Can I reduce the number of holes in steam cooker?

Question

I has a steam cooker that has 3 vent holes on top, what is the relationship if I reduce the number of hole to 1, the whole idea is I don't want to waste the energy but I also do not want the danger of pressure cooker, can I improve the steam process to make it most efficient?

Answer 1

maybe put foil over the holes

Answer 2

the pressure needed for the cooker is depending on certain facts but you can better use no pressure cooker if you will be energy friendly