WHILE CUTTING WITH AN OXYGEN/ACETYLENE TORCH, A HOLE IN THE OXYGEN LINE CAUGHT EE'S RT GLOVE ON FIRE, RESULTING IN 2ND & 3RD DEGREE BURNS TO THE PALM OF HIS RT HAND. EE'S GLOVES WERE CLOTH, WE T WITH WATER, & HAD SOME OILY RESIDUE. FURTHER INVESTIGATION FOUND THE OXYGEN CHECK VALVE NOT FUNCTIONING PROPERLY, MAKING A BACK FEED OF OXYGEN POSSIBLE.