Patent ID: 8469341

Claim:
A desuperheating device for in-line operation in conjunction with superheated fluid piping upstream and downstream therefrom and of type comprising: an upper housing section and a lower housing section joined with a middle housing chamber of enlarged diameter relative to the upstream and downstream piping to form a mixing chamber of enlarged diameter relative to the upstream and downstream piping, wherein said joined housing sections being adapted for connection to said upstream and downstream piping; a desuperheater seat ring support fixed in said middle housing and supporting therewith an annular seat injection ring having a circumference with a slot and a annular seat injection ring being adapted for connection to a cooling fluid inlet piping to supply a cooling fluid to said annular seat injection ring, wherein said slot completely encircles and surrounds said circumference of said seat injection ring; and a valve plug slideably received in an axially disposed valve cage base structure to cooperate with said slot of said annular seat injection ring.