What Are The Ways To Remove Air From A Steam Sterilizer?
Air removal methods include:
Gravity removal method: When the steam enters the chamber, because the density of the steam is less than the density of the air, the steam first fills the upper area of the chamber. This process compresses air to the bottom of the chamber, forcing it to exit from the exhaust port. The exhaust will stop only when exhaust is complete. The flow of steam is usually controlled by a steam trap or solenoid valve, but it is sometimes controlled by a vent hole and is usually used in combination with a solenoid valve.
Steam pressure pulse method or positive pressure pulse exhaust method: The air in the chamber is diluted and replaced by using a series of pulsed steam. The steam alternately pressurizes the chamber and then decompresses.
Pre-vacuum method: Use a vacuum pump to pump the sterilization chamber to negative pressure, and then fill it with steam to positive pressure. This process is called pre-vacuum. Repeating this process many times, it becomes a pulsating vacuum. That is, the pulsating vacuum is a multiple pre-vacuum. Most large-scale sterilizers use pulsed vacuum to exhaust the air in the chamber.