A valve assembly (200;300;400) for an active clearance control system in a gas turbine engine, comprising: a housing (202;302;402) defining an annular inlet duct (204;304;404) having a central inlet axis, a first annular outlet duct (206;306;406) having a first central outlet axis, and a second annular outlet duct (208;308;408) having a second central outlet axis; wherein the inlet duct (204;304;404) is configured to direct a flow of fluid to the first outlet duct (206;306;406) and the second outlet duct (208;308;408); a first valve disc (216;316;416) positioned within the first outlet duct (206;306;406); a second valve disc (218;318;418) positioned within the second outlet duct (208;308;408); a shaft (224;324;424) coupled to the first and second valve discs (216,218;316,318;416,418) such that rotation of the shaft (224;324;424) rotates both the first and second valve discs (216,218;316,318;416,418) within the first and second outlet ducts (206,208;306,308;406,408), respectively, wherein the first and second valve discs (216,218;316,318;416,418) are configured to rotate between a first closed position and a second fully-open position to vary the amount of fluid flow permitted through the first and second outlet ducts (206,208;306,308;406,408); and a flow control member (226;326;426) in the second outlet duct (208;308;408) surrounding the second valve disc (218;318;418), wherein the flow control member (226;326;426) is configured to restrict fluid flow passing through the second outlet duct (208;308;408) to a greater extent than the fluid flow passing through the first outlet duct (206;306;406) for a given degree of rotation of the first and second valve discs (216,218;316,318;416,418) from the first position. a housing (202;302;402) defining an annular inlet duct (204;304;404) having a central inlet axis, a first annular outlet duct (206;306;406) having a first central outlet axis, and a second annular outlet duct (208;308;408) having a second central outlet axis; wherein the inlet duct (204;304;404) is configured to direct a flow of fluid to the first outlet duct (206;306;406) and the second outlet duct (208;308;408); a first valve disc (216;316;416) positioned within the first outlet duct (206;306;406); a second valve disc (218;318;418) positioned within the second outlet duct (208;308;408); a shaft (224;324;424) coupled to the first and second valve discs (216,218;316,318;416,418) such that rotation of the shaft (224;324;424) rotates both the first and second valve discs (216,218;316,318;416,418) within the first and second outlet ducts (206,208;306,308;406,408), respectively, wherein the first and second valve discs (216,218;316,318;416,418) are configured to rotate between a first closed position and a second fully-open position to vary the amount of fluid flow permitted through the first and second outlet ducts (206,208;306,308;406,408); and a flow control member (226;326;426) in the second outlet duct (208;308;408) surrounding the second valve disc (218;318;418), wherein the flow control member (226;326;426) is configured to restrict fluid flow passing through the second outlet duct (208;308;408) to a greater extent than the fluid flow passing through the first outlet duct (206;306;406) for a given degree of rotation of the first and second valve discs (216,218;316,318;416,418) from the first position.