Abstract: A low-noise control valve in which a noise-dampening element (9) is arranged inside of the valve housing (1) in the passageway of the medium. A built-in element, in which lamellas touching one another are arranged over the entire cross section of passage parallel to each other and parallel to the direction of flow serves as noise-dampening element. These lamellas exhibit a linear corrugation, with the directions of the corrugations proceeding obliquely with respect to the direction of flow and the directions of the corrugations of two adjacent lamellas at a time intersecting each other. Favorable sound level reductions are achieved in small installation dimensions. In upper valves, the built-in element can be arranged at the valve cone. In rotary cone valves, it can be designed as a valve seat.

Abstract: A control organ for gaseous and liquid media. Inside of a housing, two shut-off elements are arranged in the passageway of the medium. These shut-off elements are designed as pipes (4, 5) arranged in a manner concentrical in each other and at the cylindrical surfaces in leading manner. In each case, one of the pipes (4) is fixedly connected to the housing, while the other pipe (5) is movable in the longitudinal direction. In specified zones of their cylindrical surfaces, the pipes (4, 5) are provided with passage slots (6, 7) which take a parallel course with respect to each other. The passage slots (6) of the pipe fixedly connected to the housing (1) are at an angle which differs from 0.degree. with respect to the passage slots of the immediately adjacent movable pipe (5). The arrangement of the slots (6, 7) in the spherical surfaces is such that in the closed position, the zones of the spherical surfaces of the two pipes (4, 5) provided with slots (6, 7) do not overlap at any place.