Inflation stem with blow-off valve to prevent overinflation

An inflation stem, comprising:

• an inflation valve, that is biased to a closed position by the pressure of fluid inside an inflatable object;
• a valve actuating pin, that when depressed by a filling device, forces the inflation valve open, and simultaneously opens both a fill chamber through which the fluid flows into the inflatable object and a blow-off chamber, said fill chamber and said blow-off chamber being isolated from one another;
• a blow-off chamber intake that is substantially separated from a fill chamber exit, and enables the pressure within the blow-off chamber to remain the same as the general pressure inside the inflatable object;
• and
• a blow-off valve biased to a closed position, but being forced open when the pressure within the blow-off chamber exceeds a predetermined pressure.

An inflation method, comprising the steps of:

• attaching an inflation valve to an inflatable object, said inflation valve being biased to a closed position by the pressure of fluid inside an inflatable object;
• depressing a valve actuating pin by a filling device, thus forcing the inflation valve open, and simultaneously opening both a fill chamber through which the fluid flows into the inflatable object and a blow-off chamber, said fill chamber and said blow-off chamber being isolated from one another;
• enabling the pressure within the blow-off chamber to remain the same as the general pressure inside the inflatable object, by means of a blow-off chamber intake that is substantially separated from a fill chamber exit;
• and
• preventing overinflation by means of a blow-off valve biased to a closed position, that is forced open when the pressure within the blow-off chamber exceeds a predetermined pressure.