[Vaaj]

I have a problem in simulating compressed air flow from one container to another container connected through a tube.

At the end of the container which has compressed air at 21 bar(a) pressure there is a valve. It is open for 45 milliseconds and closed after that time.

I could not find help to simulate this on/off valve. I am not worried about the valve motion but the flow has to stop after 45ms.

I tried to simplify the approach by giving mass flow inlet without the compressed air container through the pipe, but the actual physics could not be captured as there are many assumptions to get the mass flow.

How to stop the flow from the pressurized container after 45 ms?
Are there any other strategy which would capture all the physics and still solve the problem?