Inflating valve assembly

An inflating valve assembly comprising:

• a rotary nut unit having opposite upper and lower ends, an inner wall defining an axial hole extending through said upper and lower ends, said inner wall having a threaded wall portion proximate to said upper end, a first wall portion that is located adjacent to said threaded wall portion, that is distal from said upper end and that defines a first diameter, a second wall portion located immediately below said first wall portion and defining a second diameter, wherein said first diameter of said first wall portion and a diameter of the threaded wall portion are greater than said second diameter of said second wall portion, thereby forming a first shoulder between said first and second wall portions, said axial hole defining a third diameter such that said second diameter of said second wall portion is greater than said third diameter and is smaller than said diameter of said threaded wall portion, thereby forming a second shoulder between said second wall portion and said axial hole;
• a valve stem disposed axially within said nut unit, having a lower portion projecting axially and outwardly from said lower end of said nut unit and an upper portion received in said second shoulder of said second wall portion, said valve stem further having an axial inflating hole extending through said upper and lower portions and in spatial communication with said axial hole in said nut unit, and an outer diameter smaller than said third diameter of said axial hole in said nut unit, said upper portion of said valve stem further having a head part formed with first and second flanges projecting radially and outwardly therefrom and cooperatively defining a ring-reception recess therebetween, said first and second flanges cooperatively defining another outer diameter that is greater than said third diameter but smaller than said second diameter of said second wall portion;
• and
• a leak-proof ring sleeved around said ring-reception recess in said head part in such a manner to abut hermetically against said second wall portion, thereby providing an air-proof effect between said leak-proof ring and said second wall portion.