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These are reasons for fusing of safety valve:
1. If there is less water there are chances of the cooker boiling dry. In such a situation, the temperature and pressure inside the cooker rise and cause the safety valve to fuse.
2. When the vent tube is blocked, there is no outlet for steam, thus the pressure inside increases beyond the normal level causing the safety valve to fuse.
3. If cooker is used on a larger flame than required such as if a baby series cooker having a small base is used on a large burner of a gas stove, the flame will extend to the sides of the cooker, thereby overheating the cooker and fusing the safety valve.
4. Continuing cooking on high heat and not reducing heat after cooker reaches full operating pressure.