| 摘要 |
a throttle valve comprises a piston element (2) and a sleeve (3), which encloses and can be turned around the piston element (2). Each element (2, 3) is provided with a number n of holes and is adapted to be turned individually to create the restriction area (14, 15), the number n of holes (14) in one element (2) being equal to the number of covering areas (15) in the second element (3). The valve can be used for automatic regulation of a central heating or air-conditioning system so that the flow is limited to a predetermined amount in the entire system, in one part hereof or in several parts hereof being divided into zones, when both elements (2, 3) are divided in equally large segments, when there is a maximum of one hole in each segment, when the area of the holes in one element (2) is larger than the area (An) of the largest hole in the second element, and when the equidistant division is determined by the number n of holes according to the formula 2<n> = Dx2, where D is the number of equally large segments along the circumference and where there are two turning positions for each segment D. |
