figures Figure 1 is an end view of the device according to the invention, and Figure 2 is a section plan view, taken along the line 11—11 of Figure 1. Preferred Embodiment Two hollow, cone-shaped bodies 1 and 2 are combined in a tube 3 through which an airflow is led in either direction. The bodies 1 and 2 are identical, as shown in Figure 2, and each has openings in the mantle surface, in the form of four slits 1a-1d and 2a-2d, respectively, which are evenly distributed around the body. The position, shape number and size of the slits 1a-1d and 2a-2d can be changed in accordance with the airflow and regulation characteris ics desired. The cone openings of the bodies 1 and 2 have cylindrical casings 4 and 5 respectively of which the innermost 4 has a slightly smaller diameter than the outer 5 and is connected to a control lever 6 protruding through openings (not shown) in the outer casing 5 and the tube 3. The casing 5 is airtightly joined to the tube 3. Alternatively, the inner casing 4 can be joined to the tube 3 and the outer casing 5 can be turnable by using a lever similar to the control lever 6, or else both casings 4 and 5 can be fitted with control levers so that both bodies 1 and 2 can be turned relative to each other. While only one embodiment is shown in the draw- ing and described above, it is to be understood that the invention is not limited to this embodiment but only by what is stated in the claims.

Claims: CLAIMS 1. An airflow regulating valve in a tube, through which an airflow passes, characterized in that the valve includes first and second, hollow, cone-shaped bodies (1, 2) of which the first body is inserted into the second body, and that the mantle surfaces of both the bodies have openings (1a-1d, 2a-2d) and at least one of the bodies is turnable relative to the other body in order to alter the size of the openings and thereby the size of the airflow through the regulating valve. 2. A device according to claim 1, characterized in that the openings (1a-1d, 2a-2d) are provided as slits. 3. A device according to claim 1 or 2, characterized in that a plurality of openings (1a-1d, 2a-2d) are distributed around the mantle surface of each body (1 , 2) 4. A device according to any of the above claims, characterized in that both of the bodies (1 , 2) are identical with regard to the number of openings (1a-1d, 2a-2d) and/or with regard to cone-shape.

Inventors: JOHANSSON FOLKE, JOHANSSON, FOLKE
Applicants: JOHANSSON FOLKE, JOHANSSON, FOLKE
Application year: 1990
Main classification: F16K3
IPC codes: F16K3, F24F13