B727-200 ENG FLAMEOUT DURING CLB DUE TO THE FUEL VALVE BEING IN THE CLOSED POS. IN ADDITION; THE OIL PRESSURE FILTER BYPASS LIGHT CAME ON AND THE #2 ELECTRICAL BUS OPENED IN THE UNDER-EXCITATION FAULT POS; BOTH NORMAL OCCURRENCES DURING SHUT DOWN.

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ACFT B727-200 CLBING PAST FL220. FO WAS FLYING. #3 ENG FLAMED OUT. ALL OTHER ENG INDICATIONS WERE NORMAL. I; AS SO; SWITCHED ESSENTIAL PWR TO #1 ENG AND WORKED WITH CAPT ON THE ENG FAILURE CHKLIST. WHEN WE CAME TO THE CHKLIST ITEM 'FUEL SHUTOFF VALVE-CLOSED;' I DISCOVERED THE FUEL SHUTOFF VALVE ALREADY IN THE 'CLOSED' POS. THIS OF COURSE WAS CERTAINLY THE CAUSE OF THE ENG SHUTDOWN. I IMMEDIATELY RPTED TO THE CAPT THAT THE FUEL SHUTOFF VALVE WAS ALREADY CLOSED. ONLY I COULD HAVE ACCIDENTALLY CLOSED THE FUEL SHUTOFF VALVE AND I DO NOT KNOW HOW I COULD HAVE DONE THIS WITHOUT KNOWING IT. WHEN THE ENG SHUT DOWN; I WAS AS SURPRISED AS ANYONE AND DID NOT EVEN CONSIDER THE POSSIBILITY THAT I HAD SHUT OFF THE FUEL. THE CAPT WAS IN THE PROCESS OF RETURNING TO PIT WHEN I SUGGESTED THAT SINCE WE KNEW FOR A FACT THAT THE ENG HAD SHUT DOWN BECAUSE THE SWITCH WAS IN THE OFF POS; WE RESTART THE ENG AND CONTINUE THE FLT TO DEST. THE CAPT VERY STERNLY STATED THAT 'NO; WE HAVE AN ABNORMAL SIT;' AND THE LIGHT WAS ON (POINTING TO THE OIL PRESSURE LOW/OIL FILTER BYPASS LIGHT). WE WERE RETURNING TO PIT. AS WE LEVELED OFF AT 4000 FT (FOR LNDG AT PIT); THE #2 BUS TIE BREAKER OPENED WITH AN UNDER-EXCITATION FAULT. BECAUSE OF THESE MULTIPLE MALFUNCTIONS. CAPT DECLARED AN EMER AND WE LANDED ON RWY 32 AT PIT.