Abstract: A valve housing in the form of a straight- or bent-passage valve accepts in the the valve seat between its steam intake and steam outlet a choking device in the form of a perforated bushing into which a cold-water pipe with jacket-side cold-water exits projects coaxially. A control piston is mounted in such a way that it can move inside the perforated bushing and around the cold-water pipe. The control surface of the piston simultaneously releases the cold-water exits in the cold-water pipe and the reduction bores in the perforated bushing, resulting in cooling of the steam and reduction of its pressure in the high steam-pressure range in accordance with load. The cold water is accordingly injected into the hot steam as it flows in and only then does the steam, enriched with cold water, pass through the reduction bores.