The Protected Valves Model Container is a mechanical filtering system requiring no
maintenance. Its correct functioning can be controlled by inserting a tip in the suitable hole in the centre of the valve bottom. The three working position of the valve during and after sterilization are shown inthe drawing.
Before sterilization the valve is in state of rest.
During the vacuum stage depression makes the valve open completely, so that air escapes from the container.
Afterwards the valve closes, and the second valve opens; in this stage steam enters and the sterilization stage starts.
At the end of the cycle the valve closes tightly in order to maintain the container load sterile.