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A steam desuperheater comprising a liquid spray tube assembly positioned in a steam line and including a plurality of liquid outlet openings supplying liquid to plural spray nozzles, and a hollow piston plug axially movable therein upwardly from a lower valve seat to progressively open said outlet o

A steam desuperheater comprising a liquid spray tube assembly positioned in a steam line and including a plurality of liquid outlet openings supplying liquid to plural spray nozzles, and a hollow piston plug axially movable therein upwardly from a lower valve seat to progressively open said outlet openings.

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A desuperheater, which comprises (a) a cage structure including an internal flow path, (b) a generally flat, rectangular nozzle surface formed on said cage structure, (c) a plurality of slot-like openings formed through said cage structure and arranged in a predetermined pattern across the rectangul

A desuperheater, which comprises (a) a cage structure including an internal flow path, (b) a generally flat, rectangular nozzle surface formed on said cage structure, (c) a plurality of slot-like openings formed through said cage structure and arranged in a predetermined pattern across the rectangular nozzle surface, (d) each of said slot-like openings providing flow communication between the internal flow path and the rectangular nozzle surface, (e) a plurality of nozzle means, (f) each of said nozzle means including a swirl inducing structure and a fluid discharge opening, (g) said nozzle means being arranged across and supported against said flat rectangular nozzle surface whereby each of said nozzle means is in flow communication with one of said slot-like openings, (h) a valve seat formed at the lowermost end of said internal flow path, and (i) a hollow piston plug received in a leak-tight relation within said internal flow path and arranged for selective, controlled axial displacement within said internal flow path through a predetermined work stroke, (j) said plug being matable with said valve seat when said plug is at the lowermost end of its work stroke, (k) said slot-like openings and said plug being arranged and configured whereby said plug physically covers and isolates all of said slot-like openings from flow communication with said internal flow path when said plug is seated against said valve seat, (l) said plug including at least one flow port formed at a topmost portion of the plug whereby fluid flow in said internal flow path will flow through said port into the interior of the hollow plug and toward said valve seat, (m) said plug including an opening formed at its lowermost end, (n) said slot-like openings and said plug being arranged and configured with respect to one another whereby said slot-like openings are progressively and sequentially exposed to flow communication with said internal flow path as said plug is axially displaced within said internal flow path toward the upper end of its work stroke.