A B767-300'S RIGHT ENGINE BLEED VALVE TRIPPED AND WOULD NOT RESET. BECAUSE ENROUTE REQUIREMENTS MANDATED DUAL BLEEDS; THE FLIGHT RETURNED TO LAND FOR MAINTENANCE.

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THE FLT WAS DISPATCHED NORMALLY; WITH 1 AUTO FUNCTION OF THE PRESSURIZATION CTLR DEFERRED INOP. ENG START; TAXI; AND TKOF WERE NORMAL; BUT AT APPROX 800 FT AGL; I NOTICED AN EICAS R PACK OFF MESSAGE. I LOOKED UP AT THE OVERHEAD PANEL; AND SAW THAT THE R BLEED OFF LIGHT WAS ILLUMINATED; AS WELL AS THE R PACK OFF. I DIRECTED THE COPLTS TO WAIT UNTIL WE REACHED A SAFE ALT BEFORE COMMENCING CHKLISTS; SO WE CONTINUED A NORMAL CLBOUT. DURING THE CLB; IT WAS NECESSARY TO USE ENG ANTI-ICE; AND WE FOUND THAT THE R PACK OFF LIGHT WAS EXTINGUISHED WHEN WE USED THE ENG ANTI-ICE. CLBING THROUGH FL180; WE BEGAN TO RUN THE BLEED OFF IRREGULAR CHKLIST. THE CHKLIST WAS ACCOMPLISHED; AND THE RESULT WAS THE SAME; THE BLEED OFF LIGHT ILLUMINATED. CONTACTED DISPATCH; AND PHONE-PATCHED TO MAINT. UNDER THE DIRECTION OF MAINT WE TRIED A BIT OF TROUBLESHOOTING (CIRCUIT BREAKERS; OPENING ENG ANTI-ICE VALVES); BUT WE WERE UNABLE TO RESOLVE THE PROB. FURTHER; THE R PACK OFF LIGHT REMAINED ILLUMINATED WHETHER WE USED ENG ANTI-ICE OR NOT. THE RTE TO ZZZ1 INCLUDES VERY HIGH TERRAIN; AND SOME COMPLEX DEPRESSURIZATION PROCS. THE DISPATCHER AND I WERE IN AGREEMENT THAT THE SAFEST COURSE OF ACTION WAS TO RETURN TO ZZZ. WE DUMPED APPROX 44000 LBS OF FUEL FROM THE CTR TANK; I SPOKE WITH THE PURSER OF THE SIT; AND ISSUED A CABIN ADVISORY. I MADE AN ANNOUNCEMENT TO THE PAX; AND WE RETURNED TO ZZZ. LNDG AND ROLLOUT WERE NORMAL; ALTHOUGH WE WERE OVERWT; AT APPROX 345000 LBS. AFTER PARKING; I DIRECTED THE RELIEF PLT TO ENTER THE MALFUNCTIONS AND OVERWT LNDG INTO ACARS; AND WENT TO OPS TO CALL THE CREW DESK.