B777-200
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe
Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport; General Declared Emergency
Aircraft
Shortly after takeoff PACK R EICAS message appeared on upper screen. Pack R procedure accomplished with no reinstatement of right pack. review of Air synoptic page showed right engine bleed valve; pack valve; and right isolation valve all closed. ENG BLD LOSS R EICAS message also noted at this time.  Established communication with Dispatch and Maintenance. Because of loss of wing anit-ice as a result of the above proceedure the decision to return was concurred with by all parties.  Emeregency was declared with ATC on hand off. Coordinated with ATC for fuel jettison. 43;000 lbs of fuel was jettisoned at FL300; for approximately 14 mins.  Recovered with uneventful landing below max landing weight.
B777 Captain reports loss of the right pack shortly after takeoff. Pack reinstatement is attempted before noting that the right engine bleed valve and right isolation valve are also closed. Fuel is dumped and the flight returns to the departure airport.